0001133421-21-000006 | 10-K | XBRL Viewer

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Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Dec. 31, 2020	Jan. 25, 2021	Jun. 30, 2020
Document and Entity Information [Abstract]
Document Type	10-K
Document Fiscal Period Focus	FY
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Amendment Flag	false
Document Fiscal Year Focus	2020
Current Fiscal Year End Date	--12-31
Entity File Number	1-16411
Entity Registrant Name	NORTHROP GRUMMAN CORP /DE/
Entity Central Index Key	0001133421
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	80-0640649
Entity Address, Address Line One	2980 Fairview Park Drive
Entity Address, City or Town	Falls Church,
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	22042
City Area Code	703
Local Phone Number	280-2900
Title of 12(b) Security	Common Stock
Trading Symbol	NOC
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 51.2
Entity Common Stock, Shares Outstanding		166,718,384
Documents Incorporated by Reference	Portions of Northrop Grumman Corporation’s Proxy Statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A for the 2021 Annual Meeting of Shareholders are incorporated by reference in Part III of this Form 10-K.

Consolidated Statements of Earnings and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 36,799	$ 33,841	$ 30,095
Operating costs and expenses
General and administrative expenses	3,413	3,290	3,011
Operating income	4,065	3,969	3,780
Other (expense) income
Interest expense	(593)	(528)	(562)
FAS (non-service) pension benefit	1,198	800	1,049
Mark-to-market pension and OPB expense	(1,034)	(1,800)	(655)
Other, net	92	107	130
Earnings before income taxes	3,728	2,548	3,742
Federal and foreign income tax expense	539	300	513
Net earnings	$ 3,189	$ 2,248	$ 3,229
Basic earnings per share
Basic earnings per share	$ 19.08	$ 13.28	$ 18.59
Weighted-average common shares outstanding, in millions	167.1	169.3	173.7
Diluted earnings per share
Diluted earnings per share	$ 19.03	$ 13.22	$ 18.49
Weighted-average diluted shares outstanding, in millions	167.6	170.0	174.6
Net earnings (from above)	$ 3,189	$ 2,248	$ 3,229
Other comprehensive loss
Change in unamortized prior service credit, net of tax expense of $14 in 2020, $15 in 2019 and $19 in 2018	(41)	(47)	(60)
Change in cumulative translation adjustment and other, net	10	2	(14)
Other comprehensive loss, net of tax	(31)	(45)	(74)
Comprehensive income	3,158	2,203	3,155
Product [Member]
Cost of Goods and Services Sold	21,559	18,675	15,785
Revenues	27,015	23,852	20,469
Service [Member]
Cost of Goods and Services Sold	7,762	7,907	7,519
Revenues	$ 9,784	$ 9,989	$ 9,626

Consolidated Statements of Earnings and Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Tax expense on the change in unamortized prior service credits	$ 14	$ 15	$ 19

Consolidated Statements of Financial Position - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 4,907	$ 2,245
Accounts receivable, net	1,501	1,326
Unbilled receivables, net	5,140	5,334
Inventoried costs, net	759	783
Prepaid expenses and other current assets	1,402	997
Assets of disposal group held for sale	1,635	0
Total current assets	15,344	10,685
Property, plant and equipment, net of accumulated depreciation of $6,335 for 2020 and $5,850 for 2019	7,071	6,912
Operating lease right-of-use assets	1,533	1,511
Goodwill	17,518	18,708
Intangible assets, net	783	1,040
Deferred tax assets	311	508
Other non-current assets	1,909	1,725
Total assets	44,469	41,089
Liabilities
Trade accounts payable	1,806	2,226
Accrued employee compensation	1,997	1,865
Advance payments and billings in excess of costs incurred	2,517	2,237
Other current liabilities	3,002	3,106
Liabilities of disposal group held for sale	258	0
Total current liabilities	9,580	9,434
Long-term debt, net of current portion of $742 for 2020 and $1,109 for 2019	14,261	12,770
Pension and other postretirement benefit plan liabilities	6,498	6,979
Operating lease liabilities	1,343	1,308
Other non-current liabilities	2,208	1,779
Total liabilities	33,890	32,270
Commitments and contingencies (Note 12)
Shareholders’ equity
Preferred stock, $1 par value; 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $1 par value; 800,000,000 shares authorized; issued and outstanding: 2020—166,717,179 and 2019—167,848,424	167	168
Paid-in capital	58	0
Retained earnings	10,482	8,748
Accumulated other comprehensive loss	(128)	(97)
Total shareholders’ equity	10,579	8,819
Total liabilities and shareholders’ equity	$ 44,469	$ 41,089

Consolidated Statements of Financial Position (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accumulated depreciation	$ 6,335	$ 5,850
Long-term Debt, Current Maturities	$ 742	$ 1,109
Preferred Stock, par value	$ 1	$ 1
Preferred Stock, shares authorized	10,000,000	10,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	800,000,000	800,000,000
Common stock, shares issued	166,717,179	167,848,424
Common stock, shares outstanding	166,717,179	167,848,424

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net earnings	$ 3,189	$ 2,248	$ 3,229
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	1,267	1,265	800
Mark-to-market pension and OPB expense	1,034	1,800	655
Stock-based compensation	90	127	86
Deferred income taxes	210	(509)	234
Changes in assets and liabilities:
Accounts receivable, net	(285)	122	202
Unbilled receivables, net	160	(335)	(297)
Inventoried costs, net	18	(135)	(37)
Prepaid expenses and other assets	(147)	(78)	(56)
Accounts payable and other liabilities	719	617	381
Income taxes payable, net	(238)	(63)	(258)
Retiree benefits	(1,678)	(703)	(1,083)
Other, net	(34)	(59)	(29)
Net cash provided by operating activities	4,305	4,297	3,827
Investing activities
Acquisition of Orbital ATK, net of cash acquired	0	0	(7,657)
Capital expenditures	(1,420)	(1,264)	(1,249)
Proceeds from Sale of Equipment to a Customer	205	0	0
Other investing activities, net	4	57	28
Net cash used in investing activities	(1,211)	(1,207)	(8,878)
Financing activities
Payments of long-term debt	(1,027)	(500)	(2,276)
Net proceeds from issuance of long-term debt	2,239	0	0
Payments to credit facilities	(78)	(31)	(320)
Net (repayments of) borrowings on commercial paper	0	(198)	198
Common stock repurchases	(490)	(744)	(1,263)
Cash dividends paid	(953)	(880)	(821)
Payments of employee taxes withheld from share-based awards	(66)	(65)	(85)
Other financing activities, net	(57)	(6)	(28)
Net cash used in financing activities	(432)	(2,424)	(4,595)
Increase (decrease) in cash and cash equivalents	2,662	666	(9,646)
Cash and cash equivalents, beginning of year	2,245	1,579	11,225
Cash and cash equivalents, end of year	$ 4,907	$ 2,245	$ 1,579

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Common stock	Paid-in capital	Retained earnings	Accumulated other comprehensive loss
Beginning of year at Dec. 31, 2017		$ 174	$ 44	$ 6,913	$ 1
Impact from adoption of ASU 2018-02 and ASU 2016-01				(21)	21
Common stock repurchased		(4)	(34)	(1,225)
Shares issued for employee stock awards and options		1	(10)	(6)
Other	$ 0		0
Net earnings	3,229			3,229
Dividends declared				(822)
Other comprehensive loss, net of tax	(74)				(74)
End of year at Dec. 31, 2018	$ 8,187	171	0	8,068	(52)
Cash dividends declared per share	$ 4.70
Impact from adoption of ASU 2018-02 and ASU 2016-01				0	0
Common stock repurchased		(3)	0	(751)
Shares issued for employee stock awards and options		0	0	63
Other	$ 0		0
Net earnings	2,248			2,248
Dividends declared				(880)
Other comprehensive loss, net of tax	(45)				(45)
End of year at Dec. 31, 2019	$ 8,819	168	0	8,748	(97)
Cash dividends declared per share	$ 5.16
Impact from adoption of ASU 2018-02 and ASU 2016-01				0	0
Common stock repurchased		(1)	0	(479)
Shares issued for employee stock awards and options		0	63	(36)
Other	$ 11		(5)
Net earnings	3,189			3,189
Dividends declared				(951)
Other comprehensive loss, net of tax	(31)				(31)
End of year at Dec. 31, 2020	$ 10,579	$ 167	$ 58	$ 10,482	$ (128)
Cash dividends declared per share	$ 5.67

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

+ Details

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References + Details

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Significant Accounting Policies

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

Northrop Grumman Corporation (herein referred to as “Northrop Grumman,” the “company,” “we,” “us,” or “our”) is a leading global aerospace and defense company. We use our broad portfolio of capabilities and technologies to create and deliver innovative platforms, systems and solutions in space; manned and autonomous airborne systems, including strike; strategic deterrence systems; hypersonics; missile defense; weapons systems; cyber; command, control, communications and computers, intelligence, surveillance and reconnaissance (C4ISR); and logistics and modernization. We participate in many high-priority defense and government programs in the United States (U.S.) and abroad. We conduct most of our business with the U.S. government, principally the Department of Defense (DoD) and intelligence community. We also conduct business with foreign, state and local governments, as well as commercial customers.

Effective January 1, 2020, the company reorganized its sectors to better align the company’s broad portfolio to serve its customers’ needs. At December 31, 2020, the company was aligned in four operating sectors, which also comprise our reportable segments: Aeronautics Systems, Defense Systems, Mission Systems and Space Systems.

On June 6, 2018 (the “Merger date”), the company completed its previously announced acquisition of Orbital ATK, Inc. (“Orbital ATK”) (the “Merger”). On the Merger date, Orbital ATK became a wholly-owned subsidiary of the company and its name was changed to Northrop Grumman Innovation Systems, Inc., which we established as a new, fourth business sector (“Innovation Systems”). The operating results of legacy Innovation Systems subsequent to the Merger date have been included in the company’s consolidated results of operations and, upon our January 1, 2020 sector realignment, are reflected in the Space Systems, Defense Systems and Aeronautics Systems sectors. See Note 2 for further information regarding the Merger.

Principles of Consolidation

The consolidated financial statements include the accounts of Northrop Grumman and its subsidiaries and joint ventures or other investments for which we consolidate the financial results. Intercompany accounts, transactions and profits are eliminated in consolidation. Investments in equity securities and joint ventures where the company has significant influence, but not control, are accounted for using the equity method.

Basis of Presentation

Beginning in the second quarter of 2020, the company no longer considers certain unallowable costs and environmental matters that are principally managed at the corporate office as part of management’s evaluation of segment operating performance. As a result, certain unallowable compensation and other costs, which were previously included in segment operating results, are now reported in Unallocated corporate expense within operating income. In addition, certain accrued and deferred costs, as well as unallowable costs, if any, associated with certain environmental matters that were previously reflected in segment assets and operating results are now reflected in corporate assets and Unallocated corporate expense within operating income. The impact of these changes are reflected in the amounts in this Form 10-K. See Part II, Item 5 in the Quarterly Report on Form 10-Q for the quarter ended June 30, 2020 for further information regarding the impact of these changes on the company’s prior period segment operating income.

On December 7, 2020, we entered into a definitive agreement to sell our IT and mission support services business for $3.4 billion in cash. The IT and mission support services business is comprised of the majority of the Information Solutions and Services (IS&S) division of Defense Systems (excluding our Vinnell Arabia business); select cyber, intelligence and missions support programs, which are part of the Cyber and Intelligence Mission Solutions (CIMS) division of Mission Systems; and the Space Technical Services business unit of Space Systems. The assets and liabilities of the IT and mission support services business were classified as held for sale in the consolidated statement of financial position as of December 31, 2020 and no impairment losses were recognized in the consolidated statement of earnings and comprehensive income for the year ended December 31, 2020. We expect to complete the sale of the IT and mission support services business in the first quarter of 2021, subject to regulatory approvals and customary closing conditions. See Note 2 for further information regarding the divestiture and Note 8 for the allocation of goodwill to the divestiture.

Accounting Estimates

The company’s consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP” or “FAS”). The preparation thereof requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and the disclosure of

contingencies at the date of the financial statements, as well as the reported amounts of sales and expenses during the reporting period. Estimates have been prepared using the most current and best available information; however, actual results could differ materially from those estimates.

Revenue Recognition

The majority of our sales are derived from long-term contracts with the U.S. government for the development or production of goods, the provision of services, or a combination of both. The company classifies sales as product or service based on the predominant attributes of each performance obligation.

The company recognizes revenue for each separately identifiable performance obligation in a contract representing a promise to transfer a distinct good or service to a customer. In most cases, goods and services provided under the company’s contracts are accounted for as single performance obligations due to the complex and integrated nature of our products and services. These contracts generally require significant integration of a group of goods and/or services to deliver a combined output. In some contracts, the company provides multiple distinct goods or services to a customer, most commonly when a contract covers multiple phases of the product life cycle (e.g., development, production, sustainment, etc.). In those cases, the company accounts for the distinct contract deliverables as separate performance obligations and allocates the transaction price to each performance obligation based on its relative standalone selling price, which is generally estimated using cost plus a reasonable margin. Warranties are provided on certain contracts, but do not typically provide for services beyond standard assurances and are therefore not considered to be separate performance obligations. Assets recognized from the costs to obtain or fulfill a contract are not material.

Contracts are often modified for changes in contract specifications or requirements, which may result in scope and/or price changes. Most of the company’s contract modifications are for goods or services that are not distinct in the context of the contract and are therefore accounted for as part of the original performance obligation through a cumulative estimate-at-completion (EAC) adjustment.

The company recognizes revenue as control is transferred to the customer, either over time or at a point in time. In general, our U.S. government contracts contain termination for convenience and/or other clauses that generally provide the customer rights to goods produced and/or in-process. Similarly, our non-U.S. government contracts generally contain contractual termination clauses or entitle the company to payment for work performed to date for goods and services that do not have an alternative use. For most of our contracts, control is effectively transferred during the period of performance, so we generally recognize revenue over time using the cost-to-cost method (cost incurred relative to total cost estimated at completion). The company believes this represents the most appropriate measurement towards satisfaction of its performance obligations. Revenue for contracts in which the control of goods produced does not transfer until delivery to the customer is recognized at a point in time (i.e., typically upon delivery).

Contract Estimates

Use of the cost-to-cost method requires us to make reasonably dependable estimates regarding the revenue and cost associated with the design, manufacture and delivery of our products and services. The company estimates profit on these contracts as the difference between total estimated sales and total estimated cost at completion and recognizes that profit as costs are incurred. Significant judgment is used to estimate total sales and cost at completion.

Contract sales may include estimates of variable consideration, including cost or performance incentives (such as award and incentive fees), contract claims and requests for equitable adjustment (REAs). Variable consideration is included in total estimated sales to the extent it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. We estimate variable consideration as the most likely amount to which we expect to be entitled.

We recognize changes in estimated contract sales or costs and the resulting changes in contract profit on a cumulative basis. Cumulative EAC adjustments represent the cumulative effect of the changes on current and prior periods; sales and operating margins in future periods are recognized as if the revised estimates had been used since contract inception. If it is determined that a loss is expected to result on an individual performance obligation, the entire amount of the estimable future loss, including an allocation of general and administrative (G&A) costs, is charged against income in the period the loss is identified.

The following table presents the effect of aggregate net EAC adjustments:


	Year Ended December 31
$ in millions, except per share data	2020		2019		2018
Revenue	$	504	$	538	$	631
Operating income	466		480		577
Net earnings(1)	368		379		456
Diluted earnings per share(1)	2.20		2.23		2.61

(1)Based on a 21% federal statutory tax rate.

EAC adjustments on a single performance obligation can have a material effect on the company’s financial statements. When such adjustments occur, we generally disclose the nature, underlying conditions and financial impact of the adjustments. No such adjustments were material to the financial statements during the years ended December 31, 2020 and 2019. During the second quarter of 2018, the company recognized $69 million of favorable EAC adjustments on multiple restricted programs at Aeronautics Systems.

Backlog

Backlog represents the future sales we expect to recognize on firm orders received by the company and is equivalent to the company’s remaining performance obligations at the end of each period. It comprises both funded backlog (firm orders for which funding is authorized and appropriated) and unfunded backlog. Unexercised contract options and indefinite delivery indefinite quantity (IDIQ) contracts are not included in backlog until the time an option or IDIQ task order is exercised or awarded.

Company backlog as of December 31, 2020 was $81.0 billion. We expect to recognize approximately 40 percent and 60 percent of our December 31, 2020 backlog as revenue over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter.

Contract Assets and Liabilities

For each of the company’s contracts, the timing of revenue recognition, customer billings, and cash collections results in a net contract asset or liability at the end of each reporting period. Fixed-price contracts are typically billed to the customer either using progress payments, whereby amounts are billed monthly as costs are incurred or work is completed, or performance based payments, which are based upon the achievement of specific, measurable events or accomplishments defined and valued at contract inception. Cost-type contracts are typically billed to the customer on a monthly or semi-monthly basis.

Contract assets are equivalent to and reflected as Unbilled receivables in the consolidated statements of financial position and are primarily related to long-term contracts where revenue recognized under the cost-to-cost method exceeds amounts billed to customers. Unbilled receivables are classified as current assets and, in accordance with industry practice, include amounts that may be billed and collected beyond one year due to the long-cycle nature of many of our contracts. Accumulated contract costs in unbilled receivables include costs such as direct production costs, factory and engineering overhead, production tooling costs, and allowable G&A. Unbilled receivables also include certain estimates of variable consideration described above. These contract assets are not considered a significant financing component of the company’s contracts as the payment terms are intended to protect the customer in the event the company does not perform on its obligations under the contract.

Contract liabilities are equivalent to and reflected as Advance payments and billings in excess of costs incurred in the consolidated statements of financial position. Certain customers make advance payments prior to the company’s satisfaction of its obligations on the contract. These amounts are recorded as contract liabilities until such obligations are satisfied, either over time as costs are incurred or at a point in time when deliveries are made. Contract liabilities are not a significant financing component as they are generally utilized to pay for contract costs within a one-year period or are used to ensure the customer meets contractual requirements.

Net contract assets are as follows:


$ in millions	December 31, 2020		December 31, 2019		$ Change		% Change
Unbilled receivables, net	$	5,140	$	5,334	$	(194)	(4)	%
Advance payments and amounts in excess of costs incurred	(2,517)		(2,237)		(280)		13	%
Net contract assets	$	2,623	$	3,097	$	(474)	(15)	%

The change in the balances of the company’s contract assets and liabilities primarily results from timing differences between revenue recognition and customer billings and/or payments. Net contract assets as of December 31, 2020 decreased 15 percent from the prior year, due to an increase in Advance payments and amounts in excess of costs incurred as well as lower Unbilled receivables, net. Higher Advance payments and amounts in excess of costs incurred were driven by Mission Systems and Space Systems. Lower Unbilled receivables, net were driven by Defense Systems and were partially offset by higher Unbilled receivables, net at Aeronautics Systems and Space Systems.

The amount of revenue recognized for the years ended December 31, 2020, 2019 and 2018 that was included in the contract liability balance at the beginning of each year was $1.6 billion, $1.3 billion and $1.3 billion, respectively.

Disaggregation of Revenue

See Note 16 for information regarding the company’s sales by customer type, contract type and geographic region for each of our segments. We believe those categories best depict how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors.

General and Administrative Expenses

In accordance with the regulations that govern cost accounting requirements for government contracts, most general management and corporate expenses incurred at the segment and corporate locations are considered allowable and allocable costs. Allowable and allocable G&A costs, including independent research and development (IR&D) and bid and proposal (B&P) costs, are allocated on a systematic basis to contracts in progress and are included as a component of total estimated contract costs.

Research and Development

Company-sponsored research and development activities primarily include efforts related to government programs. Company-sponsored IR&D expenses totaled $1.1 billion, $953 million and $764 million in 2020, 2019 and 2018, respectively, which represented 2.9 percent, 2.8 percent and 2.5 percent of total sales, respectively. Customer-funded research and development activities are charged directly to the related contracts.

Income Taxes

Provisions for federal and foreign income taxes are calculated on reported earnings before income taxes based on current tax law and include the cumulative effect of any changes in tax rates from those used previously in determining deferred tax assets and liabilities. Such provisions differ from the amounts currently payable because certain items of income and expense are recognized in different periods for financial reporting purposes than for income tax purposes. The company recognizes federal and foreign interest accrued related to unrecognized tax benefits in income tax expense. Federal tax penalties are recognized as a component of income tax expense.

In accordance with the regulations that govern cost accounting requirements for government contracts, current state and local income and franchise taxes are generally considered allowable and allocable costs and, consistent with industry practice, are recorded in operating costs and expenses. The company generally recognizes changes in deferred state taxes and unrecognized state tax benefits in unallocated corporate expenses.

Uncertain tax positions reflect the company’s expected treatment of tax positions taken in a filed tax return, or planned to be taken in a future tax return or claim, which have not been reflected in measuring income tax expense or taxes payable for financial reporting purposes. Until these positions are sustained by the taxing authorities or the statute of limitations concerning such issues lapses, the company does not generally recognize the tax benefits resulting from such positions and reports the tax effects as a liability for uncertain tax positions in its consolidated statements of financial position.

Cash and Cash Equivalents

Cash and cash equivalents are comprised of cash in banks and highly liquid instruments with original maturities of three months or less, primarily consisting of bank time deposits and investments in institutional money market funds. Cash in bank accounts often exceeds federally insured limits.

Fair Value of Financial Instruments

The company measures the fair value of its financial instruments using observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect internal market assumptions.

These two types of inputs create the following fair value hierarchy:

Level 1 - Quoted prices for identical instruments in active markets.

Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.

Level 3 - Significant inputs to the valuation model are unobservable.

The company holds a portfolio of marketable securities consisting of securities to partially fund non-qualified employee benefit plans. A portion of these securities are held in common/collective trust funds and are measured at fair value using net asset value (NAV) per share as a practical expedient. Marketable securities accounted for as trading are recorded at fair value on a recurring basis and are included in Other non-current assets in the consolidated statements of financial position. Changes in unrealized gains and losses on trading securities are included in Other, net in the consolidated statements of earnings and comprehensive income. Investments in held-to-maturity instruments with original maturities greater than three months are recorded at amortized cost.

Derivative financial instruments are recognized as assets or liabilities in the financial statements and measured at fair value on a recurring basis. Changes in the fair value of derivative financial instruments that are designated as fair value hedges are recorded in net earnings, while the changes in the fair value of derivative financial instruments that are designated as cash flow hedges are recorded as a component of other comprehensive income until settlement. For derivative financial instruments not designated as hedging instruments, gains or losses resulting from changes in the fair value are reported in Other, net in the consolidated statements of earnings and comprehensive income.

The company uses derivative financial instruments to manage its exposure to foreign currency exchange risk related to receipts from customers and payments to suppliers denominated in foreign currencies (i.e., foreign currency forward contracts). For foreign currency forward contracts, where model-derived valuations are appropriate, the company utilizes the income approach to determine the fair value and uses the applicable London Interbank Offered Rate (LIBOR) swap rates.

The company does not use derivative financial instruments for trading or speculative purposes, nor does it use leveraged financial instruments. Credit risk related to derivative financial instruments is considered minimal and is managed through the use of multiple counterparties with high credit standards and periodic settlements of positions, as well as by entering into master netting agreements with most of our counterparties.

Inventoried Costs

Inventoried costs generally comprise costs associated with unsatisfied performance obligations on contracts accounted for using point in time revenue recognition, costs incurred in excess of existing contract requirements or funding that are probable of recovery and other accrued contract costs that are expected to be recoverable when allocated to specific contracts. Product inventory primarily consists of raw materials and is stated at the lower of cost or net realizable value, generally using the average cost method.

Accumulated contract costs in inventoried costs include costs such as direct production costs, factory and engineering overhead, production tooling costs, and allowable G&A. Inventoried costs are classified as current assets and, in accordance with industry practice, include amounts related to contracts having production cycles longer than one year.

Cash Surrender Value of Life Insurance Policies

The company maintains whole life insurance policies on a group of executives, which are recorded at their cash surrender value as determined by the insurance carrier. The company also has split-dollar life insurance policies on former officers and executives from acquired businesses, which are recorded at the lesser of their cash surrender value or premiums paid. These policies are utilized as a partial funding source for deferred compensation and other non-qualified employee retirement plans. As of December 31, 2020 and 2019, the carrying values associated with these policies were $419 million and $380 million, respectively, and are recorded in Other non-current assets in the consolidated statements of financial position.

Property, Plant and Equipment

Property, plant and equipment are depreciated over the estimated useful lives of individual assets. Most assets are depreciated using declining-balance methods, with the remainder using the straight-line method. Depreciation expense is generally recorded in the same segment where the related assets are held. However, the additional depreciation expense related to the step-up in fair value of property, plant and equipment acquired through business combinations is recorded in unallocated corporate expense within operating income as such depreciation is not considered part of management’s evaluation of segment operating performance. Major classes of property, plant and equipment and their useful lives are as follows:


		December 31
Useful life in years, $ in millions	Useful Life	2020		2019
Land and land improvements	Up to 40(1)	$	628	$	619
Buildings and improvements	Up to 45	2,762		2,575
Machinery and other equipment	Up to 20	7,206		6,997
Capitalized software costs	3-5	602		606
Leasehold improvements	Lease Term(2)	2,208		1,965
Property, plant and equipment, at cost		13,406		12,762
Accumulated depreciation		(6,335)		(5,850)
Property, plant and equipment, net		$	7,071	$	6,912

(1)Land is not a depreciable asset.

(2)Leasehold improvements are depreciated over the shorter of the useful life of the asset or lease term.

During the fourth quarter of 2020, the company completed a sale of equipment to a customer on a restricted Aeronautics Systems program for $444 million. The company previously intended to use the equipment for internal purposes so we recognized the acquisition costs as capital expenditures and included the equipment in property, plant and equipment. As we regularly sell this type of equipment to customers in the ordinary course of business, we recorded the sale as a revenue transaction and included the net book value of the equipment in Operating costs and expenses. We recognized operating income in connection with the sale at a margin rate that was dilutive to the Aeronautics Systems margin rate. Although we generally classify proceeds from revenue transactions as cash inflows from operating activities, we recognized the proceeds from this transaction as cash inflows from investing activities, consistent with our prior recognition of the cost to acquire the equipment as capital expenditures. The company received cash payments of $205 million related to the equipment sale during 2020, and included it in Proceeds from sale of equipment to a customer in the consolidated statement of cash flows. The remaining $239 million was included in non-cash investing activities at December 31, 2020 and is expected to be collected in 2021.

Non-cash investing activities also include capital expenditures incurred but not yet paid of $72 million, $166 million and $185 million as of December 31, 2020, 2019 and 2018, respectively.

Goodwill and Other Purchased Intangible Assets

The company tests goodwill for impairment at least annually as of December 31, or when an indicator of potential impairment exists. When performing the goodwill impairment test, the company uses a discounted cash flow approach corroborated by comparative market multiples, where appropriate, to determine the fair value of its reporting units.

Goodwill and other purchased intangible asset balances are included in the identifiable assets of their assigned business segment. However, the company includes the amortization of other purchased intangible assets in unallocated corporate expense within operating income as such amortization is not considered part of management’s evaluation of segment operating performance. The company’s customer-related intangible assets are generally amortized over their respective useful lives based on the pattern in which the future economic benefits of the intangible assets are expected to be consumed. Other intangible assets are generally amortized on a straight-line basis over their estimated useful lives.

Leases

The company leases certain buildings, land and equipment. Under ASC 842, at contract inception we determine whether a contract is or contains a lease and whether the lease should be classified as an operating or finance lease.

Operating lease balances are included in Operating lease right-of-use assets, Other current liabilities, and Operating lease liabilities in our consolidated statements of financial position.

The company recognizes operating lease right-of-use assets and operating lease liabilities based on the present value of the future minimum lease payments over the lease term at commencement date. We use our incremental borrowing rate based on the information available at commencement date to determine the present value of future payments and the appropriate lease classification. Many of our leases include renewal options aligned with our contract terms. We define the initial lease term to include renewal options determined to be reasonably certain. We do not recognize a right-of-use asset and a lease liability for leases with an initial term of 12 months or less; we recognize lease expense for these leases on a straight-line basis over the lease term. We elected the practical expedient to not separate lease components from nonlease components and applied that practical expedient to all material classes of leased assets.

Many of the company’s real property lease agreements contain incentives for tenant improvements, rent holidays or rent escalation clauses. For tenant improvement incentives received, if the incentive is determined to be a leasehold improvement owned by the lessee, the company generally records the incentives as a reduction to the right-of-use asset, which reduces rent expense over the lease term. For rent holidays and rent escalation clauses during the lease term, the company records rental expense on a straight-line basis over the term of the lease. For these lease incentives, the company uses the date of initial possession as the commencement date, which is generally when the company is given the right of access to the space and begins to make improvements in preparation for intended use.

Finance leases are not material to our consolidated financial statements and the company is not a lessor in any material arrangements. We do not have any material restrictions or covenants in our lease agreements, sale-leaseback transactions, land easements or residual value guarantees.

Litigation, Commitments and Contingencies

We accrue for litigation, commitments and contingencies when management, after considering the facts and circumstances of each matter as then known to management, has determined it is probable a liability will be found to have been incurred and the amount of the loss can be reasonably estimated. When only a range of amounts is reasonably estimable and no amount within the range is more likely than another, the low end of the range is recorded. Legal fees are expensed as incurred. Due to the inherent uncertainties surrounding gain contingencies, we generally do not recognize potential gains until realized.

Environmental Costs

We accrue for environmental liabilities when management determines that, based on the facts and circumstances known to the company, it is probable the company will incur costs to address environmental impacts and the costs are reasonably estimable. When only a range of amounts is reasonably estimable and no amount within the range is more probable than another, we record the low end of the range. The company typically projects environmental costs for up to 30 years, records environmental liabilities on an undiscounted basis, and excludes asset retirement obligations and certain legal costs. At sites involving multiple parties, we accrue environmental liabilities based upon our expected share of liability, taking into account the financial viability of other liable parties.

Retirement Benefits

The company sponsors various defined benefit pension plans and defined contribution retirement plans covering substantially all of its employees. In most cases, our defined contribution plans provide for a company match of employee contributions. The company also provides postretirement benefits other than pensions to eligible retirees and qualifying dependents, consisting principally of health care and life insurance benefits.

The liabilities, unamortized prior service credits and annual income or expense of the company’s defined benefit pension and other postretirement benefit plans (OPB) are determined using methodologies that involve several actuarial assumptions.

Because U.S. government regulations provide for the costs of pension and OPB plans to be charged to our contracts in accordance with the Federal Acquisition Regulation (FAR) and the related U.S. Government Cost Accounting Standards (CAS) that govern such plans, we calculate retiree benefit plan costs under both FAS and CAS methods. While both FAS and CAS recognize a normal service cost component in measuring periodic pension cost, there are differences in the way the components of annual pension costs are calculated under each method. Measuring plan obligations under FAS and CAS includes different assumptions and models, such as in estimating returns on plan assets, calculating interest expense and the periods over which gains/losses related to pension assets and actuarial changes are recognized. As a result, annual retiree benefit plan expense amounts for FAS are different from the amounts for CAS in any given reporting period even though the ultimate cost of providing benefits over the life of

the plans is the same under either method. CAS retiree benefit plan costs are charged to contracts and are included in segment operating income, and the difference between the service cost component of FAS expense and total CAS expense is recorded in operating income at the consolidated company level. Not all net periodic pension expense is recognized in net earnings in the year incurred because it is allocated as production costs and a portion remains in inventory at the end of a reporting period.

Actuarial gains and losses are immediately recognized in net periodic benefit cost for FAS through Mark-to-market pension and OPB (“MTM”) expense upon annual remeasurement in the fourth quarter, or on an interim basis as triggering events warrant remeasurement. Prior service credits are recognized as a component of Accumulated other comprehensive loss and amortized into earnings in future periods.

Stock Compensation

The company’s stock compensation plans are classified as equity plans and compensation expense is generally recognized over the vesting period of stock awards (typically three years), net of estimated forfeitures. The company issues stock awards in the form of restricted performance stock rights and restricted stock rights. The fair value of stock awards is determined based on the closing market price of the company’s common stock on the grant date. At each reporting date, the number of shares used to calculate compensation expense and diluted earnings per share is adjusted to reflect the number ultimately expected to vest.

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows:


	December 31
$ in millions	2020		2019
Unamortized prior service credit, net of tax expense of $3 for 2020 and $17 for 2019	$	10	$	51
Cumulative translation adjustment and other, net	(138)		(148)

Total accumulated other comprehensive loss	$	(128)	$	(97)

Related Party Transactions

For all periods presented, the company had no material related party transactions.

Accounting Standards Updates

Accounting standards updates adopted and/or issued, but not effective until after December 31, 2020, are not expected to have a material effect on the company’s consolidated financial position, annual results of operations and/or cash flows.

Commitments and Contingencies Disclosure

12. COMMITMENTS AND CONTINGENCIES

U.S. Government Cost Claims and Contingencies

From time to time, the company is advised of claims by the U.S. government concerning certain potential disallowed costs, plus, at times, penalties and interest. When such findings are presented, the company and U.S. government representatives engage in discussions to enable the company to evaluate the merits of these claims, as well as to assess the amounts being claimed. Where appropriate, provisions are made to reflect the company’s estimated exposure for such potential disallowed costs. Such provisions are reviewed periodically using the most recent information available. The company believes it has adequately reserved for disputed amounts that are probable and reasonably estimable, and that the outcome of any such matters would not have a material adverse effect on its consolidated financial position as of December 31, 2020, or its annual results of operations and/or cash flows.

The U.S. government has raised questions about an interest rate assumption used by the company to determine our CAS pension expense in previous years and in our current forward pricing rate proposal. On June 1, 2020, the government provided written notice that the assumptions the company used during the period 2013-2019 were potentially noncompliant with CAS. We submitted a formal response on July 31, 2020, which we believe demonstrates the appropriateness of the assumptions used. On November 24, 2020, the government replied to the company’s response, disagreeing with our position and requesting additional input. We are engaging further with the government. The sensitivity to changes in interest rate assumptions makes it reasonably possible the outcome of this matter could have a material adverse effect on our financial position, results of operations and/or cash flows, although we are not currently able to estimate a range of any potential loss.

Environmental Matters

The table below summarizes the amount accrued for environmental remediation costs, management’s estimate of the amount of reasonably possible future costs in excess of accrued costs and the deferred costs expected to be recoverable through overhead charges on U.S. government contracts as of December 31, 2020 and 2019:


$ in millions	Accrued Costs(1)(2)		Reasonably Possible Future Costs in excess of Accrued Costs(2)		Deferred Costs(3)
December 31, 2020	$	614	$	346	$	529
December 31, 2019	531		448		436

(1)As of December 31, 2020, $237 million is recorded in Other current liabilities and $377 million is recorded in Other non-current liabilities.

(2)Estimated remediation costs are not discounted to present value. The reasonably possible future costs in excess of accrued costs do not take into consideration amounts expected to be recoverable through overhead charges on U.S. government contracts.

(3)As of December 31, 2020, $210 million is deferred in Prepaid expenses and other current assets and $319 million is deferred in Other non-current assets. These amounts are evaluated for recoverability on a routine basis.

Although management cannot predict whether new information gained as our environmental remediation projects progress, or as changes in facts and circumstances occur, will materially affect the estimated liability accrued, except with respect to Bethpage, we do not anticipate that future remediation expenditures associated with our currently identified projects will have a material adverse effect on the company’s consolidated financial position as of December 31, 2020, or its annual results of operations and/or cash flows.

With respect to Bethpage, as discussed in Note 11, in December 2019, the State of New York issued an Amended Record of Decision, seeking to impose additional remedial requirements beyond those the company previously had been taking; the State also communicated that it was assessing potential natural resource damages. In December

2020, the parties reached a tentative agreement regarding the steps the company will take to implement the State’s Amended Record of Decision and to resolve the certain potential other claims, including for natural resource damages. The State of New York is preparing to file a new consent decree reflecting the agreement and to seek court approval. As discussed in Note 11, the applicable remediation standards and other requirements to which we are subject may continue to change, our costs may increase materially, and those costs may not be fully recoverable.

Financial Arrangements

In the ordinary course of business, the company uses standby letters of credit and guarantees issued by commercial banks and surety bonds issued principally by insurance companies to guarantee the performance on certain obligations. At December 31, 2020, there were $456 million of stand-by letters of credit and guarantees and $94 million of surety bonds outstanding.

Indemnifications

The company has provided indemnifications for certain environmental, income tax and other potential liabilities in connection with certain of its divestitures. The settlement of these liabilities is not expected to have a material adverse effect on the company’s consolidated financial position as of December 31, 2020, or its annual results of operations and/or cash flows.

Acquisition and Dispositions

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

2. ACQUISITIONS AND DISPOSITIONS

Acquisition of Orbital ATK

On June 6, 2018, the company completed its previously announced acquisition of Orbital ATK, by acquiring all of the outstanding shares of Orbital ATK for a purchase price of $7.7 billion in cash. On the Merger date, Orbital ATK became a wholly-owned subsidiary of the company and its name was changed to Northrop Grumman Innovation Systems, Inc. We established Innovation Systems as a new, fourth business sector. Its main products include precision munitions and armaments; tactical missiles and subsystems; ammunition; launch vehicles; space and strategic propulsion systems; aerospace structures; space exploration products; and national security and commercial satellite systems and related components/services. The acquisition was financed with proceeds from the company’s debt financing completed in October 2017 and cash on hand. We believe this acquisition has enabled us to broaden our capabilities and offerings, provide additional innovative solutions to meet our customers’ emerging requirements, create value for shareholders and provide expanded opportunities for our combined employees.

The operating results of legacy Innovation Systems subsequent to the Merger date are included in the company’s consolidated results of operations and reflected in the Space Systems, Defense Systems and Aeronautics Systems sectors. We recognized customer sales of $3.1 billion, operating income of $342 million and net earnings of $273 million for the period from the Merger date to December 31, 2018.

The company recognized $29 million of acquisition-related costs that were expensed as incurred during the year ended December 31, 2018. These costs are included in Product and Service cost in the consolidated statements of earnings and comprehensive income.

Purchase Price Allocation

The acquisition was accounted for as a purchase business combination. As such, the company recorded the assets acquired and liabilities assumed at fair value, with the excess of the purchase price over the fair value of assets acquired and liabilities assumed recorded as goodwill. Determining the fair value of assets acquired and liabilities assumed requires significant judgment, including the amount and timing of expected future cash flows, long-term growth rates and discount rates. In some cases, the company used discounted cash flow analyses, which were based on our best estimate of future sales, earnings and cash flows after considering such factors as general market conditions, customer budgets, existing firm and future orders, changes in working capital, long term business plans and recent operating performance. Use of different estimates and judgments could yield materially different results.

The Merger date fair value of the consideration transferred totaled $7.7 billion in cash, which was comprised of the following:


$ in millions, except per share amounts	Purchase price
Shares of Orbital ATK common stock outstanding as of the Merger date	57,562,152
Cash consideration per share of Orbital ATK common stock	$	134.50
Total purchase price	$	7,742

The following purchase price allocation table presents the company’s final determination of the fair values of assets acquired and liabilities assumed at the Merger date:


$ in millions	As of June 6, 2018
Cash and cash equivalents	$	85
Accounts receivable	596
Unbilled receivables	1,237
Inventoried costs	220
Other current assets	237
Property, plant and equipment	1,509
Goodwill	6,259
Intangible assets	1,525
Other non-current assets	151
Total assets acquired	11,819
Trade accounts payable	(397)
Accrued employee compensation	(158)
Advance payments and billings in excess of costs incurred	(222)
Below market contracts(1)	(151)
Other current liabilities	(412)
Long-term debt	(1,687)
Pension and OPB plan liabilities	(613)
Deferred tax liabilities	(248)
Other non-current liabilities	(189)
Total liabilities assumed	(4,077)
Total purchase price	$	7,742

(1)Included in Other current liabilities in the consolidated statements of financial position.

The following table presents a summary of purchased intangible assets and their related estimated useful lives:


	Fair Value (in millions)		Estimated Useful Life in Years
Customer contracts	$	1,245	9
Commercial customer relationships	280		13
Total customer-related intangible assets	$	1,525

The purchase price allocation resulted in the recognition of $6.3 billion of goodwill, which was allocated to the Space Systems, Defense Systems and Aeronautics Systems sectors. The goodwill recognized is attributable to expected revenue synergies generated by the integration of Northrop Grumman products and technologies with those of legacy Orbital ATK, synergies resulting from the consolidation or elimination of certain costs, and intangible assets that do not qualify for separate recognition, such as the assembled workforce of Orbital ATK. None of the goodwill is expected to be deductible for tax purposes.

Unaudited Supplemental Pro Forma Information

The following table presents unaudited pro forma financial information prepared in accordance with Article 11 of Regulation S-X for the year ended December 31, 2018 and computed as if Orbital ATK had been included in our results as of January 1, 2017:



$ in millions, except per share amounts
Sales	$	32,319
Net earnings	3,417
Diluted earnings per share	19.57

The unaudited supplemental pro forma financial data has been calculated after applying our accounting policies and adjusting the historical results of Orbital ATK with pro forma adjustments, net of tax, that assume the acquisition occurred on January 1, 2017. Significant pro forma adjustments include the following:

1.The elimination of intercompany sales and costs of sales between the company and Orbital ATK of $80 million for the year ended December 31, 2018.

2.The elimination of nonrecurring transaction costs incurred by the company and Orbital ATK in connection with the Merger of $71 million for the year ended December 31, 2018.

3.The recognition of additional depreciation expense, net of removal of historical depreciation expense, of $8 million related to the step-up in fair value of acquired property, plant and equipment for the year ended December 31, 2018.

4.The recognition of additional amortization expense, net of removal of historical amortization expense, of $90 million related to the fair value of acquired intangible assets for the year ended December 31, 2018.

5.The elimination of Orbital ATK’s historical amortization of net actuarial losses and prior service credits and impact of the revised pension and OPB net periodic benefit cost as determined under the company’s plan assumptions of $51 million for the year ended December 31, 2018.

6.The income tax effect on the pro forma adjustments, which was calculated using the 21% federal statutory tax rate in effect in 2018, of $(5) million for the year ended December 31, 2018.

The unaudited pro forma financial information does not reflect the potential realization of revenue synergies or cost savings, nor does it reflect other costs relating to the integration of the two companies. This unaudited pro forma financial information should not be considered indicative of the results that would have actually occurred if the acquisition had been consummated on January 1, 2017, nor are they indicative of future results.

Disposition of IT and Mission Support Services Business

The pretax profit of the IT and mission support services business was $247 million, $245 million and $288 million for the years ended December 31, 2020, 2019 and 2018, respectively.

The carrying amounts of the major classes of assets and liabilities of the IT and mission support services business classified as held for sale as of December 31, 2020 are as follows:


$ in millions
Accounts receivable, net	$	110
Unbilled receivables, net	269
Other current assets	9
Property, plant and equipment	14
Operating lease right-of-use assets	38
Goodwill(1)	1,195

Total assets of disposal group held for sale	$	1,635
Trade accounts payable	(99)
Accrued employee compensation	(59)
Advance payments and billings in excess of costs incurred	(31)

Other current liabilities	(42)
Non-current operating lease liabilities	(27)

Total liabilities of disposal group held for sale	$	(258)

(1) See Note 8 for a summary by reportable segment of Goodwill reclassified to Assets of disposal group held for sale.

Earnings Per Share, Share Repurchases and Dividends on Common Stock

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Share, Share Repurchases and Dividends on Common Stock

3. EARNINGS PER SHARE, SHARE REPURCHASES AND DIVIDENDS ON COMMON STOCK

Basic Earnings Per Share

We calculate basic earnings per share by dividing net earnings by the weighted-average number of shares of common stock outstanding during each period.

Diluted Earnings Per Share

Diluted earnings per share include the dilutive effect of awards granted to employees under stock-based compensation plans. The dilutive effect of these securities totaled 0.5 million, 0.7 million and 0.9 million shares for the years ended December 31, 2020, 2019 and 2018, respectively.

Share Repurchases

On September 16, 2015, the company’s board of directors authorized a share repurchase program of up to $4.0 billion of the company’s common stock (the “2015 Repurchase Program”). Repurchases under the 2015 Repurchase Program commenced in March 2016 and were completed in March 2020.

On December 4, 2018, the company’s board of directors authorized a share repurchase program of up to an additional $3.0 billion in share repurchases of the company’s common stock (the “2018 Repurchase Program”). Repurchases under the 2018 Repurchase Program commenced in March 2020 upon the completion of the company’s 2015 Repurchase Program. We had no repurchases of common stock during the three months ended December 31, 2020. As of December 31, 2020, repurchases under the 2018 Repurchase Program totaled $0.2 billion; $2.8 billion remained under this share repurchase authorization. By its terms, the 2018 Repurchase Program is set to expire when we have used all authorized funds for repurchases.

On January 25, 2021, the company’s board of directors authorized a new share repurchase program of up to an additional $3.0 billion in share repurchases of the company’s common stock (the “2021 Repurchase Program”), bringing the total outstanding authorization up to $5.8 billion. By its terms, repurchases under the 2021 Repurchase Program will commence upon completion of the 2018 Repurchase Program and will expire when we have used all authorized funds for repurchases.

Share repurchases take place from time to time, subject to market conditions and management’s discretion, in the open market or in privately negotiated transactions. The company retires its common stock upon repurchase and, in the periods presented, has not made any purchases of common stock other than in connection with these publicly announced repurchase programs.

The table below summarizes the company’s share repurchases to date under the authorizations described above:


Repurchase Program Authorization Date	Amount Authorized (in millions)		Total Shares Retired (in millions)	Average Price Per Share(1)		Date Completed	Shares Repurchased (in millions)

							Year Ended December 31
							2020	2019	2018
September 16, 2015	$	4,000	15.4	$	260.33	March 2020	0.9	3.2	3.8
December 4, 2018	$	3,000	0.5	$	326.20		0.5	—	—
							1.4	3.2	3.8

(1)Includes commissions paid.

Dividends on Common Stock

In May 2020, the company increased the quarterly common stock dividend 10 percent to $1.45 per share from the previous amount of $1.32 per share.

In May 2019, the company increased the quarterly common stock dividend 10 percent to $1.32 per share from the previous amount of $1.20 per share.

In May 2018, the company increased the quarterly common stock dividend 9 percent to $1.20 per share from the previous amount of $1.10 per share.

In January 2018, the company increased the quarterly common stock dividend 10 percent to $1.10 per share from the previous amount of $1.00 per share.

Accounts Receivable, Net

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Accounts Receivable, Net

4. ACCOUNTS RECEIVABLE, NET

Accounts receivable, net represent amounts billed and due from customers. Substantially all accounts receivable at December 31, 2020 are expected to be collected in 2021. The company does not believe it has significant exposure to credit risk as the majority of our accounts receivable are due from the U.S. government either as the ultimate customer or in connection with foreign military sales.

Accounts receivable, net consisted of the following:


	December 31
$ in millions	2020		2019
Due from U.S. government (1)	$	956	$	1,030
Due from international and other customers	578		329
Accounts receivable, gross	1,534		1,359
Allowance for expected credit losses	(33)		(33)
Accounts receivable, net	$	1,501	$	1,326

(1)Includes receivables due from the U.S. government associated with foreign military sales (FMS). For FMS, we contract with and are paid by the U.S. government.

Unbilled Receivables, Net

12 Months Ended

Dec. 31, 2020

Unbilled Receivables, Net [Abstract]

Unbilled Receivables Disclosure [Text Block]

5. UNBILLED RECEIVABLES, NET

Unbilled receivables, net represent revenue recognized under the cost-to-cost method that exceeds amounts billed to customers. Substantially all unbilled receivables at December 31, 2020 are expected to be billed and collected in 2021. Progress and performance-based payments are reflected as an offset to the related unbilled receivable balances.

Unbilled receivables, net consisted of the following:


	December 31
$ in millions	2020		2019
Due from U.S. government (1)
Unbilled receivables	$	19,315	$	17,347
Progress and performance-based payments received	(14,615)		(12,838)
Total due from U.S. government	4,700		4,509
Due from international and other customers
Unbilled receivables	3,361		4,063
Progress and performance-based payments received	(2,881)		(3,193)
Total due from international and other customers	480		870
Unbilled receivables, net of progress and performance-based payments received	5,180		5,379
Allowance for expected credit losses	(40)		(45)
Unbilled receivables, net	$	5,140	$	5,334

(1)Includes unbilled receivables due from the U.S. government associated with FMS sales. For FMS, we contract with and are paid by the U.S. government.

Inventoried Costs, Net

12 Months Ended

Dec. 31, 2020

Inventory Disclosure [Abstract]

Inventoried Costs, Net

6. INVENTORIED COSTS, NET

Inventoried costs are primarily associated with contracts where the U.S. government is the primary customer, therefore the company does not believe it has significant exposure to recoverability risk related to these amounts.

Inventoried costs, net consisted of the following:


	December 31
$ in millions	2020		2019
Production costs of contracts in process	$	451	$	476
G&A expenses	41		31
	492		507
Progress and performance-based payments received	(62)		(41)
	430		466
Product inventory and raw material	329		317
Inventoried costs, net	$	759	$	783

Income Taxes

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Income Taxes

7. INCOME TAXES

Federal and foreign income tax expense consisted of the following:


	Year Ended December 31
$ in millions	2020		2019		2018
Federal income tax expense:
Current	$	246	$	758	$	292
Deferred	288		(474)		213
Total federal income tax expense	534		284		505
Foreign income tax expense:
Current	3		10		7
Deferred	2		6		1
Total foreign income tax expense	5		16		8
Total federal and foreign income tax expense	$	539	$	300	$	513

Earnings from foreign operations before income taxes are not material for all periods presented.

Income tax expense differs from the amount computed by multiplying earnings before income taxes by the statutory federal income tax rate due to the following:


	Year Ended December 31
$ in millions	2020				2019				2018
Income tax expense at statutory rate	$	783	21.0	%	$	535	21.0	%	$	786	21.0	%
Research credit	(206)		(5.5)		(216)		(8.5)		(186)		(5.0)
Foreign derived intangible income	(55)		(1.5)		(28)		(1.1)		(16)		(0.4)
Stock compensation - excess tax benefits	(10)		(0.2)		(14)		(0.5)		(27)		(0.7)



Impacts related to the 2017 Tax Act	—		—		—		—		(84)		(2.2)

Other, net	27		0.7		23		0.9		40		1.0
Total federal and foreign income taxes	$	539	14.5	%	$	300	11.8	%	$	513	13.7	%

The year to date 2020 effective tax rate increased to 14.5 percent from 11.8 percent in the same period of 2019. MTM expense reduced the 2020 effective tax rate by 1.3 percentage points and the 2019 effective tax rate by 3.7 percentage points.

The year to date 2019 effective tax rate decreased to 11.8 percent from 13.7 percent in the same period of 2018. MTM expense reduced the 2019 effective tax rate by 3.7 percentage points and the 2018 effective tax rate by 1.1 percentage points. In addition, the company’s effective tax rate for 2019 reflects an increase in benefits for research credits and FDII of $30 million and $12 million, respectively, and the absence of an $84 million benefit associated with the 2017 Tax Act realized in 2018.

In March 2020, the CARES Act was enacted. The CARES Act includes certain changes to U.S. tax law that impact the company, including a technical correction to the 2017 Tax Cuts and Jobs Act, which makes certain qualified improvement property eligible for bonus depreciation. The CARES Act did not have a significant impact on the company’s 2020 effective tax rate. In addition, in December 2020, final revenue recognition regulations under IRC Section 451(b) were issued, which did not have a significant impact on the company’s 2020 effective tax rate. We are evaluating the impact of the 451(b) regulations on 2021 and beyond.

Income tax payments, net of refunds received, were $312 million, $324 million and $270 million for the years ended December 31, 2020, 2019 and 2018, respectively. Taxes receivable, which are included in Prepaid expenses and other current assets in the consolidated statements of financial position, were $792 million and $551 million as of December 31, 2020 and 2019, respectively.

Uncertain Tax Positions

We file income tax returns in the U.S. federal jurisdiction and in various state and foreign jurisdictions. The Northrop Grumman 2014-2018 federal tax returns and refund claims related to its 2007-2016 federal tax returns are currently under Internal Revenue Service (IRS) examination. In addition, legacy Orbital ATK federal tax returns for the year ended March 31, 2015, the nine-month transition period ended December 31, 2015 and calendar years 2016-2017 are currently under appeal with the IRS.

Tax returns for open tax years related to state and foreign jurisdictions remain subject to examination. As state income taxes are generally considered allowable and allocable costs, any individual or aggregate state examination impacts are not expected to have a material impact on our financial results. Amounts currently subject to examination related to foreign jurisdictions are not material.

The change in unrecognized tax benefits during 2020, 2019 and 2018, excluding interest, is as follows:


	December 31
$ in millions	2020		2019		2018
Unrecognized tax benefits at beginning of the year	$	1,223	$	748	$	283
Additions based on tax positions related to the current year	187		158		293
Additions for tax positions of prior years	270		400		207
Reductions for tax positions of prior years	(190)		(65)		(23)
Settlements with taxing authorities	(7)		(15)		(7)
Other, net	(2)		(3)		(5)
Net change in unrecognized tax benefits	258		475		465
Unrecognized tax benefits at end of the year	$	1,481	$	1,223	$	748

Our 2020 increase in unrecognized tax benefits was primarily related to state apportionment, our methods of accounting associated with the timing of revenue recognition and related costs, and the 2017 Tax Act. It is reasonably possible that within the next 12 months our unrecognized tax benefits related to the final revenue recognition regulations under IRC Section 451(b), as referenced above, and future regulatory interpretations of existing tax laws may change. At this time, we cannot reasonably estimate these changes.

Our unrecognized tax liabilities, which include $144 million of accrued interest and penalties, are included in other current and non-current liabilities in the consolidated statements of financial position. If the income tax benefits from these tax positions are ultimately realized, $607 million of federal and foreign tax benefits would reduce the company’s effective tax rate.

Net interest expense within the company’s federal, foreign and state income tax provisions was not material for all years presented.

Deferred Income Taxes

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and tax purposes. Net deferred tax assets and liabilities are classified as non-current in the consolidated statements of financial position.

The tax effects of significant temporary differences and carryforwards that gave rise to year-end deferred federal, state and foreign tax balances, as presented in the consolidated statements of financial position, are as follows:


	December 31
$ in millions	2020		2019
Deferred Tax Assets
Retiree benefits	$	1,738	$	1,827
Accrued employee compensation	360		336
Provisions for accrued liabilities	232		166
Inventory	849		684
Stock-based compensation	40		38
Operating lease liabilities	435		411
Tax credits	343		166
Other	112		73
Gross deferred tax assets	4,109		3,701
Less: valuation allowance	(307)		(160)
Net deferred tax assets	3,802		3,541
Deferred Tax Liabilities
Goodwill	533		515
Purchased intangibles	201		262
Property, plant and equipment, net	737		584
Operating lease right-of-use assets	423		404
Contract accounting differences	1,513		1,225
Other	84		43
Deferred tax liabilities	3,491		3,033
Total net deferred tax assets	$	311	$	508

Realization of deferred tax assets is primarily dependent on generating sufficient taxable income in future periods. The company believes it is more-likely-than-not our net deferred tax assets will be realized.

At December 31, 2020, the company has available tax credits and unused net operating losses of $419 million and $364 million, respectively, that may be applied against future taxable income. The majority of tax credits and net operating losses expire in 2022 through 2046, however, some may be carried forward indefinitely. Due to the uncertainty of the realization of the tax credits and net operating losses, the company has recorded valuation allowances of $221 million and $31 million as of December 31, 2020, respectively.

Undistributed Foreign Earnings

As of December 31, 2020, the company has accumulated undistributed earnings generated by our foreign subsidiaries and most have been taxed in the U.S. as a result of the 2017 Tax Act. The 2017 Tax Act allows for a dividend received deduction for repatriation of earnings. We intend to indefinitely reinvest these earnings, as well as future earnings from our foreign subsidiaries to fund our international operations. In addition, we expect future U.S. cash generation will be sufficient to meet future U.S. cash needs.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Goodwill and Other Purchased Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

8. GOODWILL AND OTHER PURCHASED INTANGIBLE ASSETS

Goodwill

Changes in the carrying amounts of goodwill for the years ended December 31, 2019 and 2020, were as follows:


$ in millions	Aeronautics Systems		Defense Systems		Mission Systems		Space Systems		Total
Balance as of December 31, 2018	$	3,467	$	4,377	$	6,062	$	4,766	$	18,672
Acquisition of Orbital ATK(1)	—		—		—		37		37
Other(3)	—		(1)		—		—		(1)
Balance as of December 31, 2019	$	3,467	$	4,376	$	6,062	$	4,803	$	18,708
Reclassification to assets of disposal group held for sale(2)	—		(966)		(181)		(48)		(1,195)
Other(3)	—		5		—		—		5
Balance as of December 31, 2020	$	3,467	$	3,415	$	5,881	$	4,755	$	17,518

(1)Represents changes to goodwill resulting from measurement period adjustments recorded in 2019 associated with Orbital ATK’s purchase price allocation.

(2)Represents the reclassification of goodwill to assets of disposal group held for sale due to the pending divestiture of our IT and mission support services business (See Note 2).

(3)Other consists primarily of adjustments for foreign currency translation.

At December 31, 2020 and 2019, accumulated goodwill impairment losses totaled $417 million and $153 million at Aeronautics Systems and Space Systems, respectively.

Other Purchased Intangible Assets

Net customer-related and other intangible assets are as follows:


	December 31
$ in millions	2020		2019
Gross customer-related and other intangible assets	$	3,362	$	3,356
Less accumulated amortization	(2,579)		(2,316)
Net customer-related and other intangible assets	$	783	$	1,040

Amortization expense for 2020, 2019 and 2018, was $262 million, $332 million and $203 million, respectively. As of December 31, 2020, the expected future amortization of purchased intangibles for each of the next five years is as follows:


$ in millions
2021	$	205
2022	197
2023	79
2024	56
2025	44

Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value Disclosures

9. FAIR VALUE OF FINANCIAL INSTRUMENTS

The following table presents the financial assets and liabilities the company records at fair value on a recurring basis identified by the level of inputs used to determine fair value. See Note 1 for the definitions of these levels and for further information on our financial instruments.


	December 31, 2020						December 31, 2019
$ in millions	Level 1		Level 2		Total		Level 1		Level 2		Total
Financial Assets (Liabilities)
Marketable securities	$	377	$	1	$	378	$	364	$	1	$	365
Marketable securities valued using NAV					18						17
Total marketable securities	377		1		396		364		1		382
Derivatives	—		—		—		—		(3)		(3)

The notional value of the company’s foreign currency forward contracts at December 31, 2020 and 2019 was $133 million and $98 million, respectively. At December 31, 2020, no portion of the notional value was designated as a cash flow hedge. The portion of notional value designated as a cash flow hedge at December 31, 2019 was $7 million.

The derivative fair values and related unrealized gains/losses at December 31, 2020 and 2019 were not material.

There were no transfers of financial instruments between the three levels of the fair value hierarchy during the years ended December 31, 2020 and 2019.

The carrying value of cash and cash equivalents and commercial paper approximates fair value.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Debt

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Long-Term Debt

10. DEBT

Commercial Paper

The company maintains a commercial paper program that serves as a source of short-term financing with capacity to issue unsecured commercial paper notes up to $2.0 billion. There were no commercial paper borrowings outstanding at December 31, 2020 and December 31, 2019, respectively. The outstanding balance of commercial paper borrowings is recorded in Other current liabilities in the consolidated statements of financial position.

Credit Facilities

In August 2018, the company entered into a five-year senior unsecured credit facility in an aggregate principal amount of $2.0 billion (the “2018 Credit Agreement”). In October 2019, the company amended the 2018 Credit Agreement to extend its maturity date by one year from August 2023 to August 2024. The revolving credit facility established under the 2018 Credit Agreement is intended to support the company’s commercial paper program and other general corporate purposes. At December 31, 2020, there was no balance outstanding under this facility. Commercial paper borrowings reduce the amount available for borrowing under the 2018 Credit Agreement.

In December 2016, a subsidiary of the company entered into a two-year credit facility, with two additional one-year option periods, in an aggregate principal amount of £120 million (the equivalent of approximately $163 million as of December 31, 2020) (the “2016 Credit Agreement”). The 2016 Credit Agreement is guaranteed by the company. The company exercised the second option to extend the maturity to December 2020. In the fourth quarter of 2020, the remaining credit facility balance of £50 million (the equivalent of approximately $68 million as of December 31, 2020) was paid in full and the credit facility was terminated. Borrowings outstanding under this facility in prior periods are recorded in Other current liabilities in the consolidated statements of financial position.

Our credit agreements contain generally customary terms and conditions, including covenants restricting the company’s ability to sell all or substantially all of its assets, merge or consolidate with another entity or undertake other fundamental changes and incur liens. The company also cannot permit the ratio of its debt to capitalization (as set forth in the credit agreements) to exceed 65 percent. At December 31, 2020, the company was in compliance with all covenants under its credit agreements.

Unsecured Senior Notes

In March 2020, the company issued $2.25 billion of unsecured senior notes for general corporate purposes, including debt repayment and working capital, as follows:

•$750 million of 4.40% senior notes due 2030 (the “2030 Notes”),

•$500 million of 5.15% senior notes due 2040 (the “2040 Notes”) and

•$1.0 billion of 5.25% senior notes due 2050 (the “2050 Notes”).

We refer to the 2030 Notes, the 2040 Notes and the 2050 Notes, together, as the “notes.” Interest on the notes is payable semi-annually in arrears. The notes are generally subject to redemption, in whole or in part, at the company’s discretion at any time, or from time to time, prior to maturity at a redemption price equal to the greater of 100% of the principal amount of the notes to be redeemed or an applicable “make-whole” amount, plus accrued and unpaid interest.

Long-term debt consists of the following:


$ in millions		December 31
		2020		2019
Fixed-rate notes and debentures, maturing in	Interest rate
2020	2.08%	$	—	$	1,000
2021	3.50%	700		700
2022	2.55%	1,500		1,500
2023	3.25%	1,050		1,050
2025	2.93%	1,500		1,500
2026	7.75% - 7.88%	527		527
2027	3.20%	750		750
2028	3.25%	2,000		2,000
2030	4.40%	750		—
2031	7.75%	466		466
2040	5.05% - 5.15%	800		300
2043	4.75%	950		950
2045	3.85%	600		600
2047	4.03%	2,250		2,250
2050	5.25%	1,000		—
Credit facilities	1.89%	—		78
Other	Various	235		272
Debt issuance costs		(75)		(64)
Total long-term debt		15,003		13,879
Less: current portion(1)		742		1,109
Long-term debt, net of current portion		$	14,261	$	12,770

(1) The current portion of long-term debt is recorded in Other current liabilities in the consolidated statements of financial position.

The estimated fair value of long-term debt was $18.2 billion and $15.1 billion as of December 31, 2020 and 2019, respectively. We calculated the fair value of long-term debt using Level 2 inputs, based on interest rates available for debt with terms and maturities similar to the company’s existing debt arrangements.

Indentures underlying long-term debt issued by the company or its subsidiaries contain various restrictions with respect to the issuer, including one or more restrictions relating to limitations on liens, sale-leaseback arrangements and funded debt of subsidiaries. The majority of these fixed rate notes and debentures are subject to redemption at the company’s discretion at any time prior to maturity in whole or in part at the principal amount plus any make-whole premium and accrued and unpaid interest. Interest on these fixed rate notes and debentures are payable semi-annually in arrears.

Total interest payments, net of interest received, were $572 million, $521 million and $456 million for the years ended December 31, 2020, 2019 and 2018, respectively.

Maturities of long-term debt as of December 31, 2020, are as follows:


$ in millions
Year Ending December 31
2021	$	742
2022	1,505
2023	1,053
2024	3
2025	1,503
Thereafter	10,285
Total principal payments	15,091
Unamortized premium on long-term debt, net of discount	(13)
Debt issuance costs	(75)
Total long-term debt	$	15,003

Investigations, Claims and Litigation	12 Months Ended
Investigations, Claims and Litigation	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Investigations, Claims and Litigation	11. INVESTIGATIONS, CLAIMS AND LITIGATION On May 4, 2012, the company commenced an action, Northrop Grumman Systems Corp. v. United States, in the U.S. Court of Federal Claims. This lawsuit relates to an approximately $875 million firm fixed-price contract awarded to the company in 2007 by the U.S. Postal Service (USPS) for the construction and delivery of flats sequencing systems (FSS) as part of the postal automation program. The FSS were delivered. The company’s lawsuit seeks approximately $63 million for unpaid portions of the contract price, and approximately $115 million based on the company’s assertions that, through various acts and omissions over the life of the contract, the USPS adversely affected the cost and schedule of performance and materially altered the company’s obligations under the contract. The United States responded to the company’s complaint with an answer, denying most of the company’s claims, and counterclaims seeking approximately $410 million, less certain amounts outstanding under the contract. In the course of the litigation, the United States subsequently amended its counterclaim, reducing it to seek approximately $193 million. The principal counterclaim alleges that the company delayed its performance and caused damages to the USPS because USPS did not realize certain costs savings as early as it had expected. On February 3, 2020, after extensive discovery and motions practice, the parties commenced what was expected to be a seven-week trial. The first four weeks of trial concluded, but the court postponed the remaining estimated three weeks as a result of COVID-19-related concerns. The court resumed trial in November 2020, and following additional COVID-related interruptions, plans to resume trial again during the first week of February 2021. Although the ultimate outcome of this matter, including any possible loss, cannot be predicted or reasonably estimated at this time, the company intends vigorously to pursue and defend the matter. We are engaged in remediation activities relating to environmental conditions allegedly resulting from historic operations at the former United States Navy and Grumman facilities in Bethpage, New York. For over 20 years, we have worked closely with the United States Navy, the United States Environmental Protection Agency, the New York State Department of Environmental Conservation (NYSDEC), the New York State Department of Health and other federal, state and local governmental authorities, to address legacy environmental conditions in Bethpage. In December 2019, the State of New York issued an Amended Record of Decision seeking to impose additional remedial requirements beyond measures the company previously had been taking; the State also communicated that it was assessing potential natural resource damages. In December 2020, the parties reached a tentative agreement regarding the steps the company will take to implement the State’s Amended Record of Decision and to resolve certain potential other claims, including for natural resource damages. The State of New York is preparing to file a new consent decree reflecting the agreement and to seek court approval. We have incurred, and expect to continue to incur, as included in Note 12, substantial remediation costs related to the legacy Bethpage environmental conditions. Applicable remediation standards and other requirements to which we are subject may continue to change, our costs may increase materially and those costs may not be fully recoverable. In addition, we are a party to various, and expect to become a party to additional, legal proceedings and disputes related to remediation, environmental impacts, costs, and the allowability of costs we incur, including with federal and state entities (including the Navy, Defense Contract Management Agency, the State, local municipalities and water districts) and insurance carriers, as well as class action and individual plaintiffs alleging personal injury and property damage and seeking both monetary and non-monetary relief. These Bethpage matters could result in additional costs, fines, penalties, sanctions, compensatory or other damages, determinations on allocation, allowability and coverage, and non- monetary relief. We cannot at this time predict or reasonably estimate the potential cumulative outcomes or ranges of possible liability of these aggregate Bethpage matters. The company is a party to various other investigations, lawsuits, arbitration, claims, enforcement actions and other legal proceedings, including government investigations and claims, that arise in the ordinary course of our business. The nature of legal proceedings is such that we cannot assure the outcome of any particular matter. However, based on information available to the company to date, the company does not believe that the outcome of any of these other matters pending against the company is likely to have a material adverse effect on the company’s consolidated financial position as of December 31, 2020, or its annual results of operations and/or cash flows.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

12. COMMITMENTS AND CONTINGENCIES

U.S. Government Cost Claims and Contingencies

Environmental Matters


$ in millions	Accrued Costs(1)(2)		Reasonably Possible Future Costs in excess of Accrued Costs(2)		Deferred Costs(3)
December 31, 2020	$	614	$	346	$	529
December 31, 2019	531		448		436

(1)As of December 31, 2020, $237 million is recorded in Other current liabilities and $377 million is recorded in Other non-current liabilities.

Financial Arrangements

Indemnifications

Retirement Benefits

12 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Retirement Benefits

13. RETIREMENT BENEFITS

Plan Descriptions

U.S. Defined Benefit Pension Plans – The company sponsors several defined benefit pension plans in the U.S. Pension benefits for most participants are based on years of service, age and compensation. It is our policy to fund at least the minimum amount required for all qualified plans, using actuarial cost methods and assumptions acceptable under U.S. government regulations, by making payments into benefit trusts separate from the company.

U.S. Defined Contribution Plans – The company also sponsors defined contribution plans covering the majority of its employees, including certain employees covered under collective bargaining agreements. Company contributions vary depending on date of hire, with a majority of employees being eligible for employer matching of employee contributions. Based on date of hire, certain employees are eligible to receive a company non-elective contribution or an enhanced matching contribution in lieu of a defined benefit pension plan benefit. The company’s contributions to these defined contribution plans for the years ended December 31, 2020, 2019 and 2018, were $590 million, $481 million and $403 million, respectively.

Non-U.S. Benefit Plans – The company sponsors several benefit plans for non-U.S. employees. These plans are designed to provide benefits appropriate to local practice and in accordance with local regulations. Some of these plans are funded using benefit trusts separate from the company.

Medical and Life Benefits – The company funds a portion of the costs for certain health care and life insurance benefits for a substantial number of its active and retired employees. In addition to a company and employee cost-sharing feature, the health plans also have provisions for deductibles, co-payments, coinsurance percentages, out-of-pocket limits, conformance to a schedule of reasonable fees, the use of managed care providers and coordination of benefits with other plans. The plans also provide for a Medicare carve-out. The company reserves the right to amend or terminate the plans at any time.

Certain covered employees and dependents are eligible to participate in plans upon retirement if they meet specified age and years of service requirements. The company provides subsidies to reimburse certain retirees for a portion of the cost of individual Medicare-supplemental coverage purchased directly by the retiree through a private insurance exchange. The company has capped the amount of its contributions to substantially all of its remaining postretirement medical and life benefit plans. In addition, after January 1, 2005 (or earlier at some businesses), newly hired employees are not eligible for subsidized postretirement medical and life benefits.

Summary Plan Results

The cost to the company of its retirement benefit plans is shown in the following table:


	Year Ended December 31
	Pension Benefits						Medical and Life Benefits
$ in millions	2020		2019		2018		2020		2019		2018
Components of net periodic benefit cost (benefit)
Service cost	$	409	$	367	$	404	$	17	$	16	$	21
Interest cost	1,226		1,360		1,226		67		80		76
Expected return on plan assets	(2,376)		(2,101)		(2,217)		(102)		(92)		(101)
Amortization of prior service cost (credit)	(59)		(59)		(58)		4		(3)		(21)
Mark-to-market expense (benefit)	1,034		1,783		699		—		17		(44)
Other	10		—		—		2		—		—
Net periodic benefit cost (benefit)	$	244	$	1,350	$	54	$	(12)	$	18	$	(69)

The table below summarizes the components of changes in unamortized prior service credit (cost) for the years ended December 31, 2018, 2019 and 2020:


$ in millions	Pension Benefits		Medical and Life Benefits		Total
Changes in unamortized prior service credit
Amortization of prior service credit	$	58	$	21	$	79
Tax expense	(14)		(5)		(19)
Change in unamortized prior service credit – 2018	44		16		60
Amortization of prior service credit	59		3		62
Tax expense	(14)		(1)		(15)
Change in unamortized prior service credit – 2019	45		2		47
Amortization of prior service credit (cost)	59		(4)		55
Tax expense	(15)		1		(14)
Change in unamortized prior service credit (cost) – 2020	$	44	$	(3)	$	41

The following table sets forth the funded status and amounts recognized in the consolidated statements of financial position for the company’s defined benefit retirement plans. Pension benefits data includes the qualified plans, foreign plans and U.S. unfunded non-qualified plans for benefits provided to directors, officers and certain employees. The company uses a December 31 measurement date for its plans.


	Pension Benefits				Medical and Life Benefits
$ in millions	2020		2019		2020		2019
Plan Assets
Fair value of plan assets at beginning of year	$	30,646	$	27,150	$	1,392	$	1,247
Net gain on plan assets	4,802		5,025		218		234
Employer contributions	851		221		36		42
Participant contributions	8		8		24		24
Benefits paid	(1,865)		(1,763)		(155)		(156)
Acquired plan assets	—		—		—		—
Other	10		5		—		1
Fair value of plan assets at end of year	34,452		30,646		1,515		1,392
Projected Benefit Obligation
Projected benefit obligation at beginning of year	36,914		32,231		2,048		1,930
Service cost	409		367		17		16
Interest cost	1,226		1,360		67		80
Participant contributions	8		8		24		24
Actuarial loss	3,455		4,708		115		159
Benefits paid	(1,865)		(1,763)		(155)		(156)
Acquired benefit obligation	—		—		—		—
Other	35		3		3		(5)
Projected benefit obligation at end of year	40,182		36,914		2,119		2,048
Funded status	$	(5,730)	$	(6,268)	$	(604)	$	(656)

Pension Benefits
The increase in our pension assets for the year ended December 31, 2020 was principally driven by net plan asset returns of 16.2 percent and a $750 million discretionary pension contribution. In 2019, pension assets increased primarily due to net plan asset returns of 19.1 percent.

The increase in our projected benefit obligation for the year ended December 31, 2020, was primarily driven by a 71 basis point decrease in the discount rate from year end 2019. In 2019, our projected benefit obligation increased primarily due to a 92 basis point decrease in the discount rate from year end 2018 as well as a change in our mortality assumptions.


	Pension Benefits				Medical and Life Benefits
$ in millions	2020		2019		2020		2019
Classification of amounts recognized in the consolidated statements of financial position
Non-current assets	$	211	$	124	$	179	$	151
Current liability	(180)		(173)		(46)		(47)
Non-current liability	(5,761)		(6,219)		(737)		(760)

The accumulated benefit obligation for all defined benefit pension plans was $39.6 billion and $36.5 billion at December 31, 2020 and 2019, respectively.

Amounts for pension plans with accumulated benefit obligations in excess of fair value of plan assets are as follows:


	December 31
$ in millions	2020		2019
Projected benefit obligation	$	37,681	$	34,715
Accumulated benefit obligation	37,135		34,305
Fair value of plan assets	31,741		28,324

Plan Assumptions

On a weighted-average basis, the following assumptions were used to determine benefit obligations and net periodic benefit cost:


	Pension Benefits				Medical and Life Benefits
	2020		2019		2020		2019
Assumptions used to determine benefit obligation at December 31
Discount rate	2.68	%	3.39	%	2.58	%	3.35	%
Initial cash balance crediting rate assumed for the next year	2.25	%	2.39	%
Rate to which the cash balance crediting rate is assumed to increase (the ultimate rate)	2.25	%	2.64	%
Year that the cash balance crediting rate reaches the ultimate rate	2026		2025
Rate of compensation increase	3.00	%	3.00	%
Initial health care cost trend rate assumed for the next year					5.60	%	5.90	%
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate)					5.00	%	5.00	%
Year that the health care cost trend rate reaches the ultimate trend rate					2023		2023
Assumptions used to determine benefit cost for the year ended December 31
Discount rate	3.39	%	4.31	%	3.35	%	4.30	%
Initial cash balance crediting rate assumed for the next year	2.39	%	3.00	%
Rate to which the cash balance crediting rate is assumed to increase (the ultimate rate)	2.64	%	3.25	%
Year that the cash balance crediting rate reaches the ultimate rate	2025		2024
Expected long-term return on plan assets	8.00	%	8.00	%	7.66	%	7.67	%
Rate of compensation increase	3.00	%	3.00	%
Initial health care cost trend rate assumed for the next year					5.90	%	6.20	%
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate)					5.00	%	5.00	%
Year that the health care cost trend rate reaches the ultimate trend rate					2023		2023

For 2021 FAS expense, we have assumed an expected long-term rate of return on pension plan assets of 7.5 percent and 7.22 percent on OPB plans. We decreased the EROA assumption for 2021 FAS expense following an assessment of the historical and anticipated long-term returns of various asset classes, including consideration of recent Federal Reserve policy changes that are expected to extend the duration of the current low interest rate environment.

Plan Assets and Investment Policy

Plan assets are invested in various asset classes that are expected to produce a sufficient level of diversification and investment return over the long term. Through consultation with our investment management team and outside investment advisers, management develops expected long-term returns for each of the plans’ strategic asset classes. In doing so, we consider a number of factors, including our historical investment performance, current market data such as yields/price-earnings ratios, historical market returns over long periods and periodic surveys of investment managers’ expectations. Liability studies are conducted on a regular basis to provide guidance in setting investment goals with an objective to balance risk. Risk targets are established and monitored against acceptable ranges.

Our investment policies and procedures are designed to ensure the plans’ investments are in compliance with the Employee Retirement Income Security Act (ERISA). Guidelines are established defining permitted investments within each asset class. Derivatives are used for transitioning assets, asset class rebalancing, managing currency risk and for management of fixed-income and alternative investments.

For the majority of the plans’ assets, the investment policies require that the asset allocation be maintained within the following ranges as of December 31, 2020:


						Asset Allocation Ranges
Cash and cash equivalents						—% - 12%
Global public equities						30% - 50%
Fixed-income securities						20% - 40%
Alternative investments						18% - 38%

The table below provides the fair values of the company’s pension and Voluntary Employee Beneficiary Association (VEBA) trust plan assets at December 31, 2020 and 2019, by asset category. The table also identifies the level of inputs used to determine the fair value of assets in each category. See Note 1 for the definitions of these levels. Certain investments that are measured at fair value using NAV per share (or its equivalent) as a practical expedient are not required to be categorized in the fair value hierarchy table. The total fair value of these investments is included in the table below to permit reconciliation of the fair value hierarchy to amounts presented in the funded status table. As of December 31, 2020 and 2019, there were no investments expected to be sold at a value materially different than NAV.


	Level 1				Level 2				Level 3				Total
$ in millions	2020		2019		2020		2019		2020		2019		2020		2019
Asset category
Cash and cash equivalents	$	120	$	233	$	1,238	$	2,572					$	1,358	$	2,805
U.S. equities	2,981		3,341										2,981		3,341
International equities	3,354		3,271						$	2	$	2	3,356		3,273
Fixed-income securities
U.S. Treasuries	22		20		2,273		2,716						2,295		2,736
U.S. Government Agency					258		297						258		297
Non-U.S. Government					332		194						332		194
Corporate debt	31		28		6,228		4,513						6,259		4,541
Asset backed					1,080		892						1,080		892
High yield debt	24		30		48		104						72		134
Bank loans					59		33						59		33
Other assets	(2)		(9)		59		59		2		2		59		52
Investments valued using NAV as a practical expedient
U.S. equities													1,567		1,131
International equities													7,193		5,636
Fixed-income funds													1,959		438
Hedge funds													65		246
Opportunistic investments													2,499		1,459
Private equity funds													2,627		2,454
Real estate funds													2,180		2,376
Payables, net													(232)		—
Fair value of plan assets at the end of the year	$	6,530	$	6,914	$	11,575	$	11,380	$	4	$	4	$	35,967	$	32,038

There were no transfers of plan assets into or out of Level 3 of the fair value hierarchy during the years ended December 31, 2020 and 2019.

international equities consist primarily of common stocks and institutional common trust funds. Investments in certain equity securities, which include domestic and international securities and registered investment companies, and exchange-traded funds with fixed income strategies are valued at the last reported sales or quoted price on the last business day of the reporting period. Fair values for certain fixed-income securities, which are not exchange-traded, are valued using third-party pricing services.

Other assets include derivative assets with a fair value of $29 million and $49 million, derivative liabilities with a fair value of $27 million and $53 million, and net notional amounts of $2.3 billion and $3.6 billion, as of December 31, 2020 and 2019, respectively. Derivative instruments may include exchange traded futures contracts, interest rate swaps, options on futures and swaps, currency contracts, total return swaps and credit default swaps. Notional amounts do not quantify risk or represent assets or liabilities of the pension and VEBA trusts, but are used in the calculation of cash settlement under the contracts. The volume of derivative activity is commensurate with the amounts disclosed at year-end. Certain derivative financial instruments within the pension trust are subject to master netting agreements with certain counterparties.

Investments in certain equity and fixed-income funds, which include common/collective trust funds, and alternative investments, including hedge funds, opportunistic investments, private equity funds and real estate funds, are valued based on the NAV derived by the investment managers, as a practical expedient, and are described further below.

U.S. and International equities: Generally, redemption periods are daily, monthly or quarterly with a notice requirement less than 90 days. As of December 31, 2020 and 2019, there were no unfunded commitments.

Fixed-income funds: Redemption periods are daily, monthly or quarterly with various notice requirements but generally are less than 30 days. As of December 31, 2020, unfunded commitments were $2 million. There were no unfunded commitments as of December 31, 2019.

Hedge funds: Consist of closed-end funds with a 5-10 year life as well as funds that allow redemption requests subject to the liquidity limitations of the underlying investments. As of December 31, 2020 and 2019, unfunded commitments were $9 million and $8 million, respectively.

Opportunistic investments: Opportunistic investments are primarily held in partnerships with a 5-10 year life. As of December 31, 2020 and 2019, unfunded commitments were $1.9 billion and $1.3 billion, respectively.

Private equity funds: The term of each fund is typically 10 or more years and the fund’s investors do not have an option to redeem their interest in the fund. As of December 31, 2020 and 2019, unfunded commitments were $2.3 billion and $1.9 billion, respectively.

Real estate funds: Consist of closed-end real estate funds and infrastructure funds with terms that are typically 10 or more years. This class also contains open-end funds that generally allow investors to redeem their interests in the fund. Unfunded commitments were $60 million as of December 31, 2020 and 2019.

For the years ended December 31, 2020 and 2019, the defined benefit pension and VEBA trusts did not hold any Northrop Grumman common stock.

Benefit Payments

The following table reflects estimated future benefit payments for the next ten years, based upon the same assumptions used to measure the benefit obligation, and includes expected future employee service, as of December 31, 2020:


$ in millions	Pension Plans		Medical and Life Plans		Total
Year Ending December 31
2021	$	1,884	$	152	$	2,036
2022	1,930		153		2,083
2023	1,973		135		2,108
2024	2,017		133		2,150
2025	2,057		130		2,187
2026 through 2030	10,599		556		11,155

In 2021, the company expects to contribute the required minimum funding of approximately $98 million to its pension plans and approximately $43 million to its medical and life benefit plans. During the year ended December 31, 2020, the company made discretionary pension contributions of $750 million.

- Definition

The entire disclosure for retirement benefits.

+ References

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+ Details

Stock Compensation Plans and Other Compensation Arrangements

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Stock Compensation Plans and Other Compensation Arrangements

14. STOCK COMPENSATION PLANS AND OTHER COMPENSATION ARRANGEMENTS

Stock Compensation Plans

At December 31, 2020, the company had stock-based compensation awards outstanding under the following shareholder-approved plans: the 2011 Long-Term Incentive Stock Plan (2011 Plan), applicable to employees and non-employee directors, and the 1993 Stock Plan for Non-Employee Directors (1993 SPND).

Employee Plans – In May 2015, the company’s shareholders approved amendments to the 2011 Plan. These amendments provided that shares issued under the plan would be counted against the aggregate share limit on a one-for-one basis. As amended, 5.1 million shares plus 2.4 million of newly authorized shares were available for issuance under the 2011 Plan; as of December 31, 2020, 5.2 million shares remain available for issuance.

The 2011 Plan provides for the following equity awards: stock options, stock appreciation rights (SARs) and stock awards. Under the 2011 Plan, no SARs have been granted and there are no outstanding stock options. Stock awards include restricted performance stock rights (RPSR) and restricted stock rights (RSR). RPSRs generally vest and are paid following the completion of a three-year performance period, based primarily on achievement of financial objectives determined by the Board. RSRs generally vest 100% after three years. Each includes dividend equivalents, which are paid concurrently with the RPSR or RSR. The terms of equity awards granted under the 2011 Plan provide for accelerated vesting, and in some instances forfeiture, of all or a portion of an award upon termination of employment.

Non-Employee Director Plans – Awards to non-employee directors are made pursuant to the Northrop Grumman Corporation Equity Grant Program for Non-Employee Directors under the 2011 Plan (the Director Program), which was amended and restated effective January 1, 2016. Under the amended Director Program, each non-employee director is awarded an annual equity grant in the form of Automatic Stock Units, which vest on the one-year anniversary of the grant date. Directors may elect to have all or any portion of their Automatic Stock Units paid on (A) the earlier of (i) the beginning of a specified calendar year after the vesting date or (ii) their separation from service as a member of the Board, or (B) on the vesting date.

Directors also may elect to defer to a later year all or a portion of their remaining cash retainer or committee retainer fees into a stock unit account as Elective Stock Units or in alternative investment options. Elective Stock Units are awarded on a quarterly basis. Directors may elect to have all or a portion of their Elective Stock Units paid on the earlier of (i) the beginning of a specified calendar year or (ii) their separation from service as a member of the Board. Stock units awarded under the Director Program are paid out in an equivalent number of shares of Northrop Grumman common stock. Directors are credited with dividend equivalents in connection with the accumulated stock units until the shares of common stock relating to such stock units are issued.

Compensation Expense

Stock-based compensation expense for the years ended December 31, 2020, 2019 and 2018 was $90 million, $127 million and $86 million, respectively. The related tax benefits for stock-based compensation for the years ended December 31, 2020, 2019 and 2018 were $14 million, $14 million and $27 million, respectively.

At December 31, 2020, there was $97 million of unrecognized compensation expense related to unvested stock awards granted under the company’s stock-based compensation plans. These amounts are expected to be charged to expense over a weighted-average period of 1.3 years.

Stock Awards

Compensation expense for stock awards is measured at the grant date based on the fair value of the award and is recognized over the vesting period (generally three years). The fair value of stock awards and performance stock awards is determined based on the closing market price of the company’s common stock on the grant date. The fair value of market-based stock awards is determined at the grant date using a Monte Carlo simulation model. For purposes of measuring compensation expense for performance awards, the number of shares ultimately expected to vest is estimated at each reporting date based on management’s expectations regarding the relevant performance criteria.

Stock award activity for the years ended December 31, 2018, 2019 and 2020, is presented in the table below. Vested awards do not include any adjustments to reflect the final performance measure for issued shares.


	Stock Awards (in thousands)	Weighted- Average Grant Date Fair Value Per Share		Weighted- Average Remaining Contractual Term (in years)
Outstanding at January 1, 2018	938	$	192	1.0
Granted	376	321
Vested	(455)	181
Forfeited	(63)	250
Outstanding at December 31, 2018	796	$	244	0.8
Granted	339	274
Vested	(383)	222
Forfeited	(51)	280
Outstanding at December 31, 2019	701	$	278	0.9
Granted	262	350
Vested	(296)	305
Forfeited	(64)	303
Outstanding at December 31, 2020	603	$	311	1.4

The majority of our stock awards are granted annually during the first quarter.

The grant date fair value of shares issued in settlement of fully vested stock awards was $118 million, $119 million and $93 million during the years ended December 31, 2020, 2019 and 2018, respectively.

Cash Awards

The company grants certain employees cash units (CUs) and cash performance units (CPUs). Depending on actual performance against financial objectives, recipients of CPUs earn between 0 and 200 percent of the original grant. The following table presents the minimum and maximum aggregate payout amounts related to those cash awards granted for the periods presented:


	Year Ended December 31
$ in millions	2020		2019		2018
Minimum aggregate payout amount	$	31	$	36	$	36
Maximum aggregate payout amount	175		203		205

The majority of our cash awards are granted annually during the first quarter. CUs typically vest and settle in cash on the third anniversary of the grant date, while CPUs generally vest and pay out in cash based primarily on the achievement of financial metrics over a three-year period. At December 31, 2020, there was $121 million of unrecognized compensation expense related to cash awards.

Leases (Notes)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Lessee, Operating Leases [Text Block]

15. LEASES

Total Lease Cost

Total lease cost is included in Product and Service costs in the consolidated statement of earnings and comprehensive income and is recorded net of immaterial sublease income. Total lease cost is comprised of the following:


	Year Ended December 31
$ in millions	2020		2019
Operating lease cost	$	320	$	318
Variable lease cost	28		11
Short-term lease cost	93		75
Total lease cost	$	441	$	404

Rental expense for operating leases classified under ASC 840 for the year ended December 31, 2018 was $375 million. This amount is net of immaterial amounts of sublease income.

Supplemental Balance Sheet Information

Supplemental operating lease balance sheet information consists of the following:


	Year Ended December 31
$ in millions	2020		2019
Operating lease right-of-use assets	$	1,533	$	1,511

Other current liabilities	263		261
Operating lease liabilities	1,343		1,308
Total operating lease liabilities	$	1,606	$	1,569

Other Supplemental Information

Other supplemental operating lease information consists of the following:


	Year Ended December 31
$ in millions	2020			2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	275		$	307
Right-of-use assets obtained in exchange for new lease liabilities	345			462

Weighted average remaining lease term	12.1 years			11.6 years
Weighted average discount rate	3.5		%	3.8		%

Maturities of Lease Liabilities

Maturities of operating lease liabilities as of December 31, 2020 are as follows:


$ in millions
Year Ending December 31
2021	$	298
2022	267
2023	228
2024	185
2025	142
Thereafter	902
Total lease payments	2,022
Less: imputed interest	(416)
Present value of operating lease liabilities	$	1,606

As of December 31, 2020, we have approximately $361 million in rental commitments for real estate leases that have not yet commenced. These leases are expected to commence in 2021 with lease terms of 4 to 15 years.

Segment Information

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Segment Information

16. SEGMENT INFORMATION

The company is aligned in four operating sectors, which also comprise our reportable segments: Aeronautics Systems, Defense Systems, Mission Systems and Space Systems.

As discussed in Note 1, beginning in the second quarter of 2020, the company no longer considers certain unallowable costs and environmental matters that are principally managed at the corporate office as part of management’s evaluation of segment operating performance. As a result, certain unallowable compensation and other costs, which were previously included in segment operating results, are now reported in Unallocated corporate expense within operating income. In addition, certain accrued and deferred costs, as well as unallowable costs, if any, associated with certain environmental matters that were previously reflected in segment assets and operating results are now reflected in corporate assets and Unallocated corporate expense within operating income. This change to operating income has been applied retrospectively in the amounts below. See Part II, Item 5 in the Quarterly Report on Form 10-Q for the quarter ended June 30, 2020 for further information regarding the impact of this change on the company’s prior period segment information.

The following table presents sales and operating income by segment:


	Year Ended December 31
$ in millions	2020		2019		2018
Sales
Aeronautics Systems	$	12,169	$	11,116	$	10,293
Defense Systems	7,543		7,495		6,612
Mission Systems	10,080		9,410		8,949
Space Systems	8,744		7,425		5,845
Intersegment eliminations	(1,737)		(1,605)		(1,604)
Total sales	36,799		33,841		30,095
Operating income
Aeronautics Systems	1,206		1,188		1,128
Defense Systems	846		793		697
Mission Systems	1,459		1,408		1,245
Space Systems	893		794		644
Intersegment eliminations	(216)		(205)		(200)
Total segment operating income	4,188		3,978		3,514
Net FAS (service)/CAS pension adjustment	418		465		613
Unallocated corporate expense	(541)		(474)		(347)
Total operating income	$	4,065	$	3,969	$	3,780

Net FAS (Service)/CAS Pension Adjustment

For financial statement purposes, we account for our employee pension plans in accordance with FAS. However, the cost of these plans is charged to our contracts in accordance with the FAR and the related CAS. The net FAS (service)/CAS pension adjustment reflects the difference between CAS pension expense included as cost in segment operating income and the service cost component of FAS expense included in total operating income.

Unallocated Corporate Expense

Unallocated corporate expense includes the portion of corporate costs not considered allowable or allocable under applicable CAS or FAR, and therefore not allocated to the segments, such as a portion of management and administration, legal, environmental, compensation, retiree benefits, advertising and other corporate unallowable costs. Unallocated corporate expense also includes costs not considered part of management’s evaluation of segment operating performance, such as amortization of purchased intangible assets and the additional depreciation expense related to the step-up in fair value of property, plant and equipment acquired through business combinations, as well as certain compensation and other costs.

Disaggregation of Revenue


Sales by Customer Type	Year Ended December 31
	2020				2019				2018
$ in millions	$		%(3)		$		%(3)		$		%(3)
Aeronautics Systems
U.S. government (1)	$	10,411	86	%	$	9,258	83	%	$	8,732	85	%
International (2)	1,595		13	%	1,688		15	%	1,402		13	%
Other customers	41		—	%	67		1	%	86		1	%
Intersegment sales	122		1	%	103		1	%	73		1	%
Aeronautics Systems sales	12,169		100	%	11,116		100	%	10,293		100	%
Defense Systems
U.S. government (1)	5,103		68	%	4,952		66	%	4,132		62	%
International (2)	1,317		17	%	1,442		19	%	1,249		19	%
Other customers	395		5	%	410		6	%	481		7	%
Intersegment sales	728		10	%	691		9	%	750		12	%
Defense Systems sales	7,543		100	%	7,495		100	%	6,612		100	%
Mission Systems
U.S. government (1)	7,279		72	%	6,765		72	%	6,501		73	%
International (2)	1,945		19	%	1,839		19	%	1,653		18	%
Other customers	77		1	%	78		1	%	77		1	%
Intersegment sales	779		8	%	728		8	%	718		8	%
Mission Systems sales	10,080		100	%	9,410		100	%	8,949		100	%
Space Systems
U.S. government (1)	8,110		93	%	6,959		94	%	5,431		93	%
International (2)	331		4	%	185		2	%	130		2	%
Other customers	195		2	%	198		3	%	221		4	%
Intersegment sales	108		1	%	83		1	%	63		1	%
Space Systems sales	8,744		100	%	7,425		100	%	5,845		100	%
Total
U.S. government (1)	30,903		84	%	27,934		83	%	24,796		82	%
International (2)	5,188		14	%	5,154		15	%	4,434		15	%
Other customers	708		2	%	753		2	%	865		3	%
Total Sales	$	36,799	100	%	$	33,841	100	%	$	30,095	100	%

(1)Sales to the U.S. government include sales from contracts for which we are the prime contractor, as well as those for which we are a subcontractor and the ultimate customer is the U.S. government. Each of the company’s segments derives substantial revenue from the U.S. government.

(2) International sales include sales from contracts for which we are the prime contractor, as well as those for which we are a subcontractor and the ultimate customer is an international customer. These sales include foreign military sales contracted through the U.S. government.

(3) Percentages calculated based on total segment sales.


Sales by Contract Type	Year Ended December 31
	2020				2019				2018
$ in millions	$		%(1)		$		%(1)		$		%(1)
Aeronautics Systems
Cost-type	$	6,142	51	%	$	5,299	48	%	$	5,066	50	%
Fixed-price	5,905		49	%	5,714		52	%	5,154		50	%
Intersegment sales	122				103				73
Aeronautics Systems sales	12,169				11,116				10,293
Defense Systems
Cost-type	2,345		34	%	2,509		37	%	2,386		41	%
Fixed-price	4,470		66	%	4,295		63	%	3,476		59	%
Intersegment sales	728				691				750
Defense Systems sales	7,543				7,495				6,612
Mission Systems
Cost-type	3,582		39	%	3,335		38	%	3,099		38	%
Fixed-price	5,719		61	%	5,347		62	%	5,132		62	%
Intersegment sales	779				728				718
Mission Systems sales	10,080				9,410				8,949
Space Systems
Cost-type	6,369		74	%	5,336		73	%	4,453		77	%
Fixed-price	2,267		26	%	2,006		27	%	1,329		23	%
Intersegment sales	108				83				63
Space Systems sales	8,744				7,425				5,845
Total
Cost-type	18,438		50	%	16,479		49	%	15,004		50	%
Fixed-price	18,361		50	%	17,362		51	%	15,091		50	%
Total Sales	$	36,799			$	33,841			$	30,095

(1)Percentages calculated based on external customer sales.


Sales by Geographic Region	Year Ended December 31
	2020				2019				2018
$ in millions	$		%(2)		$		%(2)		$		%(2)
Aeronautics Systems
United States	$	10,452	87	%	$	9,325	85	%	$	8,818	86	%
Asia/Pacific	841		7	%	810		7	%	677		7	%
Europe	574		5	%	587		5	%	536		5	%
All other (1)	180		1	%	291		3	%	189		2	%
Intersegment sales	122				103				73
Aeronautics Systems sales	12,169				11,116				10,293
Defense Systems
United States	5,498		81	%	5,362		79	%	4,613		79	%
Asia/Pacific	402		6	%	369		5	%	365		6	%
Europe	315		4	%	249		4	%	204		3	%
All other (1)	600		9	%	824		12	%	680		12	%
Intersegment sales	728				691				750
Defense Systems sales	7,543				7,495				6,612
Mission Systems
United States	7,356		79	%	6,843		79	%	6,578		80	%
Asia/Pacific	707		8	%	637		7	%	592		7	%
Europe	893		9	%	850		10	%	682		8	%
All other (1)	345		4	%	352		4	%	379		5	%
Intersegment sales	779				728				718
Mission Systems sales	10,080				9,410				8,949
Space Systems
United States	8,305		96	%	7,157		98	%	5,652		98	%
Asia/Pacific	18		—	%	20		—	%	32		—	%
Europe	300		4	%	147		2	%	92		2	%
All other (1)	13		—	%	18		—	%	6		—	%
Intersegment sales	108				83				63
Space Systems sales	8,744				7,425				5,845
Total
United States	31,611		86	%	28,687		85	%	25,661		85	%
Asia/Pacific	1,968		5	%	1,836		6	%	1,666		6	%
Europe	2,082		6	%	1,833		5	%	1,514		5	%
All other (1)	1,138		3	%	1,485		4	%	1,254		4	%
Total Sales	$	36,799			$	33,841			$	30,095

(1)All other is principally comprised of the Middle East.

(2)Percentages calculated based on external customer sales.

Intersegment Sales and Operating Income

Sales between segments are recorded at values that include intercompany operating income for the performing segment based on that segment’s estimated average operating margin rate for external sales. Such intercompany operating income is eliminated in consolidation, so that the company’s total sales and total operating income reflect only those transactions with external customers. See Note 1 for additional information.

The following table presents intersegment sales and operating income before eliminations:


	Year Ended December 31
$ in millions	2020					2019					2018
	Sales		Operating Income			Sales		Operating Income			Sales		Operating Income
Intersegment sales and operating income
Aeronautics Systems	$	122		$	11	$	103		$	10	$	73		$	8
Defense Systems	728			76		691			74		750			74
Mission Systems	779			116		728			113		718			115
Space Systems	108			13		83			8		63			3
Total	$	1,737		$	216	$	1,605		$	205	$	1,604		$	200

Assets

Substantially all of the company’s operating assets are located in the U.S. The following table presents assets by segment:


	December 31
$ in millions	2020		2019
Assets
Aeronautics Systems	$	8,997	$	9,104
Defense Systems	7,352		7,420
Mission Systems	10,029		9,934
Space Systems	10,028		10,595

Corporate assets(1)	8,063		4,036
Total assets	$	44,469	$	41,089

(1)Corporate assets principally consist of cash and cash equivalents, refundable taxes, deferred tax assets, property, plant and equipment, marketable securities and deferred costs associated with certain environmental matters. Beginning in 2020, certain additional environmental matters that were previously reflected in segment assets are now reflected in corporate assets.

Capital Expenditures and Depreciation and Amortization

The following table presents capital expenditures and depreciation and amortization by segment:


	Year Ended December 31
$ in millions	2020		2019		2018		2020		2019		2018
	Capital Expenditures						Depreciation and Amortization(1)
Aeronautics Systems	$	540	$	528	$	657	$	238	$	224	$	190
Defense Systems	78		71		66		48		44		65
Mission Systems	302		229		197		150		133		121
Space Systems	440		352		226		211		189		130
Corporate	60		84		103		358		428		294
Total	$	1,420	$	1,264	$	1,249	$	1,005	$	1,018	$	800

(1)Corporate amounts include the amortization of purchased intangible assets and the additional depreciation expense related to the step-up in fair value of property, plant and equipment acquired through business combinations as they are not considered part of management’s evaluation of segment operating performance.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

Unaudited Selected Quarterly Data

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

17. UNAUDITED SELECTED QUARTERLY DATA

Unaudited quarterly financial results are set forth in the following tables. It is the company’s long-standing practice to establish actual interim closing dates using a “fiscal” calendar in which we close our books on a Friday near each quarter-end date, in order to normalize the potentially disruptive effects of quarterly closings on business processes. This practice is only used at interim periods within a reporting year.


2020
In millions, except per share amounts	1st Qtr		2nd Qtr		3rd Qtr		4th Qtr
Sales	$	8,620	$	8,884	$	9,083	$	10,212
Operating income	934		994		985		1,152
Net earnings	868		1,005		986		330

Basic earnings per share	5.18		6.02		5.91		1.98
Diluted earnings per share	5.15		6.01		5.89		1.97

Weighted-average common shares outstanding	167.7		166.9		166.8		166.8
Weighted-average diluted shares outstanding	168.4		167.3		167.3		167.4


2019
In millions, except per share amounts	1st Qtr		2nd Qtr		3rd Qtr		4th Qtr
Sales	$	8,189	$	8,456	$	8,475	$	8,721
Operating income	936		946		951		1,136
Net earnings (loss)	863		861		933		(409)

Basic earnings (loss) per share	5.08		5.07		5.52		(2.43)
Diluted earnings (loss) per share(1)	5.06		5.06		5.49		(2.43)

Weighted-average common shares outstanding	170.0		169.7		169.1		168.4
Weighted-average diluted shares outstanding(1)	170.7		170.3		169.9		168.4

(1)Fourth quarter 2019 excludes the dilutive effect of awards granted to employees under stock-based compensation plans as such awards would be antidilutive.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Principles of Consolidation

Principles of ConsolidationThe consolidated financial statements include the accounts of Northrop Grumman and its subsidiaries and joint ventures or other investments for which we consolidate the financial results. Intercompany accounts, transactions and profits are eliminated in consolidation. Investments in equity securities and joint ventures where the company has significant influence, but not control, are accounted for using the equity method.Sales between segments are recorded at values that include intercompany operating income for the performing segment based on that segment’s estimated average operating margin rate for external sales. Such intercompany operating income is eliminated in consolidation

Accounting Estimates

Revenue Recognition

Contract Estimates

General and Administrative Expenses

Research and Development

Research and DevelopmentCompany-sponsored research and development activities primarily include efforts related to government programs. Customer-funded research and development activities are charged directly to the related contracts.

Income Taxes

Cash and cash equivalents

Cash and Cash Equivalents

Fair Value of Financial Instruments

These two types of inputs create the following fair value hierarchy:

Level 1 - Quoted prices for identical instruments in active markets.

Level 3 - Significant inputs to the valuation model are unobservable.

We calculated the fair value of long-term debt using Level 2 inputs, based on interest rates available for debt with terms and maturities similar to the company’s existing debt arrangements.

Marketable Securities

Marketable securities accounted for as trading are recorded at fair value on a recurring basis and are included in Other non-current assets in the consolidated statements of financial position. Changes in unrealized gains and losses on trading securities are included in Other, net in the consolidated statements of earnings and comprehensive income. Investments in held-to-maturity instruments with original maturities greater than three months are recorded at amortized cost.

Derivative Financial Instruments

Inventoried Costs

Cash Surrender Value of Life Insurance Policies

Cash Surrender Value of Life Insurance PoliciesThe company maintains whole life insurance policies on a group of executives, which are recorded at their cash surrender value as determined by the insurance carrier. The company also has split-dollar life insurance policies on former officers and executives from acquired businesses, which are recorded at the lesser of their cash surrender value or premiums paid. These policies are utilized as a partial funding source for deferred compensation and other non-qualified employee retirement plans.

Property, Plant and Equipment


		December 31
Useful life in years, $ in millions	Useful Life	2020		2019
Land and land improvements	Up to 40(1)	$	628	$	619
Buildings and improvements	Up to 45	2,762		2,575
Machinery and other equipment	Up to 20	7,206		6,997
Capitalized software costs	3-5	602		606
Leasehold improvements	Lease Term(2)	2,208		1,965
Property, plant and equipment, at cost		13,406		12,762
Accumulated depreciation		(6,335)		(5,850)
Property, plant and equipment, net		$	7,071	$	6,912

(1)Land is not a depreciable asset.

(2)Leasehold improvements are depreciated over the shorter of the useful life of the asset or lease term.

Goodwill and Other Purchased Intangible Assets

Leases

Operating lease balances are included in Operating lease right-of-use assets, Other current liabilities, and Operating lease liabilities in our consolidated statements of financial position.

Litigation, Commitments, and Contingencies

Litigation, Commitments and Contingencies

Environmental costs

Environmental Costs

These amounts are evaluated for recoverability on a routine basis.

Retirement Benefits

For the majority of the plans’ assets, the investment policies require that the asset allocation be maintained within the following ranges as of December 31, 2020:


						Asset Allocation Ranges
Cash and cash equivalents						—% - 12%
Global public equities						30% - 50%
Fixed-income securities						20% - 40%
Alternative investments						18% - 38%

Generally, investments are valued based on information in financial publications of general circulation, statistical and valuation services, records of security exchanges, appraisal by qualified persons, transactions and bona fide offers. Cash and cash equivalents are predominantly held in money market or short-term investment funds. U.S. and international equities consist primarily of common stocks and institutional common trust funds. Investments in certain equity securities, which include domestic and international securities and registered investment companies, and exchange-traded funds with fixed income strategies are valued at the last reported sales or quoted price on the last business day of the reporting period. Fair values for certain fixed-income securities, which are not exchange-traded, are valued using third-party pricing services.Investments in certain equity and fixed-income funds, which include common/collective trust funds, and alternative investments, including hedge funds, opportunistic investments, private equity funds and real estate funds, are valued based on the NAV derived by the investment managers, as a practical expedient, and are described further below. U.S. and International equities: Generally, redemption periods are daily, monthly or quarterly with a notice requirement less than 90 days.Fixed-income funds: Redemption periods are daily, monthly or quarterly with various notice requirements but generally are less than 30 days. Hedge funds: Consist of closed-end funds with a 5-10 year life as well as funds that allow redemption requests subject to the liquidity limitations of the underlying investments.Opportunistic investments: Opportunistic investments are primarily held in partnerships with a 5-10 year life.Private equity funds: The term of each fund is typically 10 or more years and the fund’s investors do not have an option to redeem their interest in the fund. Real estate funds: Consist of closed-end real estate funds and infrastructure funds with terms that are typically 10 or more years. This class also contains open-end funds that generally allow investors to redeem their interests in the fund. Unfunded commitments were

Stock Compensation

Earnings Per Share

We calculate basic earnings per share by dividing net earnings by the weighted-average number of shares of common stock outstanding during each period.Diluted earnings per share include the dilutive effect of awards granted to employees under stock-based compensation plans.

Fiscal Month Accounting Convention

It is the company’s long-standing practice to establish actual interim closing dates using a “fiscal” calendar in which we close our books on a Friday near each quarter-end date, in order to normalize the potentially disruptive effects of quarterly closings on business processes. This practice is only used at interim periods within a reporting year.

Trade and Other Accounts Receivable, Unbilled Receivables, Policy

Accounts receivable, net represent amounts billed and due from customers.Unbilled receivables, net represent revenue recognized under the cost-to-cost method that exceeds amounts billed to customers.

New Accounting Pronouncements, Policy

Receivables, Loans, Notes Receivable, and Others (Policies)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Trade and Other Accounts Receivable, Unbilled Receivables, Policy	Accounts receivable, net represent amounts billed and due from customers.Unbilled receivables, net represent revenue recognized under the cost-to-cost method that exceeds amounts billed to customers.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Change in Accounting Estimate

The following table presents the effect of aggregate net EAC adjustments:


	Year Ended December 31
$ in millions, except per share data	2020		2019		2018
Revenue	$	504	$	538	$	631
Operating income	466		480		577
Net earnings(1)	368		379		456
Diluted earnings per share(1)	2.20		2.23		2.61

(1)Based on a 21% federal statutory tax rate.

Contract with Customer, Asset and Liability

Net contract assets are as follows:


$ in millions	December 31, 2020		December 31, 2019		$ Change		% Change
Unbilled receivables, net	$	5,140	$	5,334	$	(194)	(4)	%
Advance payments and amounts in excess of costs incurred	(2,517)		(2,237)		(280)		13	%
Net contract assets	$	2,623	$	3,097	$	(474)	(15)	%

Property, Plant and Equipment

Major classes of property, plant and equipment and their useful lives are as follows:


		December 31
Useful life in years, $ in millions	Useful Life	2020		2019
Land and land improvements	Up to 40(1)	$	628	$	619
Buildings and improvements	Up to 45	2,762		2,575
Machinery and other equipment	Up to 20	7,206		6,997
Capitalized software costs	3-5	602		606
Leasehold improvements	Lease Term(2)	2,208		1,965
Property, plant and equipment, at cost		13,406		12,762
Accumulated depreciation		(6,335)		(5,850)
Property, plant and equipment, net		$	7,071	$	6,912

(1)Land is not a depreciable asset.

(2)Leasehold improvements are depreciated over the shorter of the useful life of the asset or lease term.

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows:


	December 31
$ in millions	2020		2019
Unamortized prior service credit, net of tax expense of $3 for 2020 and $17 for 2019	$	10	$	51
Cumulative translation adjustment and other, net	(138)		(148)

Total accumulated other comprehensive loss	$	(128)	$	(97)

Acquisition and Dispositions (Tables)

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

The Merger date fair value of the consideration transferred totaled $7.7 billion in cash, which was comprised of the following:


$ in millions, except per share amounts	Purchase price
Shares of Orbital ATK common stock outstanding as of the Merger date	57,562,152
Cash consideration per share of Orbital ATK common stock	$	134.50
Total purchase price	$	7,742

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

The following purchase price allocation table presents the company’s final determination of the fair values of assets acquired and liabilities assumed at the Merger date:


$ in millions	As of June 6, 2018
Cash and cash equivalents	$	85
Accounts receivable	596
Unbilled receivables	1,237
Inventoried costs	220
Other current assets	237
Property, plant and equipment	1,509
Goodwill	6,259
Intangible assets	1,525
Other non-current assets	151
Total assets acquired	11,819
Trade accounts payable	(397)
Accrued employee compensation	(158)
Advance payments and billings in excess of costs incurred	(222)
Below market contracts(1)	(151)
Other current liabilities	(412)
Long-term debt	(1,687)
Pension and OPB plan liabilities	(613)
Deferred tax liabilities	(248)
Other non-current liabilities	(189)
Total liabilities assumed	(4,077)
Total purchase price	$	7,742

(1)Included in Other current liabilities in the consolidated statements of financial position.

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

The following table presents a summary of purchased intangible assets and their related estimated useful lives:


	Fair Value (in millions)		Estimated Useful Life in Years
Customer contracts	$	1,245	9
Commercial customer relationships	280		13
Total customer-related intangible assets	$	1,525

Business Acquisition, Pro Forma Information [Table Text Block]



$ in millions, except per share amounts
Sales	$	32,319
Net earnings	3,417
Diluted earnings per share	19.57

Business Combination, Separately Recognized Transactions

The carrying amounts of the major classes of assets and liabilities of the IT and mission support services business classified as held for sale as of December 31, 2020 are as follows:


$ in millions
Accounts receivable, net	$	110
Unbilled receivables, net	269
Other current assets	9
Property, plant and equipment	14
Operating lease right-of-use assets	38
Goodwill(1)	1,195

Total assets of disposal group held for sale	$	1,635
Trade accounts payable	(99)
Accrued employee compensation	(59)
Advance payments and billings in excess of costs incurred	(31)

Other current liabilities	(42)
Non-current operating lease liabilities	(27)

Total liabilities of disposal group held for sale	$	(258)

(1) See Note 8 for a summary by reportable segment of Goodwill reclassified to Assets of disposal group held for sale.

Earnings Per Share, Share Repurchases and Dividends on Common Stock (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Share Repurchases

The table below summarizes the company’s share repurchases to date under the authorizations described above:


Repurchase Program Authorization Date	Amount Authorized (in millions)		Total Shares Retired (in millions)	Average Price Per Share(1)		Date Completed	Shares Repurchased (in millions)

							Year Ended December 31
							2020	2019	2018
September 16, 2015	$	4,000	15.4	$	260.33	March 2020	0.9	3.2	3.8
December 4, 2018	$	3,000	0.5	$	326.20		0.5	—	—
							1.4	3.2	3.8

(1)Includes commissions paid.

Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Accounts receivable

Accounts receivable, net consisted of the following:


	December 31
$ in millions	2020		2019
Due from U.S. government (1)	$	956	$	1,030
Due from international and other customers	578		329
Accounts receivable, gross	1,534		1,359
Allowance for expected credit losses	(33)		(33)
Accounts receivable, net	$	1,501	$	1,326

(1)Includes receivables due from the U.S. government associated with foreign military sales (FMS). For FMS, we contract with and are paid by the U.S. government.

Unbilled Receivables, Net (Tables)

12 Months Ended

Dec. 31, 2020

Unbilled Receivables, Net [Abstract]

Unbilled receivables

Unbilled receivables, net consisted of the following:


	December 31
$ in millions	2020		2019
Due from U.S. government (1)
Unbilled receivables	$	19,315	$	17,347
Progress and performance-based payments received	(14,615)		(12,838)
Total due from U.S. government	4,700		4,509
Due from international and other customers
Unbilled receivables	3,361		4,063
Progress and performance-based payments received	(2,881)		(3,193)
Total due from international and other customers	480		870
Unbilled receivables, net of progress and performance-based payments received	5,180		5,379
Allowance for expected credit losses	(40)		(45)
Unbilled receivables, net	$	5,140	$	5,334

(1)Includes unbilled receivables due from the U.S. government associated with FMS sales. For FMS, we contract with and are paid by the U.S. government.

Inventoried Costs, Net (Tables)

12 Months Ended

Dec. 31, 2020

Inventory Disclosure [Abstract]

Inventoried Costs

Inventoried costs, net consisted of the following:


	December 31
$ in millions	2020		2019
Production costs of contracts in process	$	451	$	476
G&A expenses	41		31
	492		507
Progress and performance-based payments received	(62)		(41)
	430		466
Product inventory and raw material	329		317
Inventoried costs, net	$	759	$	783

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Income tax expense

Federal and foreign income tax expense consisted of the following:


	Year Ended December 31
$ in millions	2020		2019		2018
Federal income tax expense:
Current	$	246	$	758	$	292
Deferred	288		(474)		213
Total federal income tax expense	534		284		505
Foreign income tax expense:
Current	3		10		7
Deferred	2		6		1
Total foreign income tax expense	5		16		8
Total federal and foreign income tax expense	$	539	$	300	$	513

Income tax reconciliation

Income tax expense differs from the amount computed by multiplying earnings before income taxes by the statutory federal income tax rate due to the following:


	Year Ended December 31
$ in millions	2020				2019				2018
Income tax expense at statutory rate	$	783	21.0	%	$	535	21.0	%	$	786	21.0	%
Research credit	(206)		(5.5)		(216)		(8.5)		(186)		(5.0)
Foreign derived intangible income	(55)		(1.5)		(28)		(1.1)		(16)		(0.4)
Stock compensation - excess tax benefits	(10)		(0.2)		(14)		(0.5)		(27)		(0.7)



Impacts related to the 2017 Tax Act	—		—		—		—		(84)		(2.2)

Other, net	27		0.7		23		0.9		40		1.0
Total federal and foreign income taxes	$	539	14.5	%	$	300	11.8	%	$	513	13.7	%

Unrecognized tax benefit rollforward

The change in unrecognized tax benefits during 2020, 2019 and 2018, excluding interest, is as follows:


	December 31
$ in millions	2020		2019		2018
Unrecognized tax benefits at beginning of the year	$	1,223	$	748	$	283
Additions based on tax positions related to the current year	187		158		293
Additions for tax positions of prior years	270		400		207
Reductions for tax positions of prior years	(190)		(65)		(23)
Settlements with taxing authorities	(7)		(15)		(7)
Other, net	(2)		(3)		(5)
Net change in unrecognized tax benefits	258		475		465
Unrecognized tax benefits at end of the year	$	1,481	$	1,223	$	748

Components of deferred tax assets and liabilities


	December 31
$ in millions	2020		2019
Deferred Tax Assets
Retiree benefits	$	1,738	$	1,827
Accrued employee compensation	360		336
Provisions for accrued liabilities	232		166
Inventory	849		684
Stock-based compensation	40		38
Operating lease liabilities	435		411
Tax credits	343		166
Other	112		73
Gross deferred tax assets	4,109		3,701
Less: valuation allowance	(307)		(160)
Net deferred tax assets	3,802		3,541
Deferred Tax Liabilities
Goodwill	533		515
Purchased intangibles	201		262
Property, plant and equipment, net	737		584
Operating lease right-of-use assets	423		404
Contract accounting differences	1,513		1,225
Other	84		43
Deferred tax liabilities	3,491		3,033
Total net deferred tax assets	$	311	$	508

Goodwill and Other Purchased Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

Changes in the carrying amounts of goodwill for the years ended December 31, 2019 and 2020, were as follows:


$ in millions	Aeronautics Systems		Defense Systems		Mission Systems		Space Systems		Total
Balance as of December 31, 2018	$	3,467	$	4,377	$	6,062	$	4,766	$	18,672
Acquisition of Orbital ATK(1)	—		—		—		37		37
Other(3)	—		(1)		—		—		(1)
Balance as of December 31, 2019	$	3,467	$	4,376	$	6,062	$	4,803	$	18,708
Reclassification to assets of disposal group held for sale(2)	—		(966)		(181)		(48)		(1,195)
Other(3)	—		5		—		—		5
Balance as of December 31, 2020	$	3,467	$	3,415	$	5,881	$	4,755	$	17,518

(1)Represents changes to goodwill resulting from measurement period adjustments recorded in 2019 associated with Orbital ATK’s purchase price allocation.

(2)Represents the reclassification of goodwill to assets of disposal group held for sale due to the pending divestiture of our IT and mission support services business (See Note 2).

(3)Other consists primarily of adjustments for foreign currency translation.

Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]

Net customer-related and other intangible assets are as follows:


	December 31
$ in millions	2020		2019
Gross customer-related and other intangible assets	$	3,362	$	3,356
Less accumulated amortization	(2,579)		(2,316)
Net customer-related and other intangible assets	$	783	$	1,040

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

As of December 31, 2020, the expected future amortization of purchased intangibles for each of the next five years is as follows:


$ in millions
2021	$	205
2022	197
2023	79
2024	56
2025	44

Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Fair value of assets and liabilities measured on a recurring basis


	December 31, 2020						December 31, 2019
$ in millions	Level 1		Level 2		Total		Level 1		Level 2		Total
Financial Assets (Liabilities)
Marketable securities	$	377	$	1	$	378	$	364	$	1	$	365
Marketable securities valued using NAV					18						17
Total marketable securities	377		1		396		364		1		382
Derivatives	—		—		—		—		(3)		(3)

Debt (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Long-term debt

Long-term debt consists of the following:


$ in millions		December 31
		2020		2019
Fixed-rate notes and debentures, maturing in	Interest rate
2020	2.08%	$	—	$	1,000
2021	3.50%	700		700
2022	2.55%	1,500		1,500
2023	3.25%	1,050		1,050
2025	2.93%	1,500		1,500
2026	7.75% - 7.88%	527		527
2027	3.20%	750		750
2028	3.25%	2,000		2,000
2030	4.40%	750		—
2031	7.75%	466		466
2040	5.05% - 5.15%	800		300
2043	4.75%	950		950
2045	3.85%	600		600
2047	4.03%	2,250		2,250
2050	5.25%	1,000		—
Credit facilities	1.89%	—		78
Other	Various	235		272
Debt issuance costs		(75)		(64)
Total long-term debt		15,003		13,879
Less: current portion(1)		742		1,109
Long-term debt, net of current portion		$	14,261	$	12,770

(1) The current portion of long-term debt is recorded in Other current liabilities in the consolidated statements of financial position.

Long-term debt maturities

Maturities of long-term debt as of December 31, 2020, are as follows:


$ in millions
Year Ending December 31
2021	$	742
2022	1,505
2023	1,053
2024	3
2025	1,503
Thereafter	10,285
Total principal payments	15,091
Unamortized premium on long-term debt, net of discount	(13)
Debt issuance costs	(75)
Total long-term debt	$	15,003

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 942
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Environmental Remediation [Table Text Block]


$ in millions	Accrued Costs(1)(2)		Reasonably Possible Future Costs in excess of Accrued Costs(2)		Deferred Costs(3)
December 31, 2020	$	614	$	346	$	529
December 31, 2019	531		448		436

(1)As of December 31, 2020, $237 million is recorded in Other current liabilities and $377 million is recorded in Other non-current liabilities.

Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Components of net periodic benefit cost

The cost to the company of its retirement benefit plans is shown in the following table:


	Year Ended December 31
	Pension Benefits						Medical and Life Benefits
$ in millions	2020		2019		2018		2020		2019		2018
Components of net periodic benefit cost (benefit)
Service cost	$	409	$	367	$	404	$	17	$	16	$	21
Interest cost	1,226		1,360		1,226		67		80		76
Expected return on plan assets	(2,376)		(2,101)		(2,217)		(102)		(92)		(101)
Amortization of prior service cost (credit)	(59)		(59)		(58)		4		(3)		(21)
Mark-to-market expense (benefit)	1,034		1,783		699		—		17		(44)
Other	10		—		—		2		—		—
Net periodic benefit cost (benefit)	$	244	$	1,350	$	54	$	(12)	$	18	$	(69)

Changes in unamortized benefit plan costs

The table below summarizes the components of changes in unamortized prior service credit (cost) for the years ended December 31, 2018, 2019 and 2020:


$ in millions	Pension Benefits		Medical and Life Benefits		Total
Changes in unamortized prior service credit
Amortization of prior service credit	$	58	$	21	$	79
Tax expense	(14)		(5)		(19)
Change in unamortized prior service credit – 2018	44		16		60
Amortization of prior service credit	59		3		62
Tax expense	(14)		(1)		(15)
Change in unamortized prior service credit – 2019	45		2		47
Amortization of prior service credit (cost)	59		(4)		55
Tax expense	(15)		1		(14)
Change in unamortized prior service credit (cost) – 2020	$	44	$	(3)	$	41

Change in plan assets and amounts recognized in the consolidated statements of financial position


	Pension Benefits				Medical and Life Benefits
$ in millions	2020		2019		2020		2019
Plan Assets
Fair value of plan assets at beginning of year	$	30,646	$	27,150	$	1,392	$	1,247
Net gain on plan assets	4,802		5,025		218		234
Employer contributions	851		221		36		42
Participant contributions	8		8		24		24
Benefits paid	(1,865)		(1,763)		(155)		(156)
Acquired plan assets	—		—		—		—
Other	10		5		—		1
Fair value of plan assets at end of year	34,452		30,646		1,515		1,392
Projected Benefit Obligation
Projected benefit obligation at beginning of year	36,914		32,231		2,048		1,930
Service cost	409		367		17		16
Interest cost	1,226		1,360		67		80
Participant contributions	8		8		24		24
Actuarial loss	3,455		4,708		115		159
Benefits paid	(1,865)		(1,763)		(155)		(156)
Acquired benefit obligation	—		—		—		—
Other	35		3		3		(5)
Projected benefit obligation at end of year	40,182		36,914		2,119		2,048
Funded status	$	(5,730)	$	(6,268)	$	(604)	$	(656)


	Pension Benefits				Medical and Life Benefits
$ in millions	2020		2019		2020		2019
Classification of amounts recognized in the consolidated statements of financial position
Non-current assets	$	211	$	124	$	179	$	151
Current liability	(180)		(173)		(46)		(47)
Non-current liability	(5,761)		(6,219)		(737)		(760)

Pension plans with accumulated benefit obligations in excess of fair value of plan assets

Amounts for pension plans with accumulated benefit obligations in excess of fair value of plan assets are as follows:


	December 31
$ in millions	2020		2019
Projected benefit obligation	$	37,681	$	34,715
Accumulated benefit obligation	37,135		34,305
Fair value of plan assets	31,741		28,324

Weighted-average plan assumptions

On a weighted-average basis, the following assumptions were used to determine benefit obligations and net periodic benefit cost:


	Pension Benefits				Medical and Life Benefits
	2020		2019		2020		2019
Assumptions used to determine benefit obligation at December 31
Discount rate	2.68	%	3.39	%	2.58	%	3.35	%
Initial cash balance crediting rate assumed for the next year	2.25	%	2.39	%
Rate to which the cash balance crediting rate is assumed to increase (the ultimate rate)	2.25	%	2.64	%
Year that the cash balance crediting rate reaches the ultimate rate	2026		2025
Rate of compensation increase	3.00	%	3.00	%
Initial health care cost trend rate assumed for the next year					5.60	%	5.90	%
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate)					5.00	%	5.00	%
Year that the health care cost trend rate reaches the ultimate trend rate					2023		2023
Assumptions used to determine benefit cost for the year ended December 31
Discount rate	3.39	%	4.31	%	3.35	%	4.30	%
Initial cash balance crediting rate assumed for the next year	2.39	%	3.00	%
Rate to which the cash balance crediting rate is assumed to increase (the ultimate rate)	2.64	%	3.25	%
Year that the cash balance crediting rate reaches the ultimate rate	2025		2024
Expected long-term return on plan assets	8.00	%	8.00	%	7.66	%	7.67	%
Rate of compensation increase	3.00	%	3.00	%
Initial health care cost trend rate assumed for the next year					5.90	%	6.20	%
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate)					5.00	%	5.00	%
Year that the health care cost trend rate reaches the ultimate trend rate					2023		2023

Plan asset allocation

For the majority of the plans’ assets, the investment policies require that the asset allocation be maintained within the following ranges as of December 31, 2020:


						Asset Allocation Ranges
Cash and cash equivalents						—% - 12%
Global public equities						30% - 50%
Fixed-income securities						20% - 40%
Alternative investments						18% - 38%


	Level 1				Level 2				Level 3				Total
$ in millions	2020		2019		2020		2019		2020		2019		2020		2019
Asset category
Cash and cash equivalents	$	120	$	233	$	1,238	$	2,572					$	1,358	$	2,805
U.S. equities	2,981		3,341										2,981		3,341
International equities	3,354		3,271						$	2	$	2	3,356		3,273
Fixed-income securities
U.S. Treasuries	22		20		2,273		2,716						2,295		2,736
U.S. Government Agency					258		297						258		297
Non-U.S. Government					332		194						332		194
Corporate debt	31		28		6,228		4,513						6,259		4,541
Asset backed					1,080		892						1,080		892
High yield debt	24		30		48		104						72		134
Bank loans					59		33						59		33
Other assets	(2)		(9)		59		59		2		2		59		52
Investments valued using NAV as a practical expedient
U.S. equities													1,567		1,131
International equities													7,193		5,636
Fixed-income funds													1,959		438
Hedge funds													65		246
Opportunistic investments													2,499		1,459
Private equity funds													2,627		2,454
Real estate funds													2,180		2,376
Payables, net													(232)		—
Fair value of plan assets at the end of the year	$	6,530	$	6,914	$	11,575	$	11,380	$	4	$	4	$	35,967	$	32,038

Estimated benefit payments


$ in millions	Pension Plans		Medical and Life Plans		Total
Year Ending December 31
2021	$	1,884	$	152	$	2,036
2022	1,930		153		2,083
2023	1,973		135		2,108
2024	2,017		133		2,150
2025	2,057		130		2,187
2026 through 2030	10,599		556		11,155

Stock Compensation Plans and Other Compensation Arrangements (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Stock Award Rollforward Activity


	Stock Awards (in thousands)	Weighted- Average Grant Date Fair Value Per Share		Weighted- Average Remaining Contractual Term (in years)
Outstanding at January 1, 2018	938	$	192	1.0
Granted	376	321
Vested	(455)	181
Forfeited	(63)	250
Outstanding at December 31, 2018	796	$	244	0.8
Granted	339	274
Vested	(383)	222
Forfeited	(51)	280
Outstanding at December 31, 2019	701	$	278	0.9
Granted	262	350
Vested	(296)	305
Forfeited	(64)	303
Outstanding at December 31, 2020	603	$	311	1.4

Cash Units and Cash Performance Units Aggregate Payout Amount [Table Text Block]

The following table presents the minimum and maximum aggregate payout amounts related to those cash awards granted for the periods presented:


	Year Ended December 31
$ in millions	2020		2019		2018
Minimum aggregate payout amount	$	31	$	36	$	36
Maximum aggregate payout amount	175		203		205

Leases Leases (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Lease, Cost [Table Text Block]

Total lease cost is comprised of the following:


	Year Ended December 31
$ in millions	2020		2019
Operating lease cost	$	320	$	318
Variable lease cost	28		11
Short-term lease cost	93		75
Total lease cost	$	441	$	404

Rental expense for operating leases classified under ASC 840 for the year ended December 31, 2018 was $375 million. This amount is net of immaterial amounts of sublease income.

Supplemental Balance Sheet Disclosures [Text Block]

Supplemental operating lease balance sheet information consists of the following:


	Year Ended December 31
$ in millions	2020		2019
Operating lease right-of-use assets	$	1,533	$	1,511

Other current liabilities	263		261
Operating lease liabilities	1,343		1,308
Total operating lease liabilities	$	1,606	$	1,569

Other Supplemental Lease Information [Table Text Block]

Other supplemental operating lease information consists of the following:


	Year Ended December 31
$ in millions	2020			2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	275		$	307
Right-of-use assets obtained in exchange for new lease liabilities	345			462

Weighted average remaining lease term	12.1 years			11.6 years
Weighted average discount rate	3.5		%	3.8		%

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Maturities of operating lease liabilities as of December 31, 2020 are as follows:


$ in millions
Year Ending December 31
2021	$	298
2022	267
2023	228
2024	185
2025	142
Thereafter	902
Total lease payments	2,022
Less: imputed interest	(416)
Present value of operating lease liabilities	$	1,606

Segment Information (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Sales and operating income by segment

The following table presents sales and operating income by segment:


	Year Ended December 31
$ in millions	2020		2019		2018
Sales
Aeronautics Systems	$	12,169	$	11,116	$	10,293
Defense Systems	7,543		7,495		6,612
Mission Systems	10,080		9,410		8,949
Space Systems	8,744		7,425		5,845
Intersegment eliminations	(1,737)		(1,605)		(1,604)
Total sales	36,799		33,841		30,095
Operating income
Aeronautics Systems	1,206		1,188		1,128
Defense Systems	846		793		697
Mission Systems	1,459		1,408		1,245
Space Systems	893		794		644
Intersegment eliminations	(216)		(205)		(200)
Total segment operating income	4,188		3,978		3,514
Net FAS (service)/CAS pension adjustment	418		465		613
Unallocated corporate expense	(541)		(474)		(347)
Total operating income	$	4,065	$	3,969	$	3,780

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]


Sales by Customer Type	Year Ended December 31
	2020				2019				2018
$ in millions	$		%(3)		$		%(3)		$		%(3)
Aeronautics Systems
U.S. government (1)	$	10,411	86	%	$	9,258	83	%	$	8,732	85	%
International (2)	1,595		13	%	1,688		15	%	1,402		13	%
Other customers	41		—	%	67		1	%	86		1	%
Intersegment sales	122		1	%	103		1	%	73		1	%
Aeronautics Systems sales	12,169		100	%	11,116		100	%	10,293		100	%
Defense Systems
U.S. government (1)	5,103		68	%	4,952		66	%	4,132		62	%
International (2)	1,317		17	%	1,442		19	%	1,249		19	%
Other customers	395		5	%	410		6	%	481		7	%
Intersegment sales	728		10	%	691		9	%	750		12	%
Defense Systems sales	7,543		100	%	7,495		100	%	6,612		100	%
Mission Systems
U.S. government (1)	7,279		72	%	6,765		72	%	6,501		73	%
International (2)	1,945		19	%	1,839		19	%	1,653		18	%
Other customers	77		1	%	78		1	%	77		1	%
Intersegment sales	779		8	%	728		8	%	718		8	%
Mission Systems sales	10,080		100	%	9,410		100	%	8,949		100	%
Space Systems
U.S. government (1)	8,110		93	%	6,959		94	%	5,431		93	%
International (2)	331		4	%	185		2	%	130		2	%
Other customers	195		2	%	198		3	%	221		4	%
Intersegment sales	108		1	%	83		1	%	63		1	%
Space Systems sales	8,744		100	%	7,425		100	%	5,845		100	%
Total
U.S. government (1)	30,903		84	%	27,934		83	%	24,796		82	%
International (2)	5,188		14	%	5,154		15	%	4,434		15	%
Other customers	708		2	%	753		2	%	865		3	%
Total Sales	$	36,799	100	%	$	33,841	100	%	$	30,095	100	%

(3) Percentages calculated based on total segment sales.

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]


Sales by Contract Type	Year Ended December 31
	2020				2019				2018
$ in millions	$		%(1)		$		%(1)		$		%(1)
Aeronautics Systems
Cost-type	$	6,142	51	%	$	5,299	48	%	$	5,066	50	%
Fixed-price	5,905		49	%	5,714		52	%	5,154		50	%
Intersegment sales	122				103				73
Aeronautics Systems sales	12,169				11,116				10,293
Defense Systems
Cost-type	2,345		34	%	2,509		37	%	2,386		41	%
Fixed-price	4,470		66	%	4,295		63	%	3,476		59	%
Intersegment sales	728				691				750
Defense Systems sales	7,543				7,495				6,612
Mission Systems
Cost-type	3,582		39	%	3,335		38	%	3,099		38	%
Fixed-price	5,719		61	%	5,347		62	%	5,132		62	%
Intersegment sales	779				728				718
Mission Systems sales	10,080				9,410				8,949
Space Systems
Cost-type	6,369		74	%	5,336		73	%	4,453		77	%
Fixed-price	2,267		26	%	2,006		27	%	1,329		23	%
Intersegment sales	108				83				63
Space Systems sales	8,744				7,425				5,845
Total
Cost-type	18,438		50	%	16,479		49	%	15,004		50	%
Fixed-price	18,361		50	%	17,362		51	%	15,091		50	%
Total Sales	$	36,799			$	33,841			$	30,095

(1)Percentages calculated based on external customer sales.

Revenue from External Customers by Geographic Areas [Table Text Block]


Sales by Geographic Region	Year Ended December 31
	2020				2019				2018
$ in millions	$		%(2)		$		%(2)		$		%(2)
Aeronautics Systems
United States	$	10,452	87	%	$	9,325	85	%	$	8,818	86	%
Asia/Pacific	841		7	%	810		7	%	677		7	%
Europe	574		5	%	587		5	%	536		5	%
All other (1)	180		1	%	291		3	%	189		2	%
Intersegment sales	122				103				73
Aeronautics Systems sales	12,169				11,116				10,293
Defense Systems
United States	5,498		81	%	5,362		79	%	4,613		79	%
Asia/Pacific	402		6	%	369		5	%	365		6	%
Europe	315		4	%	249		4	%	204		3	%
All other (1)	600		9	%	824		12	%	680		12	%
Intersegment sales	728				691				750
Defense Systems sales	7,543				7,495				6,612
Mission Systems
United States	7,356		79	%	6,843		79	%	6,578		80	%
Asia/Pacific	707		8	%	637		7	%	592		7	%
Europe	893		9	%	850		10	%	682		8	%
All other (1)	345		4	%	352		4	%	379		5	%
Intersegment sales	779				728				718
Mission Systems sales	10,080				9,410				8,949
Space Systems
United States	8,305		96	%	7,157		98	%	5,652		98	%
Asia/Pacific	18		—	%	20		—	%	32		—	%
Europe	300		4	%	147		2	%	92		2	%
All other (1)	13		—	%	18		—	%	6		—	%
Intersegment sales	108				83				63
Space Systems sales	8,744				7,425				5,845
Total
United States	31,611		86	%	28,687		85	%	25,661		85	%
Asia/Pacific	1,968		5	%	1,836		6	%	1,666		6	%
Europe	2,082		6	%	1,833		5	%	1,514		5	%
All other (1)	1,138		3	%	1,485		4	%	1,254		4	%
Total Sales	$	36,799			$	33,841			$	30,095

(1)All other is principally comprised of the Middle East.

(2)Percentages calculated based on external customer sales.

Intersegment sales and operating income

The following table presents intersegment sales and operating income before eliminations:


	Year Ended December 31
$ in millions	2020					2019					2018
	Sales		Operating Income			Sales		Operating Income			Sales		Operating Income
Intersegment sales and operating income
Aeronautics Systems	$	122		$	11	$	103		$	10	$	73		$	8
Defense Systems	728			76		691			74		750			74
Mission Systems	779			116		728			113		718			115
Space Systems	108			13		83			8		63			3
Total	$	1,737		$	216	$	1,605		$	205	$	1,604		$	200

Total assets by segment

The following table presents assets by segment:


	December 31
$ in millions	2020		2019
Assets
Aeronautics Systems	$	8,997	$	9,104
Defense Systems	7,352		7,420
Mission Systems	10,029		9,934
Space Systems	10,028		10,595

Corporate assets(1)	8,063		4,036
Total assets	$	44,469	$	41,089

Additional information by segment

The following table presents capital expenditures and depreciation and amortization by segment:


	Year Ended December 31
$ in millions	2020		2019		2018		2020		2019		2018
	Capital Expenditures						Depreciation and Amortization(1)
Aeronautics Systems	$	540	$	528	$	657	$	238	$	224	$	190
Defense Systems	78		71		66		48		44		65
Mission Systems	302		229		197		150		133		121
Space Systems	440		352		226		211		189		130
Corporate	60		84		103		358		428		294
Total	$	1,420	$	1,264	$	1,249	$	1,005	$	1,018	$	800

Unaudited Selected Quarterly Data (Tables)

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]


2020
In millions, except per share amounts	1st Qtr		2nd Qtr		3rd Qtr		4th Qtr
Sales	$	8,620	$	8,884	$	9,083	$	10,212
Operating income	934		994		985		1,152
Net earnings	868		1,005		986		330

Basic earnings per share	5.18		6.02		5.91		1.98
Diluted earnings per share	5.15		6.01		5.89		1.97

Weighted-average common shares outstanding	167.7		166.9		166.8		166.8
Weighted-average diluted shares outstanding	168.4		167.3		167.3		167.4


2019
In millions, except per share amounts	1st Qtr		2nd Qtr		3rd Qtr		4th Qtr
Sales	$	8,189	$	8,456	$	8,475	$	8,721
Operating income	936		946		951		1,136
Net earnings (loss)	863		861		933		(409)

Basic earnings (loss) per share	5.08		5.07		5.52		(2.43)
Diluted earnings (loss) per share(1)	5.06		5.06		5.49		(2.43)

Weighted-average common shares outstanding	170.0		169.7		169.1		168.4
Weighted-average diluted shares outstanding(1)	170.7		170.3		169.9		168.4

Amounts in Paragraphs - Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 07, 2020
Summary of Significant Accounting Policies (Amounts in paragraphs)
Research and development expenses	$ 764	$ 1,100	$ 953
Research and Development as a Percent of Sales	2.50%	2.90%	2.80%
Cash surrender value of life insurance		$ 419	$ 380
Stock plans, vesting period		3 years
Disposal Group, Including Discontinued Operation, Consideration					$ 3,400
Revenue from Sale of Equipment to a Customer		$ 444
Proceeds from Sale of Equipment to a Customer		205	0	$ 0
Non-Cash Proceeds from sale of equipment to a customer		239
Capital Expenditures Incurred but Not yet Paid		$ 72	$ 166	$ 185

Summary of Significant Accounting Policies Property, Plant and Equipment (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 13,406	$ 12,762
Accumulated depreciation	(6,335)	(5,850)
Property, plant, and equipment, net	7,071	6,912
Land and land improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	628	619
Buildings and improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	2,762	2,575
Machinery and other equipment
Property, Plant and Equipment
Property, plant and equipment, at cost	7,206	6,997
Capitalized software costs
Property, Plant and Equipment
Property, plant and equipment, at cost	602	606
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 2,208	$ 1,965
Minimum \| Capitalized software costs
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	3 years
Maximum [Member] \| Land and land improvements
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	40 years
Maximum [Member] \| Buildings and improvements
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	45 years
Maximum [Member] \| Machinery and other equipment
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	20 years
Maximum [Member] \| Capitalized software costs
Property, Plant and Equipment
Property, plant and equipment, estimated useful life	5 years

Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details 3) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Loss
Unamortized prior service credit, net of tax expense of $3 for 2020 and $17 for 2019	$ 10	$ 51
Cumulative translation adjustment and other, net	(138)	(148)
Total accumulated other comprehensive loss	(128)	(97)
Prior Service Credit Tax Expense	$ 3	$ 17

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Summary of Significant Accounting Policies Contract Estimates (Details 4) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended									12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in Accounting Estimate [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period										$ 504	$ 538	$ 631
Operating income	$ 1,152	$ 985	$ 994	$ 934	$ 1,136	$ 951	$ 946	$ 936		4,065	3,969	3,780
Net earnings	$ 330	$ 986	$ 1,005	$ 868	$ (409)	$ 933	$ 861	$ 863		$ 3,189	$ 2,248	$ 3,229
Diluted earnings per share	$ 1.97	$ 5.89	$ 6.01	$ 5.15	$ (2.43)	$ 5.49	$ 5.06	$ 5.06		$ 19.03	$ 13.22	$ 18.49
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income										$ 466	$ 480	$ 577
Net earnings										$ 368	$ 379	$ 456
Diluted earnings per share										$ 2.20	$ 2.23	$ 2.61
Aeronautics Systems \| Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income									$ 69

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Summary of Significant Accounting Policies Backlog and Contract Assets and Liabilities (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 81,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation	We expect to recognize approximately 40 percent and 60 percent of our December 31, 2020 backlog as revenue over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter.
Unbilled Receivables, Current	$ 5,140	$ 5,334
Amount of increase (decrease) in Unbilled Receivables	$ (194)
Percent increase (decrease) in Unbilled Receivables	(4.00%)
Contract with Customer, Liability, Current	$ (2,517)	(2,237)
Amount of decrease (increase) in Contract with Customer, Liability, Current	$ (280)
Percent decrease (increase) in Contract with Customer, Liability, Current	13.00%
Contract with Customer, Asset, Net, Current	$ 2,623	3,097
Amount of increase (decrease) in net contract assets (liabilities)	$ (474)
Percent increase (decrease) in net contract assets (liabilities)	(15.00%)
Contract with Customer, Liability, Revenue Recognized	$ 1,600	$ 1,300	$ 1,300

Acquisition of Orbital ATK Operating Results Post Acquisition (Details 1) - USD ($) $ in Millions		3 Months Ended								7 Months Ended	12 Months Ended
	Jun. 06, 2018	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 7,742
Revenues		$ 10,212	$ 9,083	$ 8,884	$ 8,620	$ 8,721	$ 8,475	$ 8,456	$ 8,189		$ 36,799	$ 33,841	$ 30,095
Operating Income (Loss)		1,152	985	994	934	1,136	951	946	936		4,065	3,969	3,780
Net earnings		$ 330	$ 986	$ 1,005	$ 868	$ (409)	$ 933	$ 861	$ 863		3,189	2,248	3,229
Business Combination, Acquisition Related Costs												29
Operating Segments [Member]
Business Acquisition [Line Items]
Operating Income (Loss)											4,188	3,978	3,514
Operating Segments [Member] \| Space Systems
Business Acquisition [Line Items]
Revenues										$ 3,100	8,744	7,425	5,845
Operating Income (Loss)										342	$ 893	$ 794	$ 644
Net earnings										$ 273

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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-Paragraph 3
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 28
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Acquisition of Orbital ATK Purchase Price Allocation (Details 2) - USD ($) $ / shares in Units, $ in Millions	Jun. 06, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 17,518	$ 18,708	$ 18,672
Shares of Orbital ATK common stock outstanding as of the Merger date	57,562,152
Cash consideration per share of Orbital ATK common stock	$ 134.50
Total purchase price	$ 7,742
Orbital ATK [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	85
Accounts receivable	596
Unbilled receivables	1,237
Inventoried costs	220
Other current assets	237
Property, plant and equipment	1,509
Goodwill	6,259
Intangible assets	1,525
Other non-current assets	151
Total assets acquired	11,819
Trade accounts payable	(397)
Accrued employee compensation	(158)
Advance payments and billings in excess of costs incurred	(222)
Below market contracts(1)	(151)
Other current liabilities	(412)
Long-term debt	(1,687)
Pension and OPB plan liabilities	(613)
Deferred tax liabilities	(248)
Other non-current liabilities	(189)
Total liabilities assumed	(4,077)
Total purchase price	$ 7,742

Acquisition of Orbital ATK Acquired Purchased Intangbile Assets (Details 3) - USD ($) $ in Millions	Jun. 06, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 17,518	$ 18,708	$ 18,672
Goodwill		$ 17,518	$ 18,708	$ 18,672
Orbital ATK [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1,525
Goodwill	6,259
Goodwill	$ 6,259
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 280
Customer Contracts [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1,245

Acquisition of Orbital ATK Pro Forma Financial Information (Details 4) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares
Business Combinations [Abstract]
Business Acquisition, Pro Forma Revenue	$ 32,319
Business Acquisition, Pro Forma Net Income (Loss)	$ 3,417
Business Acquisition, Pro Forma Earnings Per Share, Diluted \| $ / shares	$ 19.57
Pro Forma Adjustments, Orbital ATK intercompany sales elimination	$ 80
Pro Forma Adjustments, Elimination of nonrecurring transaction costs	71
Pro Forma Adjustments, Additional depreciation expense, net of removal of historical depreciation	8
Pro Forma Adjustments, Additional amortization expense, net of removal of historical amortization expense	90
Pro Forma Adjustments, Elimination of Orbital ATK’s historical amortization of net actuarial losses and prior service credits and revised pension and other post-retirement costs	51
Income Tax Effects of Pro Forma Adjustments	$ (5)

Disposition of IT and Mission Support Services (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 07, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Group
Accounts receivable, net	$ 110
Unbilled receivables, net	269
Other current assets	9
Property, plant and equipment	14
Operating lease right-of-use assets	38
Goodwill	1,195
Total assets of disposal group held for sale	1,635
Trade accounts payable	(99)
Accrued employee compensation	(59)
Advance payments and billings in excess of costs incurred	(31)
Other current liabilities	(42)
Non-current operating lease liabilities	27
Total liabilities of disposal group held for sale	(258)
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax	$ 247	$ 245	$ 288
Disposal Group, Including Discontinued Operation, Consideration				$ 3,400

Earnings Per Share, Share Repurchases and Dividends on Common Stock Share Repurchases (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended			25 Months Ended	59 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Feb. 29, 2020	Jan. 25, 2021	Dec. 04, 2018	Sep. 16, 2015
Stock Repurchase [Line Items]
Shares Repurchased	1.4	3.2	3.8
September 2015 Share Repurchase Original Authorization
Stock Repurchase [Line Items]
Amount Authorized								$ 4,000
Total Shares Retired					15.4
Average Price Per Share					$ 260.33
Shares Repurchased	0.9	3.2	3.8
December 2018 Share Repurchase Program Original Authorization
Stock Repurchase [Line Items]
Amount Authorized							$ 3,000
Total Shares Retired				0.5
Average Price Per Share				$ 326.20
Shares Repurchased	0.5	0.0	0.0
Amount repurchased				$ 200
Amount remaining under authorization for share repurchases	$ 2,800			$ 2,800
January 2021 Share Repurchase Program [Member] \| Subsequent Event [Member]
Stock Repurchase [Line Items]
Amount Authorized						$ 3,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased						5,800.0

Earnings Per Share, Share Repurchases and Dividends on Common Stock (Details 2) - $ / shares shares in Millions	1 Months Ended					12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018	Jan. 31, 2018	May 30, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Common stock dividend (in dollars per share)	$ 1.45	$ 1.32	$ 1.20	$ 1.10	$ 1.00	$ 5.67	$ 5.16	$ 4.70
Increase (Decrease) in Stock Dividend, Percentage	10.00%		9.00%	10.00%
Earnings Per Share, Basic and Diluted [Abstract]
Dilutive effect of stock options and other stock awards granted						0.5	0.7	0.9
Increase (Decrease) in Stock Dividend, Percentage	10.00%		9.00%	10.00%
Common stock dividend (in dollars per share)	$ 1.45	$ 1.32	$ 1.20	$ 1.10	$ 1.00	$ 5.67	$ 5.16	$ 4.70

Accounts Receivable, Net (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, after Allowance for Credit Loss [Abstract]
Accounts receivable, gross	$ 1,534	$ 1,359
Allowance for expected credit losses	(33)	(33)
Accounts receivable, net	1,501	1,326
US Government [Member]
Accounts Receivable, after Allowance for Credit Loss [Abstract]
Accounts receivable, gross	956	1,030
International and Other Customers [Member]
Accounts Receivable, after Allowance for Credit Loss [Abstract]
Accounts receivable, gross	$ 578	$ 329

Unbilled Receivables, Net (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivable, net of progress and performance-based payments received	$ 5,180	$ 5,379
Allowance for expected credit losses	(40)	(45)
Unbilled receivables, net	5,140	5,334
US Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	19,315	17,347
Government Contract Receivable, Progress Payment Offset	14,615	12,838
Unbilled receivable, net of progress and performance-based payments received	4,700	4,509
International and Other Customers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	3,361	4,063
Progress and performance-based payments received	(2,881)	(3,193)
Unbilled receivable, net of progress and performance-based payments received	$ 480	$ 870

Inventoried Costs, Net (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Production costs of contracts in process	$ 451	$ 476
General and administrative expenses	41	31
Inventoried costs	492	507
Progress and performance-based payments received	(62)	(41)
Inventoried costs, net of progress payments	430	466
Product inventory	329	317
Inventory, Net	$ 759	$ 783

Income Taxes Federal and Foreign Income Tax Expense (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes on Continuing Operations (Table Amounts)
Current federal income tax expense (benefit)	$ 246	$ 758	$ 292
Deferred federal income tax expense (benefit)	288	(474)	213
Total federal income tax expense (benefit)	534	284	505
Current foreign income tax expense (benefit)	3	10	7
Deferred foreign income tax expense (benefit)	2	6	1
Total foreign income tax expense (benefit)	5	16	8
Total federal and foreign income tax expense	$ 539	$ 300	$ 513

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Income Taxes Effective Income Tax Rate Reconciliation (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Reconciliation (Table Amounts) [Abstract]
Income tax expense at statutory rate	$ 783	$ 535	$ 786
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Stock compensation - excess tax benefits	$ (10)	$ (14)	$ (27)
Stock compensation - excess tax benefits, Percent	(0.20%)	(0.50%)	(0.70%)
Research credit	$ (206)	$ (216)	$ (186)
Research credit, Percent	(5.50%)	(8.50%)	(5.00%)
Foreign derived intangible income	$ (55)	$ (28)	$ (16)
Foreign derived intangible income, Percent	(1.50%)	(1.10%)	(0.40%)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount	$ 0	$ 0	$ (84)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent	0	0	(0.022)
Other, net	$ 27	$ 23	$ 40
Other net, Percent	0.70%	0.90%	1.00%
Total federal and foreign income tax expense	$ 539	$ 300	$ 513
Effective income tax rate	14.50%	11.80%	13.70%

Income Taxes Unrecognized Tax Benefits (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 144
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	607
Unrecognized Tax Benefits Rollforward (Table Amounts) [Abstract]
Unrecognized tax benefits at beginning of the year	1,223	$ 748	$ 283
Additions based on tax positions related to the current year	187	158	293
Additions for tax positions of prior years	270	400	207
Reductions for tax positions of prior years	(190)	(65)	(23)
Settlements with taxing authorities	(7)	(15)	(7)
Other, net	(2)	(3)	(5)
Net change in unrecognized tax benefits	258	475	465
Unrecognized tax benefits at end of the year	$ 1,481	$ 1,223	$ 748

Income Taxes Deferred Income Taxes (Details 4) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets (Table Amounts)
Retiree benefits	$ 1,738	$ 1,827
Accrued employee compensation	360	336
Provisions for accrued liabilities	232	166
Inventory	849	684
Stock-based compensation	40	38
Operating lease liabilities	435	411
Tax credits	343	166
Other	112	73
Gross deferred tax assets	4,109	3,701
Less: valuation allowance	(307)	(160)
Net deferred tax assets	3,802	3,541
Deferred Tax Liabilities (Table Amounts)
Goodwill	533	515
Purchased intangibles	201	262
Property, plant and equipment, net	737	584
Operating lease right-of-use assets	423	404
Contract accounting differences	1,513	1,225
Other	84	43
Deferred tax liabilities	3,491	3,033
Total net deferred tax assets	$ 311	$ 508

Amounts in Paragraphs - Income Taxes (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	14.50%	11.80%	13.70%
Significant matters affecting comparability	(1.30%)	(3.70%)	(1.10%)
Increase in Research Tax Credit		$ 30	$ 12
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount	$ 0	0	(84)
Income taxes paid, net	312	324	$ 270
Tax Credit Carryforward, Amount	419
Operating Loss Carryforwards	364
Tax Credit Carryforward, Valuation Allowance	221
Operating Loss Carryforwards, Valuation Allowance	31
Income Taxes Receivable	$ 792	$ 551

Goodwill and Other Purchased Intangible Assets Goodwill Rollforward (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill (Table Amounts)
Beginning balance	$ 18,708	$ 18,672
Acquisition of Orbital ATK		37
Reclassification to assets of disposal group held for sale	(1,195)
Other	5	(1)
Ending balance	17,518	18,708
Aeronautics Systems
Goodwill (Table Amounts)
Beginning balance	3,467	3,467
Acquisition of Orbital ATK		0
Reclassification to assets of disposal group held for sale	0
Other	0	0
Ending balance	3,467	3,467
Defense Systems
Goodwill (Table Amounts)
Beginning balance	4,376	4,377
Acquisition of Orbital ATK		0
Reclassification to assets of disposal group held for sale	(966)
Other	5	(1)
Ending balance	3,415	4,376
Mission Systems
Goodwill (Table Amounts)
Beginning balance	6,062	6,062
Acquisition of Orbital ATK		0
Reclassification to assets of disposal group held for sale	(181)
Other	0	0
Ending balance	5,881	6,062
Space Systems
Goodwill (Table Amounts)
Beginning balance	4,803	4,766
Acquisition of Orbital ATK		37
Reclassification to assets of disposal group held for sale	(48)
Other	0	0
Ending balance	$ 4,755	$ 4,803

Goodwill and Other Purchased Intangible Assets Other Purchased Intangible Assets (Details 2) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Gross customer-related and other intangible assets	$ 3,362	$ 3,356
Less accumulated amortization	(2,579)	(2,316)
Net contract, program and other intangible assets	$ 783	$ 1,040

Goodwill and Other Purchased Intangible Assets Future Amortization of Purchased Intangibles (Details 3) $ in Millions	Dec. 31, 2020 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2021	$ 205
2022	197
2023	79
2024	56
2025	$ 44

Goodwill and Other Purchased Intangible Assets Amounts in Paragraphs - Goodwill and Other Purchased Intangible Assets (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Amortization of Intangible Assets	$ 262	$ 332	$ 203
Aeronautics Systems
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	417	417
Space Systems
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	$ 153	$ 153

Fair Value of Financial Instruments (Details 1) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 396	$ 382
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	377	364
Derivative Assets (Liabilities), at Fair Value, Net	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	1	1
Derivative Assets (Liabilities), at Fair Value, Net	0	(3)
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	378	365
Derivative Assets (Liabilities), at Fair Value, Net	0	(3)
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	377	364
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	1	1
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 18	$ 17

Fair Value of Financial Instruments Amounts in Paragraphs - Fair Value of Financial Instruments (Details 2) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	$ 133	$ 98
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net	$ 0	$ 7

Debt Fixed-rate Notes and Other (Details 1) £ in Millions, $ in Millions	Dec. 31, 2020 USD ($)	Dec. 01, 2020 USD ($)	Dec. 01, 2020 GBP (£)	Mar. 23, 2020 Rate	Dec. 31, 2019 USD ($)
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt	$ 15,003
Other long-term debt	235				$ 272
Debt issuance costs	(75)				(64)
Total long-term debt	15,003				13,879
Less: current portion	742				1,109
Long-term Debt and Lease Obligation	$ 14,261				12,770
2020
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	2.08%
Long-term debt	$ 0				1,000
2021
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Long-term debt	$ 700				700
2022
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	2.55%
Long-term debt	$ 1,500				1,500
2023
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Long-term debt	$ 1,050				1,050
2025
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	2.93%
Long-term debt	$ 1,500				1,500
2026
Long-Term Debt (Table Amounts) [Abstract]
Long-term debt	$ 527				527
2027
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.20%
Long-term debt	$ 750				750
2028
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Long-term debt	$ 2,000				2,000
2031
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	7.75%
Long-term debt	$ 466				466
2040
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage \| Rate				5.15%
Long-term debt	$ 800				300
2043
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Long-term debt	$ 950				950
2045
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.85%
Long-term debt	$ 600				600
2047
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.03%
Long-term debt	$ 2,250				2,250
Two Year Term [Member] [Domain]
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	1.89%
Credit facilities	$ 0	$ 68	£ 50		78
Two Thousand Fifty
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.25%			5.25%
Long-term debt	$ 1,000				0
Two Thousand Thirty
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.40%			4.40%
Long-term debt	$ 750				$ 0
Minimum \| 2026
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	7.75%
Minimum \| 2040
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.05%
Maximum \| 2026
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	7.88%
Maximum \| 2040
Long-Term Debt (Table Amounts) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.15%

Debt Maturities of Long-term Debt (Details 2) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Maturities of Long-term Debt [Abstract]
2021	$ 742
2022	1,505
2023	1,053
2024	3
2025	1,503
Thereafter	10,285
Total principal payments	15,091
Unamortized premium on long-term debt, net of discount	(13)
Debt issuance costs	(75)	$ (64)
Total long-term debt	$ 15,003

Amounts in Paragraphs - Debt (Details 3) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 GBP (£)	Dec. 01, 2020 USD ($)	Dec. 01, 2020 GBP (£)	Mar. 23, 2020 USD ($) Rate
Debt Instrument [Line Items]
Credit Facility, Covenant Terms, Maximum Debt to Capitalization Ratio	The company also cannot permit the ratio of its debt to capitalization (as set forth in the credit agreements) to exceed 65 percent.
Line of Credit Facility, Covenant Compliance	the company was in compliance with all covenants under its credit agreements.
Long-term Debt, Fair Value	$ 18,200	$ 15,100
Interest paid, net of interest received	572	521	$ 456
Five Year Term [Member] [Domain]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,000
Credit facilities	0
Two Year Term [Member] [Domain]
Debt Instrument [Line Items]
Credit facilities	$ 0	$ 78			$ 68	£ 50
Debt Instruments [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	1.89%			1.89%
Two Thousand Thirty
Debt Instruments [Abstract]
Debt Instrument, Face Amount							$ 750
Debt Instrument, Interest Rate, Stated Percentage	4.40%			4.40%			4.40%
Two Thousand Forty [Member]
Debt Instruments [Abstract]
Debt Instrument, Face Amount							$ 500
Debt Instrument, Interest Rate, Stated Percentage \| Rate							5.15%
Two Thousand Fifty
Debt Instruments [Abstract]
Debt Instrument, Face Amount							$ 1,000
Debt Instrument, Interest Rate, Stated Percentage	5.25%			5.25%			5.25%
Revolving Credit Facility [Member] \| Two Year Term [Member] [Domain]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 163			£ 120
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial Paper, Maximum Borrowing Capacity	2,000
Short-term Debt	$ 0

Investigations, Claims and Litigation Investigations, Claims and Litigation (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2007	Dec. 31, 2020	Feb. 16, 2018	May 04, 2012
United States Postal Service [Member]
Loss Contingencies [Line Items]
CounterclaimForDamagesSought			$ 193
Unpaid Portions of Contract Price and Direct Costs Incurred [Member] \| United States Postal Service [Member]
Loss Contingencies [Line Items]
Receivables, unpaid long-term contracts				$ 63
Acts and Omissions with Adverse Affects on Performance and Obligations [Member] \| United States Postal Service [Member]
Loss Contingencies [Line Items]
Gain Contingency, Unrecorded Amount				$ 115
United States Postal Service [Member]
Loss Contingencies [Line Items]
Contract award	$ 875
Maximum [Member] \| United States Postal Service [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		$ 410

Commitments and Contingencies (Details 1) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Amounts accrued for probable environmental remediation costs	$ 614	$ 531
Loss Contingency, Range of Possible Loss, Portion Not Accrued	346	448
Recorded Third-Party Environmental Recoveries, Amount	529	$ 436
Financial Arrangements (Amounts in Paragraph)
Unused standby letters of credit and bank guarantees	456
Surety Bond Outstanding	94
Other Current Liabilities [Member]
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Amounts accrued for probable environmental remediation costs	237
Other Noncurrent Liabilities [Member]
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Amounts accrued for probable environmental remediation costs	377
Prepaid Expenses and Other Current Assets [Member]
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Recorded Third-Party Environmental Recoveries, Amount	210
Other Noncurrent Assets [Member]
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Recorded Third-Party Environmental Recoveries, Amount	$ 319

Retirement Benefits Net Periodic Benefit Cost (Benefit) (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of Net Periodic Benefit Cost (Table Amounts) [Abstract]
Mark-to-market expense (benefit)	$ (1,034)	$ (1,800)	$ (655)
Pension Benefits
Components of Net Periodic Benefit Cost (Table Amounts) [Abstract]
Service cost	409	367	404
Interest cost	1,226	1,360	1,226
Expected return on plan assets	(2,376)	(2,101)	(2,217)
Amortization of prior service cost (credit)	(59)	(59)	(58)
Mark-to-market expense (benefit)	(1,034)	(1,783)	(699)
Other	10	0	0
Net periodic benefit cost (benefit)	244	1,350	54
Medical and Life Benefits
Components of Net Periodic Benefit Cost (Table Amounts) [Abstract]
Service cost	17	16	21
Interest cost	67	80	76
Expected return on plan assets	(102)	(92)	(101)
Amortization of prior service cost (credit)	4	(3)	(21)
Mark-to-market expense (benefit)	0	(17)	44
Other	2	0	0
Net periodic benefit cost (benefit)	$ (12)	$ 18	$ (69)

Retirement Benefits Unamortized Prior Service Credit Rollforward (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amortization of:
Prior service credit	$ 55	$ 62	$ 79
Tax expense (benefit) related to above items	(14)	(15)	(19)
Change in unamortized benefit plan costs	41	47	60
Pension Benefits
Amortization of:
Prior service credit	59	59	58
Tax expense (benefit) related to above items	(15)	(14)	(14)
Change in unamortized benefit plan costs	44	45	44
Medical and Life Benefits
Amortization of:
Prior service credit	(4)	3	21
Tax expense (benefit) related to above items	1	(1)	(5)
Change in unamortized benefit plan costs	$ (3)	$ 2	$ 16

Retirement Benefits Funded Status of Plan Assets (Liabilities) (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in plan assets
Fair value of plan assets at beginning of year	$ 32,038
Fair value of plan assets at end of year	35,967	$ 32,038
Amounts Recognized on the Balance Sheet
Non-current liability	(6,498)	(6,979)
Pension Benefits
Change in plan assets
Fair value of plan assets at beginning of year	30,646	27,150
Net gain on plan assets	4,802	5,025
Employer contributions	851	221
Participant contributions	8	8
Benefits paid	(1,865)	(1,763)
Acquired plan assets	0	0
Other	10	5
Fair value of plan assets at end of year	34,452	30,646	$ 27,150
Change in projected benefit obligation
Projected benefit obligation at beginning of year	36,914	32,231
Service cost	409	367	404
Interest cost	1,226	1,360	1,226
Participant contributions	8	8
Actuarial loss	3,455	4,708
Benefits paid	(1,865)	(1,763)
Acquired benefit obligation	0	0
Other	35	3
Projected benefit obligation at end of year	40,182	36,914	32,231
Funded status	(5,730)	(6,268)
Amounts Recognized on the Balance Sheet
Non-current assets	211	124
Current liability	(180)	(173)
Non-current liability	(5,761)	(6,219)
Medical and Life Benefits
Change in plan assets
Fair value of plan assets at beginning of year	1,392	1,247
Net gain on plan assets	218	234
Employer contributions	36	42
Participant contributions	24	24
Benefits paid	(155)	(156)
Acquired plan assets	0	0
Other	0	1
Fair value of plan assets at end of year	1,515	1,392	1,247
Change in projected benefit obligation
Projected benefit obligation at beginning of year	2,048	1,930
Service cost	17	16	21
Interest cost	67	80	76
Participant contributions	24	24
Actuarial loss	115	159
Benefits paid	(155)	(156)
Acquired benefit obligation	0	0
Other	3	(5)
Projected benefit obligation at end of year	2,119	2,048	$ 1,930
Funded status	(604)	(656)
Amounts Recognized on the Balance Sheet
Non-current assets	179	151
Current liability	(46)	(47)
Non-current liability	$ (737)	$ (760)

Retirement Benefits Accumulated Benefit Obligations in Excess of Fair Value (Details 4) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Pension plans with accumulated benefit obligations in excess of fair value of plan assets (Table Amounts) [Abstract]
Projected benefit obligation	$ 37,681	$ 34,715
Accumulated benefit obligation	37,135	34,305
Fair value of plan assets	$ 31,741	$ 28,324

Retirement Benefits Plan Assumptions (Details 5)	12 Months Ended
Retirement Benefits Plan Assumptions (Details 5)	Dec. 31, 2020	Dec. 31, 2019
Benefit Obligation [Member]
Defined Benefit Plan Disclosure (Table Amounts)
Initial health care cost trend rate assumed for the next year	5.60%	5.90%
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the health care cost trend rate reaches the ultimate trend rate	2023	2023
Pension Benefits
Assumptions Used to Determine Benefit Obligation
Discount rate	2.68%	3.39%
Initial cash balance crediting rate assumed for the next year	2.25%	2.39%
Rate to which the cash balance crediting rate is assumed to increase (the ultimate rate)	2.25%	2.64%
Year that the cash balance crediting rate reaches the ultimate rate	2026	2025
Rate of compensation increase	3.00%	3.00%
Assumptions Used to Determine Benefit Cost
Discount rate	3.39%	4.31%
Initial cash balance crediting rate assumed for the next year	2.39%	3.00%
Rate to which the cash balance crediting rate is assumed to increase (the ultimate rate)	2.64%	3.25%
Year that the cash balance crediting rate reaches the ultimate rate	2025	2024
Expected long-term return on plan assets	8.00%	8.00%
Rate of compensation increase	3.00%	3.00%
Post-retirement Benefit Cost [Member]
Defined Benefit Plan Disclosure (Table Amounts)
Initial health care cost trend rate assumed for the next year	5.90%	6.20%
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the health care cost trend rate reaches the ultimate trend rate	2023	2023
Medical and Life Benefits
Assumptions Used to Determine Benefit Obligation
Discount rate	2.58%	3.35%
Assumptions Used to Determine Benefit Cost
Discount rate	3.35%	4.30%
Expected long-term return on plan assets	7.66%	7.67%

Retirement Benefits Plan Asset Allocation (Details 6)	Dec. 31, 2020
Cash and Cash Equivalents [Member] \| Minimum
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Cash and Cash Equivalents [Member] \| Maximum [Member]
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	12.00%
Equity Securities [Member] \| Minimum
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	30.00%
Equity Securities [Member] \| Maximum [Member]
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%
Fixed income securities \| Minimum
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%
Fixed income securities \| Maximum [Member]
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%
Alternative investments \| Minimum
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	18.00%
Alternative investments \| Maximum [Member]
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	38.00%

Retirement Benefits Categorization of Plan Assets (Details 7) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	$ 35,967	$ 32,038
Cash & cash equivalents
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	1,358	2,805
U.S. Equity Securities [Member]
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	2,981	3,341
International equities
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	3,356	3,273
U.S. Treasuries
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	2,295	2,736
U.S. Government Agency
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	258	297
Non-U.S. Government
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	332	194
Corporate debt
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	6,259	4,541
Asset backed
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	1,080	892
High yield debt
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	72	134
Bank loans
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	59	33
Other
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	59	52
Notes Payable, Other Payables [Member]
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	(232)	0
Level 1
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	6,530	6,914
Level 1 \| Cash & cash equivalents
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	120	233
Level 1 \| U.S. Equity Securities [Member]
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	2,981	3,341
Level 1 \| International equities
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	3,354	3,271
Level 1 \| U.S. Treasuries
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	22	20
Level 1 \| Corporate debt
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	31	28
Level 1 \| High yield debt
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	24	30
Level 1 \| Other
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	(2)	(9)
Level 2
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	11,575	11,380
Level 2 \| Cash & cash equivalents
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	1,238	2,572
Level 2 \| U.S. Treasuries
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	2,273	2,716
Level 2 \| U.S. Government Agency
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	258	297
Level 2 \| Non-U.S. Government
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	332	194
Level 2 \| Corporate debt
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	6,228	4,513
Level 2 \| Asset backed
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	1,080	892
Level 2 \| High yield debt
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	48	104
Level 2 \| Bank loans
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	59	33
Level 2 \| Other
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	59	59
Level 3
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	4	4
Level 3 \| International equities
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	2	2
Level 3 \| Other
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	2	2
Fair Value Measured at Net Asset Value Per Share \| U.S. Equity Securities [Member]
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	1,567	1,131
Fair Value Measured at Net Asset Value Per Share \| International equities
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	7,193	5,636
Fair Value Measured at Net Asset Value Per Share \| Fixed Income Funds
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	1,959	438
Fair Value Measured at Net Asset Value Per Share \| Hedge Funds
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	65	246
Fair Value Measured at Net Asset Value Per Share \| OpportunisticFunds
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	2,499	1,459
Fair Value Measured at Net Asset Value Per Share \| Private Equity Funds [Member]
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	2,627	2,454
Fair Value Measured at Net Asset Value Per Share \| Real Estate Funds [Member]
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Fair value of plan assets	2,180	2,376
Pension and Other Post-retirement benefit plans [Member]
Plan Assets by Fair Value Measurement Input (Table Amounts) [Abstract]
Derivative Asset	29	49
Derivative Liability	(27)	(53)
Derivative, Notional Amount	$ 2,300	$ 3,600

Retirement Benefits Estimated Future Benefit Payments (Details 8) $ in Millions	Dec. 31, 2020 USD ($)
Estimated Benefit Payments (Table Amounts) [Abstract]
2021	$ 2,036
2022	2,083
2023	2,108
2024	2,150
2025	2,187
2026 through 2030	11,155
Pension Benefits
Estimated Benefit Payments (Table Amounts) [Abstract]
2021	1,884
2022	1,930
2023	1,973
2024	2,017
2025	2,057
2026 through 2030	10,599
Medical and Life Benefits
Estimated Benefit Payments (Table Amounts) [Abstract]
2021	152
2022	153
2023	135
2024	133
2025	130
2026 through 2030	$ 556

Retirement Benefits Amounts in Paragraphs - Retirement Benefits (Details 9) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plans Disclosure (Amounts in paragraphs)
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 590	$ 481	$ 403
Pension and post-retirement benefits disclosures (Amounts in paragraphs)
Accumulated benefit obligation for all defined benefit pension plans		$ 39,600	$ 36,500
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Actual Percent Return On Plan Assets		16.20%	19.10%
Yearly Discount Rate change in basis points		(71)	(92)
Pension Benefits
Defined Contribution Plans Disclosure (Amounts in paragraphs)
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 98
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 851	$ 221
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		8.00%	8.00%
Pension Benefits \| Subsequent Event [Member]
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.50%
Pension Benefits \| Voluntary Contributions [Member]
Defined Contribution Plans Disclosure (Amounts in paragraphs)
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 750
OPB contributions
Defined Contribution Plans Disclosure (Amounts in paragraphs)
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		43
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 36	$ 42
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		7.66%	7.67%
OPB contributions \| Subsequent Event [Member]
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.22%
U.S. Equity Securities [Member]
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		$ 0	$ 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency		daily, monthly or quarterly
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period		90 days
International Equity Securities [Member]
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		$ 0	0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency		daily, monthly or quarterly
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period		90 days
Fixed Income Funds
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		$ 2	0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency		daily, monthly or quarterly
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period		30 days
Hedge Funds [Member]
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		$ 9	8
OpportunisticFunds
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		1,900	1,300
Private Equity Funds [Member]
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		$ 2,300	1,900
Average investment term, alternative investments		10 years
Real Estate Funds
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		$ 60	$ 60
Average investment term, alternative investments		10 years
Minimum \| Hedge Funds [Member]
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period		5 years
Minimum \| OpportunisticFunds
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Average investment term, alternative investments		5 years
Maximum \| Hedge Funds [Member]
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period		10 years
Maximum \| OpportunisticFunds
Information About Plan Assets (Amounts in paragraphs) [Abstract]
Average investment term, alternative investments		10 years

Stock Compensation Plans Compensation Expense (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Stock-based compensation expense	$ 90	$ 127	$ 86
Tax benefits from stock-based compensation expense	14	$ 14	$ 27
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 97
Weighted-average period for unrecognized compensation expense to be charged to expense	1 year 3 months 18 days

Stock Compensation Plans Stock Awards (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation by Share-based Payment Award
Stock plans, vesting period	3 years
Stock awards, outstanding, weighted average remaining contractual terms	1 year 4 months 24 days	10 months 24 days	9 months 18 days	1 year
Stock issued, settlement of fully vested stock awards, fair value grant date	$ 118	$ 119	$ 93
Stock Award Activity (Table)
Stock awards - outstanding at period start	701	796	938
Stock awards - granted	262	339	376
Stock awards - vested	(296)	(383)	(455)
Stock awards - forfeited	(64)	(51)	(63)
Stock awards - outstanding at period end	603	701	796	938
Stock Awards, Weighted Average Grant Date Fair Value [Table]
Weighted-average grant date fair value - outstanding at period start	$ 278	$ 244	$ 192
Weighted-average grant date fair value - granted	350	274	321
Weighted-average grant date fair value - vested	305	222	181
Weighted-average grant date fair value - forfeited	303	280	250
Weighted-average grant date fair value - outstanding at period end	$ 311	$ 278	$ 244	$ 192
Amended 2011 Plan [Domain]
Share-based Compensation by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	5,100
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	2,400
2011 Long-Term Incentive Stock Plan [Member]
Share-based Compensation by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	5,200

Stock Compensation Plans Cash Awards (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 97
Minimum \| Grants During 2010 and After [Member]
Share-based Compensation by Share-based Payment Award
Share Based Compensation Arrangement By Share Based Payment Award Award Grants Percentage Financial Metric Met Exceeded	0.00%
Maximum [Member] \| Grants During 2010 and After [Member]
Share-based Compensation by Share-based Payment Award
Share Based Compensation Arrangement By Share Based Payment Award Award Grants Percentage Financial Metric Met Exceeded	200.00%
Cash Units and Cash Performance Units [Member]
Share-based Compensation by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 121
Cash Units and Cash Performance Units [Member] \| Minimum
Share-based Compensation by Share-based Payment Award
Deferred Compensation Cash-based Arrangements, Liability, Current	31	$ 36	$ 36
Cash Units and Cash Performance Units [Member] \| Maximum [Member]
Share-based Compensation by Share-based Payment Award
Deferred Compensation Cash-based Arrangements, Liability, Current	$ 175	$ 203	$ 205

Leases Total Lease Cost (Details 1) - USD ($) $ in Millions	12 Months Ended
Leases Total Lease Cost (Details 1) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease cost	$ 320	$ 318
Variable lease cost	28	11
Short-term lease cost	93	75
Total lease cost	$ 441	$ 404
Operating Leases, Rent Expense Under ASC 840			$ 375

Leases Lease Balance Sheet (Details 2) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	$ 1,533	$ 1,511
Operating Lease, Liability, Current	263	261
Operating Lease, Liability, Noncurrent	1,343	1,308
Total operating lease liabilities	$ 1,606	$ 1,569

Leases Lease Other Supplemental Information (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease Other Supplemental Information (Details 3) [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 275	$ 307
Right-of-use assets obtained in exchange for new lease liabilities	$ 345	$ 462
Operating Lease, Weighted Average Remaining Lease Term	12 years 1 month 6 days	11 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	3.50%	3.80%

Leases Lease Maturities (Details 4) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Lessee, Operating Lease, Lease Not yet Commenced, Value	$ 361
Lessee, Operating Lease, Liability, Payments, Due Next Year	298
Lessee, Operating Lease, Liability, Payments, Due Year Two	267
Lessee, Operating Lease, Liability, Payments, Due Year Three	228
Lessee, Operating Lease, Liability, Payments, Due Year Four	185
Lessee, Operating Lease, Liability, Payments, Due Year Five	142
Lessee, Operating Lease, Liability, Payments, Due after Year Five	902
Lessee, Operating Lease, Liability, Payments, Due	2,022
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	416
Operating Lease, Liability	$ 1,606	$ 1,569
Minimum
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	4 years
Maximum [Member]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	15 years

Segment Information Reconciliation to Consolidated Operating Income (Details 1) $ in Millions	3 Months Ended								7 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Number of reportable segments										4
Sales	$ 10,212	$ 9,083	$ 8,884	$ 8,620	$ 8,721	$ 8,475	$ 8,456	$ 8,189		$ 36,799	$ 33,841	$ 30,095
Operating income	$ 1,152	$ 985	$ 994	$ 934	$ 1,136	$ 951	$ 946	$ 936		4,065	3,969	3,780
Operating Segments
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income										4,188	3,978	3,514
Operating Segments \| Aeronautics Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										12,169	11,116	10,293
Operating income										1,206	1,188	1,128
Operating Segments \| Defense Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										7,543	7,495	6,612
Operating income										846	793	697
Operating Segments \| Mission Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										10,080	9,410	8,949
Operating income										1,459	1,408	1,245
Operating Segments \| Space Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales									$ 3,100	8,744	7,425	5,845
Operating income									$ 342	893	794	644
Intersegment sales
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										1,737	1,605	1,604
Operating income										216	205	200
Intersegment sales \| Aeronautics Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										122	103	73
Operating income										11	10	8
Intersegment sales \| Defense Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										728	691	750
Operating income										76	74	74
Intersegment sales \| Mission Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										779	728	718
Operating income										116	113	115
Intersegment sales \| Space Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										108	83	63
Operating income										13	8	3
Corporate, Non-Segment [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income										(541)	(474)	(347)
Segment Reconciling Items [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Net FAS (service)/ CAS pension adjustment										$ 418	$ 465	$ 613

Segment Information Sales by Customer Type (Details 2) - USD ($) $ in Millions	3 Months Ended								7 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Sales	$ 10,212	$ 9,083	$ 8,884	$ 8,620	$ 8,721	$ 8,475	$ 8,456	$ 8,189		$ 36,799	$ 33,841	$ 30,095
Concentration Risk, Percentage										100.00%	100.00%	100.00%
US Government
Revenue, Major Customer [Line Items]
Sales										$ 30,903	$ 27,934	$ 24,796
Concentration Risk, Percentage										84.00%	83.00%	82.00%
US Government \| Aeronautics Systems
Revenue, Major Customer [Line Items]
Sales										$ 10,411	$ 9,258	$ 8,732
Concentration Risk, Percentage										86.00%	83.00%	85.00%
US Government \| Defense Systems
Revenue, Major Customer [Line Items]
Sales										$ 5,103	$ 4,952	$ 4,132
Concentration Risk, Percentage										68.00%	66.00%	62.00%
US Government \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales										$ 7,279	$ 6,765	$ 6,501
Concentration Risk, Percentage										72.00%	72.00%	73.00%
US Government \| Space Systems
Revenue, Major Customer [Line Items]
Sales										$ 8,110	$ 6,959	$ 5,431
Concentration Risk, Percentage										93.00%	94.00%	93.00%
International
Revenue, Major Customer [Line Items]
Sales										$ 5,188	$ 5,154	$ 4,434
Concentration Risk, Percentage										14.00%	15.00%	15.00%
International \| Aeronautics Systems
Revenue, Major Customer [Line Items]
Sales										$ 1,595	$ 1,688	$ 1,402
Concentration Risk, Percentage										13.00%	15.00%	13.00%
International \| Defense Systems
Revenue, Major Customer [Line Items]
Sales										$ 1,317	$ 1,442	$ 1,249
Concentration Risk, Percentage										17.00%	19.00%	19.00%
International \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales										$ 1,945	$ 1,839	$ 1,653
Concentration Risk, Percentage										19.00%	19.00%	18.00%
International \| Space Systems
Revenue, Major Customer [Line Items]
Sales										$ 331	$ 185	$ 130
Concentration Risk, Percentage										4.00%	2.00%	2.00%
Other Customers
Revenue, Major Customer [Line Items]
Sales										$ 708	$ 753	$ 865
Concentration Risk, Percentage										2.00%	2.00%	3.00%
Other Customers \| Aeronautics Systems
Revenue, Major Customer [Line Items]
Sales										$ 41	$ 67	$ 86
Concentration Risk, Percentage										0.00%	1.00%	1.00%
Other Customers \| Defense Systems
Revenue, Major Customer [Line Items]
Sales										$ 395	$ 410	$ 481
Concentration Risk, Percentage										5.00%	6.00%	7.00%
Other Customers \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales										$ 77	$ 78	$ 77
Concentration Risk, Percentage										1.00%	1.00%	1.00%
Other Customers \| Space Systems
Revenue, Major Customer [Line Items]
Sales										$ 195	$ 198	$ 221
Concentration Risk, Percentage										2.00%	3.00%	4.00%
Intersegment Sales [Member] \| Aeronautics Systems
Revenue, Major Customer [Line Items]
Sales										$ 122	$ 103	$ 73
Concentration Risk, Percentage										1.00%	1.00%	1.00%
Intersegment Sales [Member] \| Defense Systems
Revenue, Major Customer [Line Items]
Sales										$ 728	$ 691	$ 750
Concentration Risk, Percentage										10.00%	9.00%	12.00%
Intersegment Sales [Member] \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales										$ 779	$ 728	$ 718
Concentration Risk, Percentage										8.00%	8.00%	8.00%
Intersegment Sales [Member] \| Space Systems
Revenue, Major Customer [Line Items]
Sales										$ 108	$ 83	$ 63
Concentration Risk, Percentage										1.00%	1.00%	1.00%
Operating Segments [Member] \| Aeronautics Systems
Revenue, Major Customer [Line Items]
Sales										$ 12,169	$ 11,116	$ 10,293
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Operating Segments [Member] \| Defense Systems
Revenue, Major Customer [Line Items]
Sales										$ 7,543	$ 7,495	$ 6,612
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Operating Segments [Member] \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales										$ 10,080	$ 9,410	$ 8,949
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Operating Segments [Member] \| Space Systems
Revenue, Major Customer [Line Items]
Sales									$ 3,100	$ 8,744	$ 7,425	$ 5,845
Concentration Risk, Percentage										100.00%	100.00%	100.00%

Segment Information Sales by Contract Type (Details 3) - USD ($) $ in Millions	3 Months Ended								7 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue, Contract Type [Line Items]
Sales	$ 10,212	$ 9,083	$ 8,884	$ 8,620	$ 8,721	$ 8,475	$ 8,456	$ 8,189		$ 36,799	$ 33,841	$ 30,095
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Operating Segments [Member] \| Aeronautics Systems
Revenue, Contract Type [Line Items]
Sales										$ 12,169	$ 11,116	$ 10,293
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Operating Segments [Member] \| Defense Systems
Revenue, Contract Type [Line Items]
Sales										$ 7,543	$ 7,495	$ 6,612
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Operating Segments [Member] \| Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales										$ 10,080	$ 9,410	$ 8,949
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Operating Segments [Member] \| Space Systems
Revenue, Contract Type [Line Items]
Sales									$ 3,100	$ 8,744	$ 7,425	$ 5,845
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Cost-type
Revenue, Contract Type [Line Items]
Sales										$ 18,438	$ 16,479	$ 15,004
Concentration Risk, Percentage										50.00%	49.00%	50.00%
Cost-type \| Aeronautics Systems
Revenue, Contract Type [Line Items]
Sales										$ 6,142	$ 5,299	$ 5,066
Concentration Risk, Percentage										51.00%	48.00%	50.00%
Cost-type \| Defense Systems
Revenue, Contract Type [Line Items]
Sales										$ 2,345	$ 2,509	$ 2,386
Concentration Risk, Percentage										34.00%	37.00%	41.00%
Cost-type \| Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales										$ 3,582	$ 3,335	$ 3,099
Concentration Risk, Percentage										39.00%	38.00%	38.00%
Cost-type \| Space Systems
Revenue, Contract Type [Line Items]
Sales										$ 6,369	$ 5,336	$ 4,453
Concentration Risk, Percentage										74.00%	73.00%	77.00%
Fixed-price
Revenue, Contract Type [Line Items]
Sales										$ 18,361	$ 17,362	$ 15,091
Concentration Risk, Percentage										50.00%	51.00%	50.00%
Fixed-price \| Aeronautics Systems
Revenue, Contract Type [Line Items]
Sales										$ 5,905	$ 5,714	$ 5,154
Concentration Risk, Percentage										49.00%	52.00%	50.00%
Fixed-price \| Defense Systems
Revenue, Contract Type [Line Items]
Sales										$ 4,470	$ 4,295	$ 3,476
Concentration Risk, Percentage										66.00%	63.00%	59.00%
Fixed-price \| Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales										$ 5,719	$ 5,347	$ 5,132
Concentration Risk, Percentage										61.00%	62.00%	62.00%
Fixed-price \| Space Systems
Revenue, Contract Type [Line Items]
Sales										$ 2,267	$ 2,006	$ 1,329
Concentration Risk, Percentage										26.00%	27.00%	23.00%
Intersegment Sales [Member] \| Aeronautics Systems
Revenue, Contract Type [Line Items]
Sales										$ 122	$ 103	$ 73
Intersegment Sales [Member] \| Defense Systems
Revenue, Contract Type [Line Items]
Sales										728	691	750
Intersegment Sales [Member] \| Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales										779	728	718
Intersegment Sales [Member] \| Space Systems
Revenue, Contract Type [Line Items]
Sales										$ 108	$ 83	$ 63

Segment Information Sales by Geographic Location (Details 4) - USD ($) $ in Millions	3 Months Ended								7 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 10,212	$ 9,083	$ 8,884	$ 8,620	$ 8,721	$ 8,475	$ 8,456	$ 8,189		$ 36,799	$ 33,841	$ 30,095
Concentration Risk, Percentage										100.00%	100.00%	100.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 31,611	$ 28,687	$ 25,661
Concentration Risk, Percentage										86.00%	85.00%	85.00%
Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 1,968	$ 1,836	$ 1,666
Concentration Risk, Percentage										5.00%	6.00%	6.00%
All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 1,138	$ 1,485	$ 1,254
Concentration Risk, Percentage										3.00%	4.00%	4.00%
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 2,082	$ 1,833	$ 1,514
Concentration Risk, Percentage										6.00%	5.00%	5.00%
Aeronautics Systems \| United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 10,452	$ 9,325	$ 8,818
Concentration Risk, Percentage										87.00%	85.00%	86.00%
Aeronautics Systems \| Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 841	$ 810	$ 677
Concentration Risk, Percentage										7.00%	7.00%	7.00%
Aeronautics Systems \| All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 180	$ 291	$ 189
Concentration Risk, Percentage										1.00%	3.00%	2.00%
Aeronautics Systems \| Intersegment Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 122	$ 103	$ 73
Aeronautics Systems \| Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 574	$ 587	$ 536
Concentration Risk, Percentage										5.00%	5.00%	5.00%
Aeronautics Systems \| Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 12,169	$ 11,116	$ 10,293
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Defense Systems \| United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 5,498	$ 5,362	$ 4,613
Concentration Risk, Percentage										81.00%	79.00%	79.00%
Defense Systems \| Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 402	$ 369	$ 365
Concentration Risk, Percentage										6.00%	5.00%	6.00%
Defense Systems \| All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 600	$ 824	$ 680
Concentration Risk, Percentage										9.00%	12.00%	12.00%
Defense Systems \| Intersegment Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 728	$ 691	$ 750
Defense Systems \| Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 315	$ 249	$ 204
Concentration Risk, Percentage										4.00%	4.00%	3.00%
Defense Systems \| Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 7,543	$ 7,495	$ 6,612
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Mission Systems [Member] \| United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 7,356	$ 6,843	$ 6,578
Concentration Risk, Percentage										79.00%	79.00%	80.00%
Mission Systems [Member] \| Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 707	$ 637	$ 592
Concentration Risk, Percentage										8.00%	7.00%	7.00%
Mission Systems [Member] \| All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 345	$ 352	$ 379
Concentration Risk, Percentage										4.00%	4.00%	5.00%
Mission Systems [Member] \| Intersegment Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 779	$ 728	$ 718
Mission Systems [Member] \| Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 893	$ 850	$ 682
Concentration Risk, Percentage										9.00%	10.00%	8.00%
Mission Systems [Member] \| Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 10,080	$ 9,410	$ 8,949
Concentration Risk, Percentage										100.00%	100.00%	100.00%
Space Systems \| United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 8,305	$ 7,157	$ 5,652
Concentration Risk, Percentage										96.00%	98.00%	98.00%
Space Systems \| Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 18	$ 20	$ 32
Concentration Risk, Percentage										0.00%	0.00%	0.00%
Space Systems \| All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 13	$ 18	$ 6
Concentration Risk, Percentage										0.00%	0.00%	0.00%
Space Systems \| Intersegment Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 108	$ 83	$ 63
Space Systems \| Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales										$ 300	$ 147	$ 92
Concentration Risk, Percentage										4.00%	2.00%	2.00%
Space Systems \| Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									$ 3,100	$ 8,744	$ 7,425	$ 5,845
Concentration Risk, Percentage										100.00%	100.00%	100.00%

Segment Information Intersegment Sales and Operating Income (Details 5) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Sales	$ 10,212	$ 9,083	$ 8,884	$ 8,620	$ 8,721	$ 8,475	$ 8,456	$ 8,189	$ 36,799	$ 33,841	$ 30,095
Intersegment sales and operating income (Table Amounts) [Abstract]
Operating income	$ 1,152	$ 985	$ 994	$ 934	$ 1,136	$ 951	$ 946	$ 936	4,065	3,969	3,780
Intersegment sales
Segment Reporting Information [Line Items]
Sales									1,737	1,605	1,604
Intersegment sales and operating income (Table Amounts) [Abstract]
Operating income									216	205	200
Intersegment sales \| Aeronautics Systems
Segment Reporting Information [Line Items]
Sales									122	103	73
Intersegment sales and operating income (Table Amounts) [Abstract]
Operating income									11	10	8
Intersegment sales \| Defense Systems
Segment Reporting Information [Line Items]
Sales									728	691	750
Intersegment sales and operating income (Table Amounts) [Abstract]
Operating income									76	74	74
Intersegment sales \| Mission Systems
Segment Reporting Information [Line Items]
Sales									779	728	718
Intersegment sales and operating income (Table Amounts) [Abstract]
Operating income									116	113	115
Intersegment sales \| Space Systems
Segment Reporting Information [Line Items]
Sales									108	83	63
Intersegment sales and operating income (Table Amounts) [Abstract]
Operating income									$ 13	$ 8	$ 3

- Definition

+ References

+ Details

Segment Information Assets (Details 6) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 44,469	$ 41,089
Operating Segments [Member] \| Aeronautics Systems
Segment Reporting Information [Line Items]
Total assets	8,997	9,104
Operating Segments [Member] \| Defense Systems
Segment Reporting Information [Line Items]
Total assets	7,352	7,420
Operating Segments [Member] \| Mission Systems
Segment Reporting Information [Line Items]
Total assets	10,029	9,934
Operating Segments [Member] \| Space Systems
Segment Reporting Information [Line Items]
Total assets	10,028	10,595
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	$ 8,063	$ 4,036

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
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+ Details

Segment Information Capital Expenditures and Depreciation and Amortization (Details 7) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	$ 1,420	$ 1,264	$ 1,249
Depreciation and amortization	1,267	1,265	800
Other Depreciation and Amortization	1,005	1,018	800
Aeronautics Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	540	528	657
Depreciation and amortization	238	224	190
Defense Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	78	71	66
Depreciation and amortization	48	44	65
Mission Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	302	229	197
Depreciation and amortization	150	133	121
Space Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	440	352	226
Depreciation and amortization	211	189	130
Corporate
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	60	84	103
Depreciation and amortization	$ 358	$ 428	$ 294

Unaudited Selected Quarterly Data (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unaudited Selected Quarterly Data (Table Amounts) [Abstract]
Sales	$ 10,212	$ 9,083	$ 8,884	$ 8,620	$ 8,721	$ 8,475	$ 8,456	$ 8,189	$ 36,799	$ 33,841	$ 30,095
Operating income	1,152	985	994	934	1,136	951	946	936	4,065	3,969	3,780
Net earnings	$ 330	$ 986	$ 1,005	$ 868	$ (409)	$ 933	$ 861	$ 863	$ 3,189	$ 2,248	$ 3,229
Basic earnings per share	$ 1.98	$ 5.91	$ 6.02	$ 5.18	$ (2.43)	$ 5.52	$ 5.07	$ 5.08	$ 19.08	$ 13.28	$ 18.59
Diluted earnings per share	$ 1.97	$ 5.89	$ 6.01	$ 5.15	$ (2.43)	$ 5.49	$ 5.06	$ 5.06	$ 19.03	$ 13.22	$ 18.49
Weighted-average common shares outstanding	166.8	166.8	166.9	167.7	168.4	169.1	169.7	170.0	167.1	169.3	173.7
Weighted-average diluted shares outstanding	167.4	167.3	167.3	168.4	168.4	169.9	170.3	170.7	167.6	170.0	174.6

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.