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Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Contracts Accounted for under Percentage of Completion [Member] Contracts Accounted for under Percentage of Completion [Member] Australia, Dollars Australia, Dollars Change in Contract with Customer, Liability [Abstract] Change in Contract with Customer, Liability [Abstract] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Insider Trading Arrangements [Line Items] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Accounting Changes and Error Correction [Abstract] Accounting Changes and Error Corrections [Abstract] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements 2022 Five Year Term 2022 Five Year Term [Domain] 2022 Five Year Term Accrual for Environmental Remediation Costs Accrual for Environmental Loss Contingencies Adjustment to Compensation, Amount Adjustment to Compensation Amount Components of net periodic benefit cost Schedule of Costs of Retirement Plans [Table Text Block] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Document Period End Date Document Period End Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Adoption Date Trading Arrangement Adoption Date Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Accumulated Depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Payments of long-term debt Repayments of Long-Term Debt Entity Central Index Key Entity Central Index Key Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Federal and foreign income tax expense Income Tax Expense (Benefit) Designated as Hedging Instrument [Member] Designated as Hedging Instrument [Member] Income Tax Authority [Domain] Income Tax Authority [Domain] Accrued employee compensation Employee-related Liabilities, Current FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Name Trading Arrangement, Individual Name Debt Instruments [Abstract] Debt Instruments [Abstract] Environmental Remediation [Table Text Block] Environmental Remediation [Table Text Block] Environmental Remediation Range of Possible Future Costs, Accrued Costs within that range and Deferred Cost expected to be recovered [Table Text Block] Equity [Abstract] Equity [Abstract] Minimum Loss Contingency Minimum Loss Contingency [Member] Minimum Loss Contingency Mission Systems [Member] Mission Systems [Member] Mission Systems reporting segment. Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash and Cash Equivalents, at Carrying Value US Government US Government [Member] US Government [Member] Credit Facility [Domain] Credit Facility [Domain] Shares Repurchased Stock Repurchased and Retired During Period, Shares Commercial Paper, Maximum Borrowing Capacity Commercial Paper, Maximum Borrowing Capacity Commercial Paper, Maximum Borrowing Capacity Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Long-term debt, net of current portion of $64 for 2023 and $1,072 for 2022 Long-Term Debt, Excluding Current Maturities Leasehold Improvements [Member] Leasehold Improvements [Member] Weighted-average diluted shares outstanding, in millions Weighted Average Number of Shares Outstanding, Diluted Change in Accounting Estimate [Line Items] Change in Accounting Estimate [Line Items] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Accelerated Share Repurchases, Date [Domain] Accelerated Share Repurchases, Date [Domain] Capital expenditures Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Paid-in capital Additional Paid in Capital, Common Stock Paid-in capital Additional Paid-in Capital [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Share Repurchase Program [Axis] Share Repurchase Program [Axis] Loss Contingencies Loss Contingencies [Line Items] Revision of Prior Period [Axis] Revision of Prior Period [Axis] Schedule of Change in Accounting Estimate [Table Text Block] Schedule of Change in Accounting Estimate [Table Text Block] Subsequent Events Subsequent Events [Text Block] United States UNITED STATES Fair Value, Recurring [Member] Fair Value, Recurring [Member] Segment Reconciling Items [Member] Segment Reconciling Items [Member] Other non-current liabilities Other Liabilities, Noncurrent Non-NEOs Non-NEOs [Member] Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Pension Benefits Pension Plan [Member] Total operating costs and expenses Operating Expenses SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Decrease in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Non-PEO NEO Non-PEO NEO [Member] Cost-type [Member] Time-and-Materials Contract [Member] Marketable Securities Marketable Securities Equity Component [Domain] Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Restricted Stock Rights and Restricted Performance Stock Rights Grant Date Aggregate Fair Value Restricted Stock Rights and Restricted Performance Stock Rights Grant Date Aggregate Fair Value Restricted Stock Rights and Restricted Performance Stock Rights Grant Date Aggregate Fair Value Pension and OPB contributions Payment for Pension and Other Postretirement Benefits Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Weighted-average common shares outstanding, in millions Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Fixed-price [Member] Fixed-Price Contract [Member] Operating income Operating income Operating Income (Loss) Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Segments [Axis] Segments [Axis] Statement [Line Items] Statement [Line Items] Income Tax Reconciliation Deductions FDII Effective Income Tax Rate Reconciliation, FDII, Amount Share Repurchases - Notes to Table Share Repurchases Table Abstract Share Repuchase Table Footnotes, detail tags Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Line of Credit Outstanding Long-Term Line of Credit