Retirement Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Benefits Pension Plan [Member] OPB Other Postretirement Benefits Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Components of Net Periodic Benefit Cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization of prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Net periodic benefit cost (benefit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Defined benefit plan, contributions by Employer Defined Benefit Plan, Plan Assets, Contributions by Employer Defined Contribution Plan [Abstract] Defined Contribution Plan [Abstract] Defined contribution plan, employer contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Fair Value, Recurring [Member] Fair Value, Recurring [Member] Fair Value, Nonrecurring [Member] Fair Value, Nonrecurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Marketable Securities Marketable Securities Derivatives Derivative Assets (Liabilities), at Fair Value, Net Commitments and Contingencies Disclosure [Abstract] Environmental Matters Environmental Remediation Obligations [Abstract] Environmental Contingency [Table] Site Contingency [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Current Liabilities [Member] Other Current Liabilities [Member] Other Noncurrent Liabilities [Member] Other Noncurrent Liabilities [Member] Other Current Assets [Member] Other Current Assets [Member] Other Noncurrent Assets [Member] Other Noncurrent Assets [Member] Site Contingency [Line Items] Site Contingency [Line Items] Accrual for Environmental Remediation Costs Accrual for Environmental Loss Contingencies Loss Contingency, Range of Possible Loss, Portion Not Accrued Loss Contingency, Range of Possible Loss, Portion Not Accrued Recorded Third-Party Environmental Recoveries, Amount Recorded Third-Party Environmental Recoveries, Amount Financial Arrangements Other Commitments [Abstract] Standby Unused Letters Of Credit and bank guarantees Standby Unused Letters Of Credit and bank guarantees Financial instruments issued by a bank, on behalf of the company and in favor of a beneficiary, which substitutes the company's credit worthiness with that of the bank. Letters of Credit are usually issued in conformance with a set of governing rules. Surety Bond Outstanding Surety Bond Outstanding Surety Bond Outstanding Line of Credit Facility Line of Credit Facility [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Commercial Paper [Member] Commercial Paper [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Two Year Term [Member] [Domain] Two Year Term [Member] [Domain] Two Year Term [Member] [Domain] Five Year Term [Member] [Domain] Five Year Term [Member] [Domain] Five Year Term [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Commercial Paper, Maximum Borrowing Capacity Commercial Paper, Maximum Borrowing Capacity Commercial Paper, Maximum Borrowing Capacity Commercial Paper Commercial Paper Commercial Paper, Weighted Average Interest Rate Short-term Debt, Weighted Average Interest Rate, at Point in Time Commercial Paper, Term Debt Instrument, Term Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Outstanding Long-term Line of Credit Line of Credit Facility, Interest Rate During Period Line of Credit Facility, Interest Rate During Period Debt Instrument, Covenant Compliance Debt Instrument, Covenant Compliance Share-based Payment Arrangement [Abstract] STOCK COMPENSATION PLANS AND OTHER COMPENSATION ARRANGEMENTS Share-based Payment Arrangement [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Equity [Abstract] Schedule of Share Repurchases, by Program [Table] Class of Treasury Stock [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] September 2015 Share Repurchase Program Original Authorization September 2015 Share Repurchase Original Authorization [Member] September 2015 Share Repurchase Original Authorization [Member] December 2018 Share Repurchase Original Authorization [Member] December 2018 Share Repurchase Original Authorization [Member] December 2018 Share Repurchase Original Authorization [Member] Share Repurchase [Line Items] Equity, Class of Treasury Stock [Line Items] Amount Authorized Stock Repurchase Program, Authorized Amount Shares Retired Treasury Stock, Shares, Retired Average Cost Per Share Treasury Stock Acquired, Average Cost Per Share Shares Repurchased Stock Repurchased and Retired During Period, Shares Share Repurchases - Notes to Table Share Repurchases Table Abstract Share Repuchase Table Footnotes, detail tags Shares repurchased amount Treasury Stock, Value, Acquired, Par Value Method Amount remaining under authorization for share repurchases Stock Repurchase Program, Remaining Authorized Repurchase Amount Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net EARNINGS PER SHARE, SHARE REPURCHASES AND DIVIDENDS ON COMMON STOCK Stockholders' Equity Note Disclosure [Text Block] Income Tax Disclosure [Abstract] Schedule of Income Tax Expense and Effective Income Tax Rates Schedule of Income Tax Expense and Effective Income Tax Rates [Table Text Block] Schedule of Income Tax Expense and Effective Income Tax Rates [Table Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] Statement [Line Items] Statement [Line Items] Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net earnings Net Income (Loss) Attributable to Parent Adjustments to reconcile to net cash used in operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation Share-based Payment Arrangement, Noncash Expense Deferred income taxes Deferred Income Taxes and Tax Credits Changes in assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] Accounts receivable, net Increase (Decrease) in Accounts Receivable Unbilled receivables, net Increase (Decrease) in Contract with Customer, Asset Inventoried costs, net Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Income taxes payable, net Increase (Decrease) in Income Taxes Payable Retiree benefits Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Other, net Other Noncash Income (Expense) Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Other, net Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Net proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt Payments to credit facilities Repayments of Lines of Credit Net borrowings on commercial paper Proceeds from (Repayments of) Commercial Paper Common stock repurchases Payments for Repurchase of Common Stock Cash dividends paid Payments of Ordinary Dividends, Common Stock Payments of employee taxes withheld from share-based awards Payment, Tax Withholding, Share-based Payment Arrangement Other, net Proceeds from (Payments for) Other Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents, beginning of year Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Debt Disclosure [Abstract] Long-term Debt, Fair Value Long-term Debt, Fair Value Debt and Lease Obligation Debt and Lease Obligation Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Two Thousand Thirty [Member] Two Thousand Thirty [Member] 2030 Note Two Thousand Forty 2 [Member] Two Thousand Forty 2 [Member] Second 2040 Note Two Thousand Fifty [Member] Two Thousand Fifty [Member] 2050 Note Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instrument, Face Amount Debt Instrument, Face Amount Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Nonvested Restricted Stock Shares Activity [Table Text Block] Schedule of Nonvested Share Activity [Table Text Block] Cash Units and Cash Performance Units Aggregate Payout Amount [Table Text Block] Cash Units and Cash Performance Units Aggregate Payout Amount [Table Text Block] [Table Text Block] for Cash Units and Cash Performance Units Aggregate Payout Amount [Table] Segment Reporting [Abstract] Sales and operating income by segment Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Revenue by Major Customers by Reporting Segments Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Revenue from External Customers by Contract Type Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Statement of Comprehensive Income [Abstract] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Product [Member] Product [Member] Service [Member] Service [Member] Sales Revenues Cost of Sales Cost of Goods and Services Sold Operating costs and expenses Cost of Goods and Services Sold [Abstract] General and administrative expenses General and Administrative Expense Operating income Operating Income (Loss) Other (expense) income Other Nonoperating Income (Expense) [Abstract] Interest expense Interest and Debt Expense FAS (non-service) pension benefit Net FAS (non-service) Pension Benefit (Expense) Net FAS (non-service) Pension Benefit (Expense) Other, net Other Nonoperating Income (Expense) Earnings before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Federal and foreign income tax expense Income Tax Expense (Benefit) Net earnings Basic earnings per share Earnings Per Share, Basic [Abstract] Basic earnings per share Earnings Per Share, Basic Weighted-average common shares outstanding, in millions Weighted Average Number of Shares Outstanding, Basic Diluted earnings per share Earnings Per Share, Diluted [Abstract] Diluted earnings per share Earnings Per Share, Diluted Weighted-average diluted shares outstanding, in millions Weighted Average Number of Shares Outstanding, Diluted Net earnings (from above) Change in unamortized prior service credit, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Change in cumulative translation adjustment and other, net Other Comprehensive Income (Loss), Foreign Currency Translation and Translation Adjustment and Other, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Translation and Translation Adjustment and Other, Net of Tax Other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common stock Common Stock [Member] Paid-in capital Additional Paid-in Capital [Member] Retained earnings Retained Earnings [Member] Accumulated other comprehensive (loss) income AOCI Attributable to Parent [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning of period Stockholders' Equity Attributable to Parent Common stock repurchased Stock Repurchased and Retired During Period, Value Dividends declared Dividends, Common Stock Stock compensation Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Other Stockholders' Equity, Other Other comprehensive loss, net of tax End of period Cash dividends declared per share Common Stock, Dividends, Per Share, Declared Share Repurchases Class of Treasury Stock [Table Text Block] Statement of Financial Position [Abstract] Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Long-term debt, current portion Long-term Debt, Current Maturities Preferred Stock, par value Preferred Stock, Par or Stated Value Per Share Preferred Stock, shares authorized Preferred Stock, Shares Authorized Preferred Stock, shares issued Preferred Stock, Shares Issued Preferred Stock, shares outstanding Preferred Stock, Shares Outstanding Common Stock, par value Common Stock, Par or Stated Value Per Share Common Stock, shares authorized Common Stock, Shares Authorized Common Stock, shares issued Common Stock, Shares, Issued Common Stock, shares outstanding Common Stock, Shares, Outstanding Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Operating Segments [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States UNITED STATES Asia/Pacific Asia Pacific [Member] All other All Other - Geographic Region [Domain] All Other - Geographic Region [Domain] Intersegment sales Intersegment Sales [Member] Intersegment Sales [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Aeronautics Systems [Member] Aeronautics Systems [Member] Aeronautics Systems reporting segment. Defense Systems [Member] Defense Systems [Member] Defense Systems reporting segment. Mission Systems [Member] Mission Systems [Member] Mission Systems reporting segment. Space Systems [Member] Space Systems [Member] Space Systems reporting segment. Revenue, Geographic Location [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Concentration Risk, Percentage Concentration Risk, Percentage Components of net periodic benefit cost Schedule of Costs of Retirement Plans [Table Text Block] Employer contributions to retirement plans Schedule of Defined Benefit Plans Disclosures [Table Text Block] Assets Assets [Abstract] Cash and cash equivalents Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Unbilled receivables, net Contract with Customer, Asset, Net, Current Inventoried costs, net Inventory, Net Prepaid expenses and other current assets Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net of accumulated depreciation of $5,952 for 2020 and $5,850 for 2019 Property, Plant and Equipment, Net Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Goodwill Goodwill Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Deferred tax assets Deferred Income Tax Assets, Net Other non-current assets Other Assets, Noncurrent Total assets Assets Liabilities Liabilities [Abstract] Trade accounts payable Accounts Payable, Current Accrued employee compensation Employee-related Liabilities, Current Advance payments and billings in excess of costs incurred Contract with Customer, Liability, Current Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Long-term debt, net of current portion of $1,790 for 2020 and $1,109 for 2019 Long-term Debt, Excluding Current Maturities Pension and other postretirement benefit plan liabilities Liability, Defined Benefit Plan, Noncurrent Operating lease liabilities Operating Lease, Liability, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 6) Commitments and Contingencies Shareholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $1 par value; 10,000,000 shares authorized; no shares issued and outstanding Preferred Stock, Value, Issued Common stock, $1 par value; 800,000,000 shares authorized; issued and outstanding: 2020—167,099,297 and 2019—167,848,424 Common Stock, Value, Issued Paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders’ equity Total liabilities and shareholders’ equity Liabilities and Equity Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount Disclosure Text Block Supplement [Abstract] INVESTIGATIONS, CLAIMS AND LITIGATION Legal Matters and Contingencies [Text Block] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] U.S. government(1) US Government [Member] US Government [Member] International(2) International [Member] International [Member] Other customers Other Customers [Member] US state and local government and US commercial customers. Intersegment Sales [Member] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Loss Contingencies [Table] Loss Contingencies [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Maximum Maximum [Member] Claim Amount [Axis] Claim Amount [Axis] Claim Amount [Axis] - Defines movements in claim amounts from litigation matters. Claim Amount [Domain] Claim Amount [Domain] [Domain] for Claim Amount [Axis] - Defines movements in claim amounts from litigation matters. Initial Claim [Member] Initial Claim [Member] Initial Claim [Member] - Amount of initial claim in a litigation matter. Incremental claim [Member] Incremental claim [Member] Incremental claim [Member] - Incremental claim related to a litigation matter. Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] United States Postal Service United States Postal Service [Member] United States Postal Service [Member] Solystic Matter [Member] Solystic Matter [Member] Solystic Matter [Member] Gain Contingencies by Nature [Axis] Gain Contingencies, Nature [Axis] Gain Contingency, Nature [Domain] Gain Contingency, Nature [Domain] Unpaid Portions of Contract Price and Direct Costs Incurred [Member] Unpaid Portions of Contract Price and Direct Costs Incurred [Member] Unpaid Portions of Contract Price and Direct Costs Incurred [Member] Acts and Omissions with Adverse Affects on Performance and Obligations [Member] Acts and Omissions with Adverse Affects on Performance and Obligations [Member] Acts and Omissions with Adverse Affects on Performance and Obligations [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] False Claims Act False Claims Act [Member] False Claims Act [Member] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Threatened Litigation Threatened Litigation [Member] Loss Contingencies Loss Contingencies [Line Items] Contract award Contract Award Total Contract Award Unbilled receivables, net Unbilled Receivables, Current Gain contingency, unrecorded amount Gain Contingency, Unrecorded Amount Loss Contingency, Estimate of Possible Loss Loss Contingency, Estimate of Possible Loss Loss Contingency, Damages Sought, Value Loss Contingency, Damages Sought, Value CounterclaimForDamagesSought CounterclaimForDamagesSought CounterclaimForDamagesSought Counterclaim Counterclaim Counterclaim for damages sought Loss Contingency, Damages Awarded, Value Loss Contingency, Damages Awarded, Value Loss Contingency, Number of Additional Defendants Loss Contingency, Number of Defendants Schedule of Change in Accounting Estimate [Table Text Block] Schedule of Change in Accounting Estimate [Table Text Block] Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Fiscal Period Policy Fiscal Period, Policy [Policy Text Block] Accounting Estimates Use of Estimates, Policy [Policy Text Block] Revenue from Contract with Customer Revenue from Contract with Customer [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Investments in Marketable Securities Marketable Securities, Policy [Policy Text Block] Derivative Financial Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Fair Value of Long-term Debt Fair Value of Financial Instruments, Policy [Policy Text Block] U.S. Government Cost Claims Government Cost Claims [Policy Text Block] Government Cost Claims and Contingencies as it relates to government contracting Pension and Other Postretirement Plans Pension and Other Postretirement Plans, Policy [Policy Text Block] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Unamortized prior service credit, net of tax expense of $13 for 2020 and $17 for 2019 Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Cumulative translation adjustment and other, net Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Total accumulated other comprehensive loss Unamortized prior service credit, tax expense Prior Service Cost Tax Expense Prior Service Cost Tax Expense FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] INCOME TAXES Income Tax Disclosure [Text Block] Change in Contract with Customer, Liability [Abstract] Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Revenue from Contract with Customer [Abstract] Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation Environmental Remediation Range of Future Costs [Table] Environmental Remediation Range of Future Costs [Table] Environmental Remediation Range of Future Costs, the amount accrued within the rang and the deferred costs expected to be recoverable through overhead charges on US Government contracts [Table] Environmental Remediation Range of Future Costs [Line Items] Environmental Remediation Range of Future Costs [Line Items] [Line Items] for Environmental Remediation Range of Future Costs, the amount accrued within the range and the deferred costs expected to be recoverable through overhead charges on US Government contracts [Table] 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] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Common stock dividends per share, declared (in dollars per share) Increase in quarterly common stock dividend (percent) Increase (Decrease) in Stock Dividend, Percentage Increase (Decrease) in Stock Dividend, Percentage Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Performance Shares [Member] Performance Shares [Member] Cash Units and Cash Performance Units Cash Units and Cash Performance Units [Member] Cash Units and Cash Performance Units [Member] Cash Units Cash Units [Member] Cash Units [Member] Cash Performance Units Cash Performance Units [Member] Cash performance units. Minimum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 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 Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Intersegment sales Intersegment Eliminations [Member] Segment Reconciling Items [Member] Segment Reconciling Items [Member] Corporate, Non-Segment [Member] Corporate, Non-Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of reportable segments Number of Reportable Segments Net FAS (service)/ CAS pension adjustment Net FAS (service)/ CAS pension adjustment Net FAS (service)/ CAS pension adjustment Accounting Changes and Error Correction [Abstract] Accounting Changes and Error Corrections [Abstract] Schedule of Change in Accounting Estimate [Table] Schedule of Change in Accounting Estimate [Table] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Contracts Accounted for under Percentage of Completion [Member] Contracts Accounted for under Percentage of Completion [Member] Change in Accounting Estimate [Line Items] Change in Accounting Estimate [Line Items] Revenue Contract with Customer, Performance Obligation Satisfied in Previous Period Operating income Decrease in Unrecognized Tax Benefits is Reasonably Possible Decrease in Unrecognized Tax Benefits is Reasonably Possible Document and Entity Information [Abstract] Document and Entity Information. Entity Current Reporting Status Entity Current Reporting Status Document Type Document Type Document Fiscal Period Focus Document Fiscal Period Focus Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Line 1 Entity Address, Address Line One Entity Address, City Or Town Entity Address, City or Town Entity Address, State Or Province Entity Address, State or Province Entity Address, Postal ZIP Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair value information of assets and liabilities measured at fair value on a recurring basis Fair Value, by Balance Sheet Grouping [Table Text Block] SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Cost-type [Member] Time-and-materials Contract [Member] Fixed-price [Member] Fixed-price Contract [Member] Revenue, Contract Type [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] RETIREMENT BENEFITS Pension and Other Postretirement Benefits Disclosure [Text Block]