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Document and Entity Information Document - shares	3 Months Ended
Document and Entity Information Document - shares	Mar. 31, 2019	Apr. 19, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	NORTHROP GRUMMAN CORP /DE/
Entity Central Index Key	0001133421
Document Type	10-Q
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Period End Date	Mar. 31, 2019
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		169,799,679

Condensed Consolidated Statements of Earnings and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sales	$ 8,189	$ 6,735
Operating costs and expenses
General and administrative expenses	760	711
Operating income	936	848
Other (expense) income
Interest expense	(138)	(143)
Net FAS (non-service) pension benefit	200	254
Other, net	36	40
Earnings before income taxes	1,034	999
Federal and foreign income tax expense	171	159
Net earnings	$ 863	$ 840
Basic earnings per share
Basic earnings per share	$ 5.08	$ 4.82
Weighted-average common shares outstanding, in millions	170.0	174.3
Diluted earnings per share
Diluted earnings per share	$ 5.06	$ 4.79
Weighted-average diluted shares outstanding, in millions	170.7	175.4
Net earnings (from above)	$ 863	$ 840
Change in unamortized prior service credit, net of tax	(11)	(15)
Change in cumulative translation adjustment and other, net	4	(3)
Other comprehensive loss, net of tax	(7)	(18)
Comprehensive income	856	822
Product [Member]
Sales	5,728	4,289
Cost of Sales	4,517	3,269
Service [Member]
Sales	2,461	2,446
Cost of Sales	$ 1,976	$ 1,907

Condensed Consolidated Statements of Financial Position (Unaudited) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 755	$ 1,579
Accounts receivable, net	2,166	1,448
Unbilled receivables, net	5,785	5,026
Inventoried costs, net	778	654
Prepaid expenses and other current assets	959	973
Total current assets	10,443	9,680
Property, plant and equipment, net of accumulated depreciation of $5,493 for 2019 and $5,369 for 2018	6,420	6,372
Operating lease right-of-use assets	1,283	0
Goodwill	18,698	18,672
Intangible assets, net	1,289	1,372
Deferred tax assets	84	94
Other non-current assets	1,534	1,463
Total assets	39,751	37,653
Liabilities
Trade accounts payable	1,932	2,182
Accrued employee compensation	1,404	1,676
Advance payments and billings in excess of costs incurred	1,969	1,917
Other current liabilities	3,516	2,499
Total current liabilities	8,821	8,274
Long-term debt, net of current portion of $523 for 2019 and $517 for 2018	13,863	13,883
Pension and other postretirement benefit plan liabilities	5,646	5,755
Operating lease liabilities	1,098	0
Deferred tax liabilities	133	108
Other non-current liabilities	1,451	1,446
Total liabilities	31,012	29,466
Commitments and contingencies
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: 2019—169,873,750 and 2018—170,607,336	170	171
Paid-in capital	0	0
Retained earnings	8,628	8,068
Accumulated other comprehensive loss	(59)	(52)
Total shareholders’ equity	8,739	8,187
Total liabilities and shareholders’ equity	$ 39,751	$ 37,653

Condensed Consolidated Statements of Financial Position (Unaudited) (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accumulated depreciation	$ (5,493)	$ (5,369)
Long-term Debt, Current Maturities	$ 523	$ 517
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	169,873,750	170,607,336
Common Stock, shares outstanding	169,873,750	170,607,336

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities
Net earnings	$ 863	$ 840
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	234	122
Non-cash lease expense	68	0
Stock-based compensation	26	19
Deferred income taxes	33	(22)
Changes in assets and liabilities:
Accounts receivable, net	(718)	(187)
Unbilled receivables, net	(759)	(404)
Inventoried costs, net	(124)	(37)
Prepaid expenses and other assets	(23)	13
Accounts payable and other liabilities	(480)	(590)
Income taxes payable, net	140	197
Retiree benefits	(142)	(190)
Other, net	(31)	2
Net cash used in operating activities	(913)	(237)
Investing activities
Capital expenditures	(284)	(305)
Other, net	4	(2)
Net cash used in investing activities	(280)	(307)
Financing activities
Payments to credit facilities	(20)	(14)
Net borrowings on commercial paper	814	0
Common stock repurchases	(60)	0
Cash dividends paid	(211)	(198)
Payments of employee taxes withheld from share-based awards	(61)	(79)
Other, net	0	(21)
Net cash provided by (used in) financing activities	462	(312)
Decrease in cash, cash equivalents and restricted cash	(731)	(856)
Cash, cash equivalents and restricted cash, beginning of year	1,579	11,225
Cash, cash equivalents and restricted cash, end of period	$ 848	$ 10,369

Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common stock	Paid-in capital	Retained earnings	Accumulated other comprehensive (loss) income
Beginning of year at Dec. 31, 2017		$ 174	$ 44	$ 6,913	$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact from adoption of ASU 2018-02 and ASU 2016-01				(21)	21
Common stock repurchased		0		0
Net earnings	$ 840			840
Dividends declared				(195)
Stock compensation			(44)	(35)
Other comprehensive loss, net of tax	(18)				(18)
End of period at Mar. 31, 2018	$ 7,680	174	0	7,502	4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.10
Beginning of year at Dec. 31, 2018	$ 8,187	171	0	8,068	(52)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact from adoption of ASU 2018-02 and ASU 2016-01				0	0
Common stock repurchased		(1)		(62)
Net earnings	863			863
Dividends declared				(206)
Stock compensation			0	(35)
Other comprehensive loss, net of tax	(7)				(7)
End of period at Mar. 31, 2019	$ 8,739	$ 170	$ 0	$ 8,628	$ (59)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.20

- Definition

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

+ References + Details

Basis of Presentation (Unaudited)

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BASIS OF PRESENTATION

Principles of Consolidation and Reporting

These unaudited condensed consolidated financial statements (the “financial statements”) include the accounts of Northrop Grumman Corporation and its subsidiaries and joint ventures or other investments for which we consolidate the financial results (herein referred to as “Northrop Grumman,” the “company,” “we,” “us,” or “our”). Material 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.

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 Innovation Systems subsequent to the Merger date have been included in the company's unaudited condensed consolidated results of operations. See Note 2 for further information regarding the Merger.

These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP” or “FAS”) and in accordance with the rules of the Securities and Exchange Commission (SEC) for interim reporting. The financial statements include adjustments of a normal recurring nature considered necessary by management for a fair presentation of the company’s unaudited condensed consolidated financial position, results of operations and cash flows.

The results reported in these financial statements are not necessarily indicative of results that may be expected for the entire year. These financial statements should be read in conjunction with the information contained in the company’s 2018 Annual Report on Form 10-K.

The quarterly information is labeled using a calendar convention; that is, first quarter is consistently labeled as ending on March 31, second quarter as ending on June 30 and third quarter as ending on September 30. It is legacy Northrop Grumman’s long-standing practice to establish actual interim closing dates using a “fiscal” calendar, in which we close our books on a Friday near these quarter-end dates in order to normalize the potentially disruptive effects of quarterly closings on business processes. Similarly, Innovation Systems uses a “fiscal” calendar by closing its books on a Sunday near these quarter-end dates and will continue this practice until its business processes are aligned with legacy Northrop Grumman’s. This practice is only used at interim periods within a reporting year.

As previously announced, effective January 1, 2019, we adopted Accounting Standards Codification (ASC) Topic 842, Leases, using the optional transition method to apply the standard through a cumulative effect adjustment in the period of adoption. The adoption of this standard is reflected in the amounts and disclosures set forth in this Form 10-Q.

Accounting Estimates

Preparation of the financial statements 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 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 contract.

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 lifecycle (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 a cost plus a reasonable margin approach. 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. Our accounting for 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. As control is effectively transferred while we perform on our contracts, we generally recognize revenue over time using the cost-to-cost method (cost incurred relative to total cost estimated at completion) as 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 revenue 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. Each loss provision is first offset against costs included in Unbilled receivables or Inventoried costs; remaining amounts are reflected in Other current liabilities.

Significant EAC adjustments on a single contract could 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 discrete event or adjustments to an individual contract were material to the financial statements during the three months ended March 31, 2019 and 2018.

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



	Three Months Ended March 31
$ in millions, except per share data	2019		2018
Operating income	$	138	$	116
Net earnings⁽¹⁾	109		92
Diluted earnings per share⁽¹⁾	0.64		0.52


⁽¹⁾	Based on a 21 percent statutory tax rate.

Revenue recognized from performance obligations satisfied in previous reporting periods was $166 million and $133 million for the three months ended March 31, 2019 and 2018, respectively.

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 the option or IDIQ task order is exercised or awarded.

Company backlog as of March 31, 2019 was $57.3 billion. We expect to recognize approximately 50 percent and 75 percent of our March 31, 2019 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 unaudited condensed 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 unaudited condensed 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.

The amount of revenue recognized for the three months ended March 31, 2019 and 2018 that was included in the contract liability balances at the beginning of each year was $674 million and $706 million, respectively.

Disaggregation of Revenue

See Note 11 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.

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows:



$ in millions	March 31, 2019			December 31, 2018
Unamortized prior service credit, net of tax expense of $28 for 2019 and $32 for 2018	$	87		$	98
Cumulative translation adjustment	(143		)	(144		)
Other, net	(3		)	(6		)
Total accumulated other comprehensive loss	$	(59	)	$	(52	)

Reclassifications from accumulated other comprehensive loss to net earnings related to the amortization of prior service credit were $11 million and $15 million, net of taxes, for the three months ended March 31, 2019 and 2018, respectively. The reclassifications are included in the computation of net periodic pension cost (benefit). See Note 8 for further information.

Reclassifications from accumulated other comprehensive loss to net earnings relating to cumulative translation adjustments and effective cash flow hedges were not material for the three months ended March 31, 2019 and 2018.

Leases

The company leases certain buildings, land and equipment. Under ASC 842, at contract inception we determine whether the contract is or contains a lease and whether the lease should be classified as an operating or a financing lease. Operating leases are included in Operating lease right-of-use (ROU) assets, Other current liabilities, and Operating lease liabilities in our unaudited condensed consolidated statements of financial position.

The company recognizes operating lease ROU 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. In our adoption of ASC 842, we elected not to 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, if the incentive is determined to be a leasehold improvement owned by the lessee, the company generally records a deferred rent liability and amortizes the deferred rent over the term of the lease as a reduction to rent expense. 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 unaudited condensed 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.

Restricted Cash

On occasion, we are required to maintain cash deposits with banks in connection with certain contingent obligations. This restricted cash is included in Prepaid expenses and other current assets in the unaudited condensed consolidated statements of financial position. As of March 31, 2019 our restricted cash totaled approximately $93 million. We had no restricted cash as of December 31, 2018.

Related Party Transactions

The company had no material related party transactions in any period presented.

Accounting Standards Updates

On February 25, 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASC Topic 842 supersedes existing lease guidance, including ASC 840 - Leases. Among other things, ASU 2016-02 requires recognition of a right-of-use asset and liability for future lease payments for contracts that meet the definition of a lease and requires disclosure of certain information about leasing arrangements. On July 30, 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which, among other things, allows companies to elect an optional transition method to apply the new lease standard through a cumulative-effect adjustment in the period of adoption.

We adopted the standard on January 1, 2019 using the optional transition method and, as a result, did not recast prior period unaudited condensed comparative financial statements. All prior period amounts and disclosures are presented under ASC 840. We elected the package of practical expedients, which, among other things, allows us to carry forward our prior lease classifications under ASC 840. We did not elect to adopt the hindsight practical expedient and are therefore maintaining the lease terms we previously determined under ASC 840. Adoption of the new standard resulted in the recording of additional lease assets and lease liabilities on the unaudited condensed consolidated statements of financial position with no cumulative impact to retained earnings and did not have a material impact on our results of operations or cash flows.

Other accounting standards updates adopted and/or issued, but not effective until after March 31, 2019, are not expected to have a material effect on the company’s unaudited condensed consolidated financial position, annual results of operations and/or cash flows.

Business Acquisition (Unaudited) Business Acquisition (Unaudited)

3 Months Ended

Mar. 31, 2019

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

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 will enable 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.

Preliminary 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.

During the second quarter of 2018, the company completed a preliminary analysis to determine the fair values of the assets acquired and liabilities assumed and the amounts recorded reflected management’s initial assessment of fair value as of the Merger date. Based on additional information obtained to date, the company refined its initial assessment of fair value and recognized the following significant adjustments to our preliminary purchase price allocation: Intangible assets increased $220 million, Other current liabilities increased $114 million, Pension and other postretirement benefit (OPB) plan liabilities increased $56 million, Other non-current liabilities increased $53 million and Goodwill decreased $47 million. These adjustments did not result in a material impact on the financial results of prior periods.

The company expects to finalize its purchase price allocation within one year of the Merger date. We are continuing to analyze and assess relevant information in the following areas to determine the fair value of assets acquired and liabilities assumed as of the Merger date: certain income tax, legal and contract-related matters. The final fair value determination could result in material adjustments to the values presented in the preliminary purchase price allocation table below.

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 preliminary purchase price allocation table presents the company’s refined estimate 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	1,264
Inventoried costs	220
Other current assets	226
Property, plant and equipment	1,509
Goodwill	6,248
Intangible assets	1,525
Other non-current assets	151
Total assets acquired	11,824
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	(253		)
Other non-current liabilities	(189		)
Total liabilities assumed	(4,082		)
Total purchase price	$	7,742


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

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

The preliminary purchase price allocation resulted in the recognition of $6.2 billion of goodwill, a majority of which was allocated to the Innovation Systems sector. The goodwill recognized is attributable to expected revenue synergies generated by the integration of Aerospace Systems, Mission Systems and Technology Services 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 and computed as if Orbital ATK had been included in our results as of January 1, 2017:



$ in millions, except per share amounts	Three Months Ended March 31, 2018
Sales	$	8,000
Net earnings	914
Diluted earnings per share	5.21

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 $47 million for the three months ended March 31, 2018.


2.	The elimination of nonrecurring transaction costs incurred by the company and Orbital ATK in connection with the Merger of $7 million for the three months ended March 31, 2018.


3.	The recognition of additional depreciation expense, net of removal of historical depreciation expense, of $6 million for the three months ended March 31, 2018 related to the step-up in fair value of acquired property, plant and equipment.


4.	The recognition of additional amortization expense, net of removal of historical amortization expense, of $66 million for the three months ended March 31, 2018 related to the fair value of acquired intangible assets.


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 $31 million for the three months ended March 31, 2018.


6.	The income tax effect on the pro forma adjustments, which was calculated using the federal statutory tax rate, of $7 million for the three months ended March 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.

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

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

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 0.7 million shares and 1.1 million shares for the three months ended March 31, 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.

On December 4, 2018, 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 “2018 Repurchase Program”). By its terms, repurchases under the 2018 Repurchase Program will commence upon completion of the 2015 Repurchase Program and will expire when we have used all authorized funds for repurchases.

During the fourth quarter of 2018, the company entered into an accelerated share repurchase (ASR) agreement with Goldman Sachs & Co. LLC (Goldman Sachs) to repurchase $1.0 billion of the company’s common stock under the 2015 Repurchase Program. Under the agreement, we made a payment of $1.0 billion to Goldman Sachs and received an initial delivery of 3.0 million shares valued at $800 million that were immediately canceled by the company. The remaining balance was settled on January 4, 2019 with a final delivery of 0.9 million shares from Goldman Sachs. The final average purchase price was $260.32 per share.

As of March 31, 2019, repurchases under the 2015 Repurchase Program totaled $3.0 billion; $1.0 billion remained under this share repurchase authorization. By its terms, the 2015 Repurchase Program is set to 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 and 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:



							Shares Repurchased (in millions)
Repurchase Program Authorization Date	Amount Authorized (in millions)		Total Shares Retired (in millions)	Average Price Per Share⁽¹⁾		Date Completed	Three Months Ended March 31
Repurchase Program Authorization Date	Amount Authorized (in millions)		Total Shares Retired (in millions)	Average Price Per Share⁽¹⁾		Date Completed	2019	2018
September 16, 2015	$	4,000	12.4	$	241.36		1.1	—
December 4, 2018	$	3,000	—	$	—		—	—


⁽¹⁾	Includes commissions paid.

Dividends on Common Stock

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.

Income Taxes (Unaudited)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

INCOME TAXES



	Three Months Ended March 31
$ in millions	2019			2018
Federal and foreign income tax expense	$	171		$	159
Effective income tax rate	16.5		%	15.9		%

The effective tax rate for the first quarter of 2019 increased to 16.5 percent from 15.9 percent in the first quarter of 2018 primarily due to lower tax benefits related to employee share-based compensation and claims for prior year manufacturing deductions, partially offset by higher research credits. The company’s effective rate for the first quarter of 2019 includes $31 million of research credits and $13 million of excess tax benefits for employee share-based compensation. The company’s effective tax rate for the first quarter of 2018 included $26 million of excess tax benefits for employee share-based compensation, $20 million of research credits and $8 million of claims for prior year manufacturing deductions.

During the three months ended March 31, 2019, we increased our unrecognized tax benefits related to our methods of accounting associated with the Tax Cuts and Jobs Act by approximately $15 million and it is reasonably possible that within the next twelve months those unrecognized tax benefits may increase by up to an additional $70 million.

We file income tax returns in the U.S. federal jurisdiction and in various state and foreign jurisdictions. The Northrop Grumman 2014-2017 federal tax returns and refund claims related to its 2007-2016 federal tax returns are currently under 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 year 2016 are currently under IRS examination.

Fair Value of Financial Instruments (Unaudited)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

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; and therefore are not required to be categorized in the fair value hierarchy table below. Marketable securities are included in Other non-current assets in the unaudited condensed consolidated statements of financial position.

The company’s derivative portfolio consists primarily of commodity forward contracts and foreign currency forward contracts. The company periodically uses commodity forward contracts to hedge forecasted purchases of certain commodities. The contracts generally establish a fixed price for the underlying commodity and are designated and qualify as effective cash flow hedges of such commodity purchases. Commodity derivatives are valued based on prices of future exchanges and recently reported transactions in the marketplace. 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 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:



	March 31, 2019								December 31, 2018
$ in millions	Level 1		Level 2			Total			Level 1		Level 2			Total
Financial Assets (Liabilities)
Marketable securities	$	347	$	—		$	347		$	319	$	1		$	320
Marketable securities valued using NAV	—		—			16			—		—			15
Total marketable securities	347		—			363			319		1			335
Derivatives	—		(5		)	(5		)	—		(10		)	(10		)

At March 31, 2019, the company had commodity forward contracts outstanding that hedge forecasted commodity purchases of 19 million pounds of copper and 7 million pounds of zinc. Gains or losses on the commodity forward contracts are recognized in product and service cost as the performance obligations on related contracts are satisfied.

The notional value of the company’s foreign currency forward contracts at March 31, 2019 and December 31, 2018 was $111 million and $114 million, respectively. The portion of notional value designated as a cash flow hedge at March 31, 2019 was $12 million. At December 31, 2018, no portion of the notional value was designated as a cash flow hedge.

The derivative fair values and related unrealized gains/losses at March 31, 2019 and December 31, 2018 were not material. There were no transfers of financial instruments between the three levels of the fair value hierarchy during the three months ended March 31, 2019.

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

Long-term Debt

The estimated fair value of long-term debt was $14.8 billion and $14.3 billion as of March 31, 2019 and December 31, 2018, 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. The carrying value of long-term debt was $14.4 billion as of March 31, 2019 and December 31, 2018. The current portion of long-term debt is recorded in Other current liabilities in the unaudited condensed consolidated statements of financial position.

- 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

Investigations, Claims and Litigation (Unaudited)	3 Months Ended
Investigations, Claims and Litigation (Unaudited)	Mar. 31, 2019
Disclosure Text Block Supplement [Abstract]
INVESTIGATIONS, CLAIMS AND LITIGATION	INVESTIGATIONS, CLAIMS AND LITIGATION 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 have been delivered. The company’s lawsuit is based on various theories of liability. The complaint 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. 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 April 2, 2013, the U.S. Department of Justice informed the company of a False Claims Act complaint relating to the FSS contract that was filed under seal by a relator in June 2011 in the U.S. District Court for the Eastern District of Virginia. On June 3, 2013, the United States filed a Notice informing the Court that the United States had decided not to intervene in this case. The relator alleged that the company violated the False Claims Act in a number of ways with respect to the FSS contract, alleged damage to the USPS in an amount of at least approximately $179 million annually, alleged that he was improperly discharged in retaliation, and sought an unspecified partial refund of the contract purchase price, penalties, attorney’s fees and other costs of suit. The relator later voluntarily dismissed his retaliation claim and reasserted it in a separate arbitration, which he also ultimately voluntarily dismissed. On September 5, 2014, the court granted the company’s motion for summary judgment and ordered the relator’s False Claims Act case be dismissed with prejudice. On December 19, 2014, the company filed a motion for partial summary judgment asking the court to dismiss the principal counterclaim referenced above. On June 29, 2015, the Court heard argument and denied that motion without prejudice to filing a later motion to dismiss. On February 16, 2018, both the company and the United States filed motions to dismiss many of the claims and counterclaims in whole or in part. The United States also filed a motion seeking to amend its answer and counterclaim, including to reduce its counterclaim to approximately $193 million, which the court granted on June 11, 2018. On October 17, 2018, the court granted in part and denied in part the parties’ motions to dismiss. On December 17, 2018, the court issued a Scheduling Order, proposed by the parties, providing for the parties to engage in mediation through March 1, 2019. After the government shutdown, the mediation was rescheduled for May 2019. The Scheduling Order provides for pretrial activities to resume, if and as necessary, with trial to commence on or about September 23, 2019. Although the ultimate outcome of these matters (“the FSS matters,” collectively), including any possible loss, cannot be predicted or reasonably estimated at this time, the company intends vigorously to pursue and defend the FSS matters. On August 8, 2013, the company received a court-appointed expert’s report in litigation pending in the Second Federal Court of the Federal District in Brazil brought by the Brazilian Post and Telegraph Corporation (ECT), a Brazilian state-owned entity, against Solystic SAS (Solystic), a French subsidiary of the company, and two of its consortium partners. In this suit, commenced on December 17, 2004, and relatively inactive for some period of time, ECT alleges the consortium breached its contract with ECT and seeks damages of approximately R$111 million (the equivalent of approximately $28 million as of March 31, 2019), plus interest, inflation adjustments and attorneys’ fees, as authorized by Brazilian law, which amounts could be significant over time. The original suit sought R$89 million (the equivalent of approximately $23 million as of March 31, 2019) in damages. In October 2013, ECT asserted an additional damage claim of R$22 million (the equivalent of approximately $6 million as of March 31, 2019). In its counterclaim, Solystic alleges ECT breached the contract by wrongfully refusing to accept the equipment Solystic had designed and built and seeks damages of approximately €31 million (the equivalent of approximately $35 million as of March 31, 2019), plus interest, inflation adjustments and attorneys’ fees, as authorized by Brazilian law. The Brazilian court retained an expert to consider certain issues pending before it. On August 8, 2013 and September 10, 2014, the company received reports from the expert, which contain some recommended findings relating to liability and the damages calculations put forth by ECT. Some of the expert’s recommended findings were favorable to the company and others were favorable to ECT. In November 2014, the parties submitted comments on the expert’s most recent report. On June 16, 2015, the court published a decision denying the parties’ request to present oral testimony. In a decision dated November 13, 2018, the trial court ruled in ECT’s favor on one of its claims against Solystic, and awarded damages of R$41 million (the equivalent of approximately $10 million as of March 31, 2019) against Solystic and its consortium partners, with that amount to be adjusted for inflation and interest from November 2004 through any appeal, in accordance with the Manual of Calculations of the Federal Justice, as well as attorneys’ fees. On March 22, 2019, ECT appealed the trial court’s decision to the intermediate court of appeals. Solystic filed its appeal on April 11, 2019. The parties are exploring possible resolution under a newly-established short term ECT dispute resolution program. 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, the New York State Department of Health and other federal, state and local governmental authorities, to address legacy environmental conditions in Bethpage. We have incurred, and expect to continue to incur, as included in Note 7, substantial remediation costs related to these environmental conditions. The remediation standards or requirements to which we are subject are being reconsidered and may change and costs may increase materially. The State of New York has notified us that it intends to seek to impose additional remedial requirements and, among other things, is also evaluating natural resource damages. In addition, we are a party to various, and expect to become a party to additional, legal proceedings and disputes related to remediation and/or alleged environmental impacts in Bethpage, including with federal and state entities, local municipalities and water districts, insurance carriers and 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 (including natural resource 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. On August 12, 2016, a putative class action complaint, naming Orbital ATK and two of its then-officers as defendants, Steven Knurr, et al. v. Orbital ATK, Inc., No. 16-cv-01031 (TSE-MSN), was filed in the United States District Court for the Eastern District of Virginia. The complaint asserts claims on behalf of purchasers of Orbital ATK securities for violations of Sections 10(b) and 20(a) of the Exchange Act and Rule 10b-5, allegedly arising out of false and misleading statements and the failure to disclose that: (i) Orbital ATK lacked effective control over financial reporting; and (ii) as a result, it failed to record an anticipated loss on a long-term contract with the U.S. Army to manufacture and supply small caliber ammunition at the U.S. Army's Lake City Army Ammunition Plant. On April 24, 2017 and October 10, 2017, the plaintiffs filed amended complaints naming additional defendants and asserting claims for alleged violations of additional sections of the Exchange Act and alleged false and misleading statements in Orbital ATK’s Form S-4 filed in connection with the Orbital-ATK Merger. The complaint seeks damages, reasonable costs and expenses at trial, including counsel and expert fees, and such other relief as deemed appropriate by the Court. On August 8, 2018, plaintiffs sought leave to file an additional amended complaint; defendants filed an opposition. The parties engaged in mediation on November 6, 2018. On December 27, 2018, the parties reached a preliminary agreement to resolve the litigation for $108 million subject to agreement on additional terms and to court approval. On February 22, 2019, the court preliminarily approved the parties’ proposed settlement and set a schedule for final settlement proceedings, including a final approval settlement hearing on June 7, 2019. The company is also negotiating with and pursuing coverage litigation against various of its insurance carriers. The company intends vigorously to defend itself in connection with these matters. We currently expect related contingencies will continue to be included in the company’s measurement period adjustments of the fair value of assets acquired and liabilities assumed in the Merger (see Note 2). The SEC is investigating Orbital ATK’s historical accounting practices relating to the restatement of Orbital’s unaudited condensed consolidated financial statements for the quarterly periods ended July 5, 2015 and October 4, 2015 described in the Transition Report on Form 10-K for the nine-month period ending December 31, 2015 previously filed on March 15, 2016. The SEC is also investigating matters relating to a voluntary disclosure Orbital ATK made concerning the restatement described in Orbital ATK’s Form 10-K/A for the nine-month period ending December 31, 2015 filed on February 24, 2017. The ultimate outcome of these matters, including any possible loss, cannot be predicted or reasonably estimated at this time and the company intends to continue to cooperate with the SEC. 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 unaudited condensed consolidated financial position as of March 31, 2019, or its annual results of operations and/or cash flows.

Commitments and Contingencies (Unaudited)

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

U.S. Government Cost Claims

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 unaudited condensed consolidated financial position as of March 31, 2019, or its annual results of operations and/or cash flows.

Environmental Matters

The table below summarizes management’s estimate of the range of reasonably possible future costs for environmental remediation, the amount accrued within that range, and the deferred costs expected to be recoverable through overhead charges on U.S. government contracts as of March 31, 2019 and December 31, 2018:



$ in millions	Range of Reasonably Possible Future Costs⁽¹⁾	Accrued Costs⁽²⁾		Deferred Costs⁽³⁾
March 31, 2019	$460 - $836	$	473	$	353
December 31, 2018	447 - 835	461		343


⁽¹⁾	Estimated remediation costs are not discounted to present value. The range of reasonably possible future costs does not take into consideration amounts expected to be recoverable through overhead charges on U.S. government contracts.

⁽²⁾As of March 31, 2019, $172 million is recorded in Other current liabilities and $301 million is recorded in Other non-current liabilities.

⁽³⁾As of March 31, 2019, $139 million is deferred in Prepaid expenses and other current assets and $214 million is deferred in Other non-current assets.

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 unaudited condensed consolidated financial position as of March 31, 2019, or its annual results of operations and/or cash flows. With respect to Bethpage, as described in Note 6, we cannot at this time estimate the range of reasonably possible additional future costs that could result from potential changes to remediation standards or requirements to which we are subject.

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 March 31, 2019, there were $493 million of stand-by letters of credit and guarantees and $200 million of surety bonds outstanding.

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. At March 31, 2019, there were $1.0 billion of outstanding short-term commercial paper borrowings at a weighted-average interest rate of 3.04 percent that have original maturities of three months or less from the date of issuance. The outstanding balance of commercial paper borrowings is recorded in Other current liabilities in the unaudited condensed consolidated statements of financial position.

Credit Facilities

The company maintains a five-year senior unsecured credit facility in an aggregate principal amount of $2.0 billion (the “2018 Credit Agreement”) that matures in August 2023. At March 31, 2019, there was no balance outstanding under this facility; however, the outstanding balance of commercial paper borrowings reduces 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 $156 million as of March 31, 2019) (the “2016 Credit Agreement”). The company exercised the second option to extend the maturity to December 2020. The 2016 Credit Agreement is guaranteed by the company. At March 31, 2019, there was £70 million (the equivalent of approximately $91 million) outstanding under this facility, which bears interest at a rate of LIBOR plus 1.10 percent. All of the borrowings outstanding under this facility mature less than one year from the date of issuance, but may be renewed under the terms of the facility. Based on our intent and ability to refinance the obligations on a long-term basis, a large majority of the borrowings are classified as non-current.

At March 31, 2019, the company was in compliance with all covenants under its credit agreements.

Retirement Benefits (Unaudited)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

RETIREMENT BENEFITS

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



	Three Months Ended March 31
	Pension Benefits						OPB
$ in millions	2019			2018			2019			2018
Components of net periodic benefit cost
Service cost	$	92		$	99		$	4		$	5
Interest cost	340			290			20			19
Expected return on plan assets	(525		)	(529		)	(23		)	(25		)
Amortization of prior service credit	(15		)	(15		)	(1		)	(5		)
Net periodic benefit cost (benefit)	$	(108	)	$	(155	)	$	—		$	(6	)

Employer Contributions

The company sponsors defined benefit pension and OPB plans, as well as defined contribution plans. We fund our defined benefit pension plans annually in a manner consistent with the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006.

Contributions made by the company to its retirement plans are as follows:



	Three Months Ended March 31
$ in millions	2019		2018
Defined benefit pension plans	$	23	$	22
OPB plans	12		11
Defined contribution plans	191		104

Stock Compensation Plans and Other Compensation Arrangements (Unaudited)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK COMPENSATION PLANS AND OTHER COMPENSATION ARRANGEMENTS

Stock Awards

The following table presents the number of restricted stock rights (RSRs) and restricted performance stock rights (RPSRs) granted to employees under the company's long-term incentive stock plan and the grant date aggregate fair value of those stock awards for the periods presented:



	Three Months Ended March 31
in millions	2019		2018
RSRs granted	0.1		0.1
RPSRs granted	0.2		0.2
Grant date aggregate fair value	$	91	$	87

RSRs typically vest on the third anniversary of the grant date, while RPSRs generally vest and pay out based on the achievement of financial metrics over a three-year period.

Cash Awards

The following table presents the minimum and maximum aggregate payout amounts related to cash units (CUs) and cash performance units (CPUs) granted to employees in the periods presented:



	Three Months Ended March 31
$ in millions	2019		2018
Minimum aggregate payout amount	$	36	$	35
Maximum aggregate payout amount	203		196

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 on the achievement of financial metrics over a three-year period.

Leases (Unaudited) (Notes)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lessee, Operating and Finance Leases [Text Block]

LEASES

As described in Note 1, effective January 1, 2019, we adopted ASC 842 using the optional transition method. In accordance with the optional transition method, we did not recast the prior period unaudited condensed consolidated financial statements and all prior period amounts and disclosures are presented under ASC 840. Finance leases are not material to our unaudited condensed consolidated financial statements and are therefore not included in the following disclosures.

Total Lease Cost

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



$ in millions	Three Months Ended March 31, 2019
Operating lease cost	$	82
Variable lease cost	2
Short-term lease cost	17
Total lease cost	$	101

Supplemental Balance Sheet Information

Supplemental operating lease balance sheet information consists of the following:



$ in millions	March 31, 2019
Operating lease right-of-use assets	$	1,283

Other current liabilities	229
Operating lease liabilities	1,098
Total operating lease liabilities	$	1,327

Other Supplemental Information

Other supplemental operating lease information consists of the following:



$ in millions	Three Months Ended March 31, 2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	84
Right-of-use assets obtained in exchange for new lease liabilities	54

Weighted average remaining lease term	11.0 years
Weighted average discount rate	4.0		%

Maturities of Lease Liabilities

Maturities of operating lease liabilities as of March 31, 2019 were as follows:



$ in millions
Year Ending December 31
2019⁽¹⁾	$	208
2020	260
2021	207
2022	170
2023	134
Thereafter	737
Total lease payments	1,716
Less: imputed interest	(389		)
Present value of operating lease liabilities	$	1,327


⁽¹⁾	Excludes the three months endedMarch 31, 2019.

As of March 31, 2019, we have a rental commitment of $226 million for a real estate lease that has not yet commenced. This operating lease is expected to commence in the fourth quarter of 2019 with a lease term of approximately 17 years.

Rental expense for operating leases classified under ASC 840 for the three months ended March 31, 2018 was $92 million, net of immaterial amounts of sublease income. As of December 31, 2018, future minimum lease payments under long-term non-cancelable operating leases as classified under ASC 840 were as follows:



$ in millions
Year Ending December 31
2019	$	312
2020	270
2021	221
2022	186
2023	152
Thereafter	939
Total minimum lease payments	$	2,080

Segment Information (Unaudited)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

SEGMENT INFORMATION

The company is aligned in four operating sectors, which also comprise our reportable segments: Aerospace Systems, Innovation Systems, Mission Systems and Technology Services.

The following table presents sales and operating income by segment:



	Three Months Ended March 31
$ in millions	2019			2018
Sales
Aerospace Systems	$	3,496		$	3,280
Innovation Systems	1,438			—
Mission Systems	2,886			2,883
Technology Services	977			1,144
Intersegment eliminations	(608		)	(572		)
Total sales	8,189			6,735
Operating income
Aerospace Systems	382			341
Innovation Systems	167			—
Mission Systems	383			371
Technology Services	102			122
Intersegment eliminations	(67		)	(72		)
Total segment operating income	967			762
Net FAS (service)/CAS pension adjustment	108			127
Unallocated corporate expense	(139		)	(41		)
Total operating income	$	936		$	848

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 Federal Acquisition Regulation (FAR) and the related U.S. Government Cost Accounting Standards (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 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.

Disaggregation of Revenue



Sales by Customer Type	Three Months Ended March 31
	2019				2018
$ in millions	$		%⁽³⁾		$		%⁽³⁾
Aerospace Systems
U.S. government ⁽¹⁾	$	3,022	86	%	$	2,908	89	%
International ⁽²⁾	394		11	%	271		8	%
Other customers	34		1	%	42		1	%
Intersegment sales	46		2	%	59		2	%
Aerospace Systems sales	3,496		100	%	3,280		100	%
Innovation Systems
U.S. government ⁽¹⁾	1,015		71	%	—		—
International ⁽²⁾	247		17	%	—		—
Other customers	114		8	%	—		—
Intersegment sales	62		4	%	—		—
Innovation Systems sales	1,438		100	%	—		—
Mission Systems
U.S. government ⁽¹⁾	2,167		75	%	2,190		76	%
International ⁽²⁾	367		13	%	379		13	%
Other customers	34		1	%	30		1	%
Intersegment sales	318		11	%	284		10	%
Mission Systems sales	2,886		100	%	2,883		100	%
Technology Services
U.S. government ⁽¹⁾	553		57	%	602		53	%
International ⁽²⁾	209		21	%	220		19	%
Other customers	33		3	%	93		8	%
Intersegment sales	182		19	%	229		20	%
Technology Services sales	977		100	%	1,144		100	%
Total
U.S. government ⁽¹⁾	6,757		83	%	5,700		85	%
International ⁽²⁾	1,217		15	%	870		13	%
Other customers	215		2	%	165		2	%
Total Sales	$	8,189	100	%	$	6,735	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	Three Months Ended March 31
	2019				2018
$ in millions	$		%⁽¹⁾		$		%⁽¹⁾
Aerospace Systems
Cost-type	$	2,002	58	%	$	1,902	59	%
Fixed-price	1,448		42	%	1,319		41	%
Intersegment sales	46				59
Aerospace Systems sales	3,496				3,280
Innovation Systems
Cost-type	408		30	%	—		—
Fixed-price	968		70	%	—		—
Intersegment sales	62				—
Innovation Systems sales	1,438				—
Mission Systems
Cost-type	1,274		50	%	1,279		49	%
Fixed-price	1,294		50	%	1,320		51	%
Intersegment sales	318				284
Mission Systems sales	2,886				2,883
Technology Services
Cost-type	392		49	%	437		48	%
Fixed-price	403		51	%	478		52	%
Intersegment sales	182				229
Technology Services sales	977				1,144
Total
Cost-type	4,076		50	%	3,618		54	%
Fixed-price	4,113		50	%	3,117		46	%
Total Sales	$	8,189			$	6,735


⁽¹⁾	Percentages calculated based on external customer sales.



Sales by Geographic Region	Three Months Ended March 31
	2019				2018
$ in millions	$		%⁽²⁾		$		%⁽²⁾
Aerospace Systems
United States	$	3,056	89	%	$	2,950	92	%
Asia/Pacific	239		7	%	129		4	%
All other ⁽¹⁾	155		4	%	142		4	%
Intersegment sales	46				59
Aerospace Systems sales	3,496				3,280
Innovation Systems
United States	1,129		82	%	—		—
Asia/Pacific	45		3	%	—		—
All other ⁽¹⁾	202		15	%	—		—
Intersegment sales	62				—
Innovation Systems sales	1,438				—
Mission Systems
United States	2,201		86	%	2,220		85	%
Asia/Pacific	146		5	%	153		6	%
All other ⁽¹⁾	221		9	%	226		9	%
Intersegment sales	318				284
Mission Systems sales	2,886				2,883
Technology Services
United States	586		74	%	695		76	%
Asia/Pacific	38		4	%	32		3	%
All other ⁽¹⁾	171		22	%	188		21	%
Intersegment sales	182				229
Technology Services sales	977				1,144
Total
United States	6,972		85	%	5,865		87	%
Asia/Pacific	468		6	%	314		5	%
All other ⁽¹⁾	749		9	%	556		8	%
Total Sales	$	8,189			$	6,735


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


⁽²⁾	Percentages calculated based on external customer sales.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation	These unaudited condensed consolidated financial statements (the “financial statements”) include the accounts of Northrop Grumman Corporation and its subsidiaries and joint ventures or other investments for which we consolidate the financial results (herein referred to as “Northrop Grumman,” the “company,” “we,” “us,” or “our”). Material 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	These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP” or “FAS”) and in accordance with the rules of the Securities and Exchange Commission (SEC) for interim reporting. The financial statements include adjustments of a normal recurring nature considered necessary by management for a fair presentation of the company’s unaudited condensed consolidated financial position, results of operations and cash flows. The results reported in these financial statements are not necessarily indicative of results that may be expected for the entire year. These financial statements should be read in conjunction with the information contained in the company’s 2018 Annual Report on Form 10-K
Fiscal Period Policy	The quarterly information is labeled using a calendar convention; that is, first quarter is consistently labeled as ending on March 31, second quarter as ending on June 30 and third quarter as ending on September 30. It is legacy Northrop Grumman’s long-standing practice to establish actual interim closing dates using a “fiscal” calendar, in which we close our books on a Friday near these quarter-end dates in order to normalize the potentially disruptive effects of quarterly closings on business processes. Similarly, Innovation Systems uses a “fiscal” calendar by closing its books on a Sunday near these quarter-end dates and will continue this practice until its business processes are aligned with legacy Northrop Grumman’s. This practice is only used at interim periods within a reporting year.
Accounting Estimates	Preparation of the financial statements 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 from Contract with Customer	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 revenue 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. Each loss provision is first offset against costs included in Unbilled receivables or Inventoried costs; remaining amounts are reflected in Other current liabilities. Significant EAC adjustments on a single contract could have a material effect on the company’s financial statements. 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 unaudited condensed 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 unaudited condensed 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. The majority of our sales are derived from long-term contracts with the U.S. government for the 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 contract. 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 lifecycle (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 a cost plus a reasonable margin approach. 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. Our accounting for 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. As control is effectively transferred while we perform on our contracts, we generally recognize revenue over time using the cost-to-cost method (cost incurred relative to total cost estimated at completion) as 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).
Leases	The company leases certain buildings, land and equipment. Under ASC 842, at contract inception we determine whether the contract is or contains a lease and whether the lease should be classified as an operating or a financing lease. Operating leases are included in Operating lease right-of-use (ROU) assets, Other current liabilities, and Operating lease liabilities in our unaudited condensed consolidated statements of financial position. The company recognizes operating lease ROU 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. In our adoption of ASC 842, we elected not to 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, if the incentive is determined to be a leasehold improvement owned by the lessee, the company generally records a deferred rent liability and amortizes the deferred rent over the term of the lease as a reduction to rent expense. 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.
Restricted Cash	On occasion, we are required to maintain cash deposits with banks in connection with certain contingent obligations. This restricted cash is included in Prepaid expenses and other current assets in the unaudited condensed consolidated statements of financial position.
Pension and Other Postretirement Plans	We fund our defined benefit pension plans annually in a manner consistent with the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006
Earnings Per Share	Diluted earnings per share include the dilutive effect of awards granted to employees under stock-based compensation plans. We calculate basic earnings per share by dividing net earnings by the weighted-average number of shares of common stock outstanding during each period.
Investments in Marketable Securities	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; and therefore are not required to be categorized in the fair value hierarchy table
Derivative Financial Instruments and Hedging Activities	Commodity derivatives are valued based on prices of future exchanges and recently reported transactions in the marketplace. 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.
Fair Value of Long-term Debt	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.
U.S. Government Cost Claims	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.
New Accounting Pronouncements and Changes in Accounting Principles	On February 25, 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASC Topic 842 supersedes existing lease guidance, including ASC 840 - Leases. Among other things, ASU 2016-02 requires recognition of a right-of-use asset and liability for future lease payments for contracts that meet the definition of a lease and requires disclosure of certain information about leasing arrangements. On July 30, 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which, among other things, allows companies to elect an optional transition method to apply the new lease standard through a cumulative-effect adjustment in the period of adoption. We adopted the standard on January 1, 2019 using the optional transition method and, as a result, did not recast prior period unaudited condensed comparative financial statements. All prior period amounts and disclosures are presented under ASC 840. We elected the package of practical expedients, which, among other things, allows us to carry forward our prior lease classifications under ASC 840. We did not elect to adopt the hindsight practical expedient and are therefore maintaining the lease terms we previously determined under ASC 840. Adoption of the new standard resulted in the recording of additional lease assets and lease liabilities on the unaudited condensed consolidated statements of financial position with no cumulative impact to retained earnings and did not have a material impact on our results of operations or cash flows.

Basis of Presentation (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Change in Accounting Estimate [Table Text Block]

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



	Three Months Ended March 31
$ in millions, except per share data	2019		2018
Operating income	$	138	$	116
Net earnings⁽¹⁾	109		92
Diluted earnings per share⁽¹⁾	0.64		0.52


⁽¹⁾	Based on a 21 percent statutory tax rate

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows:



$ in millions	March 31, 2019			December 31, 2018
Unamortized prior service credit, net of tax expense of $28 for 2019 and $32 for 2018	$	87		$	98
Cumulative translation adjustment	(143		)	(144		)
Other, net	(3		)	(6		)
Total accumulated other comprehensive loss	$	(59	)	$	(52	)

Business Acquisition (Unaudited) Business Acquisition (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2019

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 preliminary purchase price allocation table presents the company’s refined estimate 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	1,264
Inventoried costs	220
Other current assets	226
Property, plant and equipment	1,509
Goodwill	6,248
Intangible assets	1,525
Other non-current assets	151
Total assets acquired	11,824
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	(253		)
Other non-current liabilities	(189		)
Total liabilities assumed	(4,082		)
Total purchase price	$	7,742


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

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

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

Business Acquisition, Pro Forma Information [Table Text Block]



$ in millions, except per share amounts	Three Months Ended March 31, 2018
Sales	$	8,000
Net earnings	914
Diluted earnings per share	5.21

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

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Share Repurchases

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



							Shares Repurchased (in millions)
Repurchase Program Authorization Date	Amount Authorized (in millions)		Total Shares Retired (in millions)	Average Price Per Share⁽¹⁾		Date Completed	Three Months Ended March 31
Repurchase Program Authorization Date	Amount Authorized (in millions)		Total Shares Retired (in millions)	Average Price Per Share⁽¹⁾		Date Completed	2019	2018
September 16, 2015	$	4,000	12.4	$	241.36		1.1	—
December 4, 2018	$	3,000	—	$	—		—	—


⁽¹⁾	Includes commissions paid.

Income Taxes (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense and Effective Income Tax Rates



	Three Months Ended March 31
$ in millions	2019			2018
Federal and foreign income tax expense	$	171		$	159
Effective income tax rate	16.5		%	15.9		%

Fair Value of Financial Instruments (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair value information of assets and liabilities measured at fair value on a recurring basis

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:



	March 31, 2019								December 31, 2018
$ in millions	Level 1		Level 2			Total			Level 1		Level 2			Total
Financial Assets (Liabilities)
Marketable securities	$	347	$	—		$	347		$	319	$	1		$	320
Marketable securities valued using NAV	—		—			16			—		—			15
Total marketable securities	347		—			363			319		1			335
Derivatives	—		(5		)	(5		)	—		(10		)	(10		)

Commitments and Contingencies (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2019

Environmental Remediation Range of Future Costs [Line Items]

Environmental Remediation [Table Text Block]



$ in millions	Range of Reasonably Possible Future Costs⁽¹⁾	Accrued Costs⁽²⁾		Deferred Costs⁽³⁾
March 31, 2019	$460 - $836	$	473	$	353
December 31, 2018	447 - 835	461		343


⁽¹⁾	Estimated remediation costs are not discounted to present value. The range of reasonably possible future costs does not take into consideration amounts expected to be recoverable through overhead charges on U.S. government contracts.

⁽²⁾As of March 31, 2019, $172 million is recorded in Other current liabilities and $301 million is recorded in Other non-current liabilities.

⁽³⁾As of March 31, 2019, $139 million is deferred in Prepaid expenses and other current assets and $214 million is deferred in Other non-current assets.

Retirement Benefits (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Components of net periodic benefit cost

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



	Three Months Ended March 31
	Pension Benefits						OPB
$ in millions	2019			2018			2019			2018
Components of net periodic benefit cost
Service cost	$	92		$	99		$	4		$	5
Interest cost	340			290			20			19
Expected return on plan assets	(525		)	(529		)	(23		)	(25		)
Amortization of prior service credit	(15		)	(15		)	(1		)	(5		)
Net periodic benefit cost (benefit)	$	(108	)	$	(155	)	$	—		$	(6	)

Employer contributions to retirement plans

Contributions made by the company to its retirement plans are as follows:



	Three Months Ended March 31
$ in millions	2019		2018
Defined benefit pension plans	$	23	$	22
OPB plans	12		11
Defined contribution plans	191		104

Stock Compensation Plans and Other Compensation Arrangements (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Nonvested Restricted Stock Shares Activity [Table Text Block]



	Three Months Ended March 31
in millions	2019		2018
RSRs granted	0.1		0.1
RPSRs granted	0.2		0.2
Grant date aggregate fair value	$	91	$	87

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 cash units (CUs) and cash performance units (CPUs) granted to employees in the periods presented:



	Three Months Ended March 31
$ in millions	2019		2018
Minimum aggregate payout amount	$	36	$	35
Maximum aggregate payout amount	203		196

Leases (Unaudited) Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lease, Cost [Table Text Block]

Total lease cost is comprised of the following:



$ in millions	Three Months Ended March 31, 2019
Operating lease cost	$	82
Variable lease cost	2
Short-term lease cost	17
Total lease cost	$	101

Supplemental Balance Sheet Disclosures [Text Block]

Supplemental operating lease balance sheet information consists of the following:



$ in millions	March 31, 2019
Operating lease right-of-use assets	$	1,283

Other current liabilities	229
Operating lease liabilities	1,098
Total operating lease liabilities	$	1,327

Other Supplemental Lease Information [Table Text Block]

Other supplemental operating lease information consists of the following:



$ in millions	Three Months Ended March 31, 2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	84
Right-of-use assets obtained in exchange for new lease liabilities	54

Weighted average remaining lease term	11.0 years
Weighted average discount rate	4.0		%

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

Maturities of operating lease liabilities as of March 31, 2019 were as follows:



$ in millions
Year Ending December 31
2019⁽¹⁾	$	208
2020	260
2021	207
2022	170
2023	134
Thereafter	737
Total lease payments	1,716
Less: imputed interest	(389		)
Present value of operating lease liabilities	$	1,327


⁽¹⁾	Excludes the three months endedMarch 31, 2019.

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

As of December 31, 2018, future minimum lease payments under long-term non-cancelable operating leases as classified under ASC 840 were as follows:



$ in millions
Year Ending December 31
2019	$	312
2020	270
2021	221
2022	186
2023	152
Thereafter	939
Total minimum lease payments	$	2,080

Segment Information (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Sales and operating income by segment

The following table presents sales and operating income by segment:



	Three Months Ended March 31
$ in millions	2019			2018
Sales
Aerospace Systems	$	3,496		$	3,280
Innovation Systems	1,438			—
Mission Systems	2,886			2,883
Technology Services	977			1,144
Intersegment eliminations	(608		)	(572		)
Total sales	8,189			6,735
Operating income
Aerospace Systems	382			341
Innovation Systems	167			—
Mission Systems	383			371
Technology Services	102			122
Intersegment eliminations	(67		)	(72		)
Total segment operating income	967			762
Net FAS (service)/CAS pension adjustment	108			127
Unallocated corporate expense	(139		)	(41		)
Total operating income	$	936		$	848

Revenue by Major Customers by Reporting Segments



Sales by Customer Type	Three Months Ended March 31
	2019				2018
$ in millions	$		%⁽³⁾		$		%⁽³⁾
Aerospace Systems
U.S. government ⁽¹⁾	$	3,022	86	%	$	2,908	89	%
International ⁽²⁾	394		11	%	271		8	%
Other customers	34		1	%	42		1	%
Intersegment sales	46		2	%	59		2	%
Aerospace Systems sales	3,496		100	%	3,280		100	%
Innovation Systems
U.S. government ⁽¹⁾	1,015		71	%	—		—
International ⁽²⁾	247		17	%	—		—
Other customers	114		8	%	—		—
Intersegment sales	62		4	%	—		—
Innovation Systems sales	1,438		100	%	—		—
Mission Systems
U.S. government ⁽¹⁾	2,167		75	%	2,190		76	%
International ⁽²⁾	367		13	%	379		13	%
Other customers	34		1	%	30		1	%
Intersegment sales	318		11	%	284		10	%
Mission Systems sales	2,886		100	%	2,883		100	%
Technology Services
U.S. government ⁽¹⁾	553		57	%	602		53	%
International ⁽²⁾	209		21	%	220		19	%
Other customers	33		3	%	93		8	%
Intersegment sales	182		19	%	229		20	%
Technology Services sales	977		100	%	1,144		100	%
Total
U.S. government ⁽¹⁾	6,757		83	%	5,700		85	%
International ⁽²⁾	1,217		15	%	870		13	%
Other customers	215		2	%	165		2	%
Total Sales	$	8,189	100	%	$	6,735	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.

⁽³⁾ Percentages calculated based on total segment sales.

Revenue from External Customers by Contract Type



Sales by Contract Type	Three Months Ended March 31
	2019				2018
$ in millions	$		%⁽¹⁾		$		%⁽¹⁾
Aerospace Systems
Cost-type	$	2,002	58	%	$	1,902	59	%
Fixed-price	1,448		42	%	1,319		41	%
Intersegment sales	46				59
Aerospace Systems sales	3,496				3,280
Innovation Systems
Cost-type	408		30	%	—		—
Fixed-price	968		70	%	—		—
Intersegment sales	62				—
Innovation Systems sales	1,438				—
Mission Systems
Cost-type	1,274		50	%	1,279		49	%
Fixed-price	1,294		50	%	1,320		51	%
Intersegment sales	318				284
Mission Systems sales	2,886				2,883
Technology Services
Cost-type	392		49	%	437		48	%
Fixed-price	403		51	%	478		52	%
Intersegment sales	182				229
Technology Services sales	977				1,144
Total
Cost-type	4,076		50	%	3,618		54	%
Fixed-price	4,113		50	%	3,117		46	%
Total Sales	$	8,189			$	6,735


⁽¹⁾	Percentages calculated based on external customer sales.

Revenue from External Customers by Geographic Areas



Sales by Geographic Region	Three Months Ended March 31
	2019				2018
$ in millions	$		%⁽²⁾		$		%⁽²⁾
Aerospace Systems
United States	$	3,056	89	%	$	2,950	92	%
Asia/Pacific	239		7	%	129		4	%
All other ⁽¹⁾	155		4	%	142		4	%
Intersegment sales	46				59
Aerospace Systems sales	3,496				3,280
Innovation Systems
United States	1,129		82	%	—		—
Asia/Pacific	45		3	%	—		—
All other ⁽¹⁾	202		15	%	—		—
Intersegment sales	62				—
Innovation Systems sales	1,438				—
Mission Systems
United States	2,201		86	%	2,220		85	%
Asia/Pacific	146		5	%	153		6	%
All other ⁽¹⁾	221		9	%	226		9	%
Intersegment sales	318				284
Mission Systems sales	2,886				2,883
Technology Services
United States	586		74	%	695		76	%
Asia/Pacific	38		4	%	32		3	%
All other ⁽¹⁾	171		22	%	188		21	%
Intersegment sales	182				229
Technology Services sales	977				1,144
Total
United States	6,972		85	%	5,865		87	%
Asia/Pacific	468		6	%	314		5	%
All other ⁽¹⁾	749		9	%	556		8	%
Total Sales	$	8,189			$	6,735


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


⁽²⁾	Percentages calculated based on external customer sales.

Basis of Presentation (Unaudited) (Details 1) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Change in Accounting Estimate [Line Items]
Operating income	$ 936	$ 848
Net earnings	$ 863	$ 840
Earnings Per Share, Diluted	$ 5.06	$ 4.79
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 166	$ 133
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	138	116
Net earnings	$ 109	$ 92
Earnings Per Share, Diluted	$ 0.64	$ 0.52

- 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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
-Subparagraph (a)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
-Subparagraph (SX 210.9-04(23))
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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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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 2
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-Subparagraph (d)
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-Section S99
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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

Basis of Presentation (Unaudited) (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Change in Contract with Customer, Liability [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 674	$ 706
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 57,300
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation	We expect to recognize approximately 50 percent and 75 percent of our March 31, 2019 backlog as revenue over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter.

Basis of Presentation (Unaudited) (Details 3) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted Cash	$ 93,000,000	$ 0

Basis of Presentation (Unaudited) (Details 4) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Prior Service Cost (Credit), after Tax	$ 87		$ 98
Cumulative translation adjustment	(143)		(144)
Other, net	(3)		(6)
Total accumulated other comprehensive loss	(59)		(52)
Unamortized prior service credit, tax expense	28		$ 32
Unamortized prior service credit, reclassified from accumulated other comprehensive loss to net earnings	$ 11	$ 15

Business Acquisition (Unaudited) (Details 1) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
	Jun. 06, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles		$ 220
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other current liabilities		114
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Pension and other post-retirement benefit plan liabilities		56
Business Combination, Provisional, Initial Accounting Incomplete, Adjustments, Other Non-Current Liabilities		53
Goodwill		18,698	$ 18,672
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill		$ (47)
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, net	596
Unbilled receivables, net	1,264
Inventoried costs, net	220
Other current assets	226
Property, plant, and equipment	1,509
Goodwill	6,248
Intangible assets	1,525
Other non-current assets	151
Total assets acquired	11,824
Trade accounts payable	(397)
Accrued employee compensation	(158)
Advance payments and billings in excess of costs incurred	(222)
Below market contracts	(151)
Other current liabilities	(412)
Long-term debt	(1,687)
Pension and other postretirement benefit plan liabilities	(613)
Deferred Tax Liabilities	(253)
Other non-current liabilities	(189)
Total liabilities assumed	(4,082)
Total purchase price	$ 7,742

Business Acquisition (Unaudited) (Details 2) $ in Millions	Jun. 06, 2018 USD ($)
Orbital ATK [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1,525
Customer Contracts [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1,245
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 280
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years

Business Acquisition (Unaudited) (Details 3) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares
Business Acquisition [Line Items]
Pro forma sales	$ 8,000
Pro forma net earnings	$ 914
Pro forma diluted earnings per share \| $ / shares	$ 5.21
Pro Forma Adjustments, Orbital ATK intercompany sales elimination	$ (47)
Pro Forma Adjustments, Elimination of nonrecurring transaction costs	7
Pro Forma Adjustments, Additional depreciation expense, net of removal of historical depreciation	(6)
Pro Forma Adjustments, Additional amortization expense, net of removal of historical amortization expense	(66)
Pro Forma Adjustments, Elimination of Orbital ATK’s amortization on net actuarial losses and prior service costs and pension/post-retirement costs	31
Income Tax Effects of Pro Forma Adjustments	$ 7

Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		36 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Dec. 04, 2018	Sep. 16, 2015
September 2015 Share Repurchase Program Original Authorization
Share Repurchase [Line Items]
Amount Authorized					$ 4,000
Shares Retired			12.4
Average Cost Per Share			$ 241.36
Shares Repurchased	1.1	0.0
Share Repurchases - Notes to Table
Shares repurchased amount			$ 3,000
Amount remaining under authorization for share repurchases	$ 1,000		$ 1,000
December 2018 Share Repurchase Original Authorization [Member]
Share Repurchase [Line Items]
Amount Authorized				$ 3,000
Shares Retired	0.0
Average Cost Per Share	$ 0.00

Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) (Details 2) - $ / shares shares in Millions	1 Months Ended			3 Months Ended
	May 31, 2018	Jan. 31, 2018	May 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Dilutive effect of of stock awards and options granted to employees under stock-based compensation plans				0.7	1.1
Common stock dividends per share, declared (in dollars per share)	$ 1.20	$ 1.10	$ 1.00	$ 1.20	$ 1.10
Increase in quarterly common stock dividend (percent)	9.00%	10.00%

Income Taxes (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Federal and foreign income tax expense	$ 171	$ 159
Effective income tax rate	16.50%	15.90%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 31	$ 20
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	$ 13	26
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount		$ 8

Income Taxes (Unaudited) (Details 2) $ in Millions	3 Months Ended
Income Taxes (Unaudited) (Details 2) $ in Millions	Mar. 31, 2019 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increase resulting from 2017 Tax Act	$ 15
Increase in Unrecognized Tax Benefits is Reasonably Possible	$ 70

Fair Value of Financial Instruments (Unaudited) (Details 1) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	$ 363	$ 335
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	347	319
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	0	1
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	347	320
Derivatives	(5)	(10)
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	347	319
Derivatives	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	0	1
Derivatives	(5)	(10)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	16	15
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	0	0
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	$ 0	$ 0

Fair Value of Financial Instruments (Unaudited) (Details 2) lb in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) lb	Dec. 31, 2018 USD ($)
Copper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Nonmonetary Notional Amount, Mass \| lb	19
Zinc [Member] [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Nonmonetary Notional Amount, Mass \| lb	7
Foreign Exchange Forward [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, Notional Amount \| $	$ 111	$ 114
Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, Notional Amount \| $	$ 12	$ 0

Fair Value of Financial Instruments (Unaudited) Fair Value of Financial Instruments (Unaudited) (Details 3) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Jun. 06, 2018
Business Acquisition [Line Items]
Long-term Debt, Fair Value	$ 14,800	$ 14,300
Debt and Capital Lease Obligations	$ 14,400	$ 14,400
Orbital ATK [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			$ 1,687

Investigations, Claims and Litigation (Unaudited) (Details) € in Millions, R$ in Millions, $ in Millions		12 Months Ended	63 Months Ended		66 Months Ended			68 Months Ended		70 Months Ended
	Dec. 28, 2018	Dec. 31, 2007 USD ($)	Nov. 13, 2018 BRL (R$)	Nov. 13, 2018 USD ($)	Mar. 31, 2019 EUR (€)	Mar. 31, 2019 BRL (R$)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 BRL (R$) Defendant	Mar. 31, 2019 USD ($) Defendant	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 16, 2018 USD ($)	May 04, 2012 USD ($)
Loss Contingencies
Unbilled receivables, net							$ 5,785		$ 5,785	$ 5,785	$ 5,026
Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Damages Sought, Value								R$ 111	$ 28
Counterclaim					€ 31		35
Loss Contingency, Damages Awarded, Value			R$ 41	$ 10
Orbital ATK [Domain]
Loss Contingencies
Loss Contingency, Settlement Agreement, Terms	108
Unpaid Portions of Contract Price and Direct Costs Incurred [Member] \| United States Postal Service
Loss Contingencies
Unbilled receivables, net													$ 63
Acts and Omissions with Adverse Affects on Performance and Obligations [Member] \| United States Postal Service
Loss Contingencies
Gain contingency, unrecorded amount													$ 115
United States Postal Service
Loss Contingencies
Contract award		$ 875
United States Postal Service \| False Claims Act \| Threatened Litigation
Loss Contingencies
Loss Contingency, Damages Sought, Value										179
Solystic Matter [Member] \| Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Number of Additional Defendants \| Defendant								2	2
Initial Claim [Member] \| Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Damages Sought, Value								R$ 89	$ 23
Incremental claim [Member] \| Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Damages Sought, Value						R$ 22	6
Maximum \| United States Postal Service
Loss Contingencies
Loss Contingency, Estimate of Possible Loss							$ 410		$ 410	$ 410
Updated claim [Member] \| United States Postal Service
Loss Contingencies
Loss Contingency, Estimate of Possible Loss												$ 193

Commitments and Contingencies (Unaudited) (Details) £ in Millions	3 Months Ended
	Mar. 31, 2019 GBP (£) Rate	Mar. 31, 2019 USD ($) Rate	Dec. 31, 2018 USD ($)
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs		$ 473,000,000	$ 461,000,000
Recorded Third-Party Environmental Recoveries, Amount		353,000,000	343,000,000
Financial Arrangements
Standby Unused Letters Of Credit and bank guarantees		493,000,000
Surety Bond Outstanding		200,000,000
Line of Credit Facility [Line Items]
Debt Instrument, Covenant Compliance	the company was in compliance with all covenants under its credit agreements.
Short Term Debt, Maximum Borrowing Capacity		2,000,000,000
Commercial Paper		$ 1,000,000,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time \| Rate	3.04%	3.04%
Debt Instrument, Term	3 months
Two Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	£ 120	$ 156,000,000
Line of Credit Outstanding	£ 70	91,000,000
Five Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		2,000,000,000
Line of Credit Outstanding		0
London Interbank Offered Rate (LIBOR) [Member] \| Two Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate During Period \| Rate	1.10%
Other Current Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs		172,000,000
Other Noncurrent Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs		301,000,000
Other Current Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount		139,000,000
Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount		214,000,000
Environmental Issue [Member] \| Maximum
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss		836,000,000	835,000,000
Environmental Issue [Member] \| Minimum
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss		$ 460,000,000	$ 447,000,000

Retirement Benefits (Unaudited) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Contribution Plan [Abstract]
Defined contribution plan, employer contributions	$ 191	$ 104
Pension Benefits
Components of Net Periodic Benefit Cost
Service cost	92	99
Interest cost	340	290
Expected return on plan assets	(525)	(529)
Amortization of prior service credit	(15)	(15)
Net periodic benefit cost (benefit)	(108)	(155)
Defined benefit plan, contributions by Employer	23	22
OPB
Components of Net Periodic Benefit Cost
Service cost	4	5
Interest cost	20	19
Expected return on plan assets	(23)	(25)
Amortization of prior service credit	(1)	(5)
Net periodic benefit cost (benefit)	0	(6)
Defined benefit plan, contributions by Employer	$ 12	$ 11

Stock Compensation Plans and Other Compensation Arrangements (Unaudited) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Rights and Restricted Performance Stock Rights Grant Date Aggregate Fair Value	$ 91	$ 87
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0.1	0.1
Vesting period	3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0.2	0.2
Vesting period	3 years
Cash Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Cash Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Cash Units and Cash Performance Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	$ 36	$ 35
Cash Units and Cash Performance Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	$ 203	$ 196

Leases (Unaudited) Total Lease Cost (Details) $ in Millions	3 Months Ended
Leases (Unaudited) Total Lease Cost (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating Lease Cost	$ 82
Variable Lease Cost	2
Short-term Lease Cost	17
Total Lease Cost	$ 101

Leases (Unaudited) Lease Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	$ 1,283	$ 0
Operating Lease, Liability, Current	229
Operating lease liabilities	1,098	$ 0
Operating Lease, Liability	$ 1,327

Leases (Unaudited) Lease Other Supplemental Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) Rate
Leases Other Supplemental Information [Abstract]
Payments on operating leases	$ 84
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 54
Weighted-average remaining lease term—operating leases (in years)	11 years
Weighted-average discount rate—operating leases \| Rate	4.00%

Leases (Unaudited) Lease Maturities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Lease Maturities [Abstract]
Remainder of 2019	$ 208
2020	260
2021	207
2022	170
2023	134
Thereafter	737
Total lease payments	1,716
Less: Imputed Interest	(389)
Present value of operating lease liabilities	1,327
Lessee, Operating Lease, Lease Not yet Commenced, Value	$ 226
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	17 years

Leases (Unaudited) Future Minimum Lease Payments Under 840 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2018
Future Minimum Lease Payments Under 840 [Abstract]
Operating Leases, Rent Expense	$ 92
Operating Leases, Future Minimum Payments Due, Next Twelve Months		$ 312
Operating Leases, Future Minimum Payments, Due in Two Years		270
Operating Leases, Future Minimum Payments, Due in Three Years		221
Operating Leases, Future Minimum Payments, Due in Four Years		186
Operating Leases, Future Minimum Payments, Due in Five Years		152
Operating Leases, Future Minimum Payments, Due Thereafter		939
Operating Leases, Future Minimum Payments Due		$ 2,080

Segment Information (Unaudited) (Details 1) $ in Millions	3 Months Ended
Segment Information (Unaudited) (Details 1) $ in Millions	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	4
Sales	$ 8,189	$ 6,735
Operating income	936	848
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	967	762
Operating Segments [Member] \| Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Sales	3,496	3,280
Operating income	382	341
Operating Segments [Member] \| Innovation Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,438	0
Operating income	167	0
Operating Segments [Member] \| Mission Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,886	2,883
Operating income	383	371
Operating Segments [Member] \| Technology Services [Member]
Segment Reporting Information [Line Items]
Sales	977	1,144
Operating income	102	122
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	608	572
Operating income	67	72
Net FAS (service)/CAS pension adjustment [Member]
Segment Reporting Information [Line Items]
Operating income	108	127
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	$ (139)	$ (41)

Segment Information (Unaudited) (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Major Customer [Line Items]
Sales	$ 8,189	$ 6,735
Concentration Risk, Percentage	100.00%	100.00%
US Government [Member]
Revenue, Major Customer [Line Items]
Sales	$ 6,757	$ 5,700
Concentration Risk, Percentage	83.00%	85.00%
US Government [Member] \| Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 3,022	$ 2,908
Concentration Risk, Percentage	86.00%	89.00%
US Government [Member] \| Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,015	$ 0
Concentration Risk, Percentage	71.00%	0.00%
US Government [Member] \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 2,167	$ 2,190
Concentration Risk, Percentage	75.00%	76.00%
US Government [Member] \| Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 553	$ 602
Concentration Risk, Percentage	57.00%	53.00%
International Customer [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,217	$ 870
Concentration Risk, Percentage	15.00%	13.00%
International Customer [Member] \| Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 394	$ 271
Concentration Risk, Percentage	11.00%	8.00%
International Customer [Member] \| Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 247	$ 0
Concentration Risk, Percentage	17.00%	0.00%
International Customer [Member] \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 367	$ 379
Concentration Risk, Percentage	13.00%	13.00%
International Customer [Member] \| Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 209	$ 220
Concentration Risk, Percentage	21.00%	19.00%
Other Customers [Member]
Revenue, Major Customer [Line Items]
Sales	$ 215	$ 165
Concentration Risk, Percentage	2.00%	2.00%
Other Customers [Member] \| Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 34	$ 42
Concentration Risk, Percentage	1.00%	1.00%
Other Customers [Member] \| Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 114	$ 0
Concentration Risk, Percentage	8.00%	0.00%
Other Customers [Member] \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 34	$ 30
Concentration Risk, Percentage	1.00%	1.00%
Other Customers [Member] \| Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 33	$ 93
Concentration Risk, Percentage	3.00%	8.00%
Intersegment Eliminations [Member] \| Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 46	$ 59
Concentration Risk, Percentage	2.00%	2.00%
Intersegment Eliminations [Member] \| Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 62	$ 0
Concentration Risk, Percentage	4.00%	0.00%
Intersegment Eliminations [Member] \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 318	$ 284
Concentration Risk, Percentage	11.00%	10.00%
Intersegment Eliminations [Member] \| Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 182	$ 229
Concentration Risk, Percentage	19.00%	20.00%
Operating Segments [Member] \| Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 3,496	$ 3,280
Concentration Risk, Percentage	100.00%	100.00%
Operating Segments [Member] \| Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,438	$ 0
Concentration Risk, Percentage	100.00%	0.00%
Operating Segments [Member] \| Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 2,886	$ 2,883
Concentration Risk, Percentage	100.00%	100.00%
Operating Segments [Member] \| Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 977	$ 1,144
Concentration Risk, Percentage	100.00%	100.00%

Segment Information (Unaudited) (Details 3) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Contract Type [Line Items]
Sales	$ 8,189	$ 6,735
Concentration Risk, Percentage	100.00%	100.00%
Cost-type [Member]
Revenue, Contract Type [Line Items]
Sales	$ 4,076	$ 3,618
Concentration Risk, Percentage	50.00%	54.00%
Cost-type [Member] \| Aerospace Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 2,002	$ 1,902
Concentration Risk, Percentage	58.00%	59.00%
Cost-type [Member] \| Innovation Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 408	$ 0
Concentration Risk, Percentage	30.00%	0.00%
Cost-type [Member] \| Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,274	$ 1,279
Concentration Risk, Percentage	50.00%	49.00%
Cost-type [Member] \| Technology Services [Member]
Revenue, Contract Type [Line Items]
Sales	$ 392	$ 437
Concentration Risk, Percentage	49.00%	48.00%
Fixed-price [Member]
Revenue, Contract Type [Line Items]
Sales	$ 4,113	$ 3,117
Concentration Risk, Percentage	50.00%	46.00%
Fixed-price [Member] \| Aerospace Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,448	$ 1,319
Concentration Risk, Percentage	42.00%	41.00%
Fixed-price [Member] \| Innovation Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 968	$ 0
Concentration Risk, Percentage	70.00%	0.00%
Fixed-price [Member] \| Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,294	$ 1,320
Concentration Risk, Percentage	50.00%	51.00%
Fixed-price [Member] \| Technology Services [Member]
Revenue, Contract Type [Line Items]
Sales	$ 403	$ 478
Concentration Risk, Percentage	51.00%	52.00%
Intersegment Eliminations [Member] \| Aerospace Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 46	$ 59
Intersegment Eliminations [Member] \| Innovation Systems [Member]
Revenue, Contract Type [Line Items]
Sales	62	0
Intersegment Eliminations [Member] \| Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales	318	284
Intersegment Eliminations [Member] \| Technology Services [Member]
Revenue, Contract Type [Line Items]
Sales	182	229
Operating Segments [Member] \| Aerospace Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 3,496	$ 3,280
Concentration Risk, Percentage	100.00%	100.00%
Operating Segments [Member] \| Innovation Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 1,438	$ 0
Concentration Risk, Percentage	100.00%	0.00%
Operating Segments [Member] \| Mission Systems [Member]
Revenue, Contract Type [Line Items]
Sales	$ 2,886	$ 2,883
Concentration Risk, Percentage	100.00%	100.00%
Operating Segments [Member] \| Technology Services [Member]
Revenue, Contract Type [Line Items]
Sales	$ 977	$ 1,144
Concentration Risk, Percentage	100.00%	100.00%

Segment Information (Unaudited) (Details 4) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Geographic Location [Line Items]
Sales	$ 8,189	$ 6,735
Concentration Risk, Percentage	100.00%	100.00%
United States
Revenue, Geographic Location [Line Items]
Sales	$ 6,972	$ 5,865
Concentration Risk, Percentage	85.00%	87.00%
United States \| Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 3,056	$ 2,950
Concentration Risk, Percentage	89.00%	92.00%
United States \| Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 1,129	$ 0
Concentration Risk, Percentage	82.00%	0.00%
United States \| Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 2,201	$ 2,220
Concentration Risk, Percentage	86.00%	85.00%
United States \| Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 586	$ 695
Concentration Risk, Percentage	74.00%	76.00%
Asia/Pacific
Revenue, Geographic Location [Line Items]
Sales	$ 468	$ 314
Concentration Risk, Percentage	6.00%	5.00%
Asia/Pacific \| Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 239	$ 129
Concentration Risk, Percentage	7.00%	4.00%
Asia/Pacific \| Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 45	$ 0
Concentration Risk, Percentage	3.00%	0.00%
Asia/Pacific \| Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 146	$ 153
Concentration Risk, Percentage	5.00%	6.00%
Asia/Pacific \| Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 38	$ 32
Concentration Risk, Percentage	4.00%	3.00%
All other
Revenue, Geographic Location [Line Items]
Sales	$ 749	$ 556
Concentration Risk, Percentage	9.00%	8.00%
All other \| Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 155	$ 142
Concentration Risk, Percentage	4.00%	4.00%
All other \| Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 202	$ 0
Concentration Risk, Percentage	15.00%	0.00%
All other \| Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 221	$ 226
Concentration Risk, Percentage	9.00%	9.00%
All other \| Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 171	$ 188
Concentration Risk, Percentage	22.00%	21.00%
Intersegment Eliminations [Member] \| Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 46	$ 59
Intersegment Eliminations [Member] \| Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	62	0
Intersegment Eliminations [Member] \| Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	318	284
Intersegment Eliminations [Member] \| Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	182	229
Operating Segments [Member] \| Aerospace Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 3,496	$ 3,280
Concentration Risk, Percentage	100.00%	100.00%
Operating Segments [Member] \| Innovation Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 1,438	$ 0
Concentration Risk, Percentage	100.00%	0.00%
Operating Segments [Member] \| Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 2,886	$ 2,883
Concentration Risk, Percentage	100.00%	100.00%
Operating Segments [Member] \| Technology Services [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 977	$ 1,144
Concentration Risk, Percentage	100.00%	100.00%