Statement of Cash Flows [Abstract] Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net earnings Net Income (Loss) Attributable to Parent Adjustments to reconcile net earnings to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation and Amortization Including Discontinued Operations Depreciation and Amortization Including Discontinued Operations Stock-based compensation Share-based Payment Arrangement, Noncash Expense Deferred income taxes Deferred Income Tax Expense (Benefit) Severance and restructuring charges Restructuring Charges Gain on property sale Gain (Loss) on Sale of Properties Gain on divestiture of IS&GS business Gain (Loss) on Disposition of Business Changes in assets and liabilities Increase (Decrease) in Operating Capital [Abstract] Receivables, net Increase (Decrease) in Receivables Contract assets Increase (Decrease) in Contract with Customer, Asset Inventories Increase (Decrease) in Inventories Accounts payable Increase (Decrease) in Accounts Payable Contract liabilities Increase (Decrease) in Contract with Customer, Liability Postretirement benefit plans Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Income taxes Increase (Decrease) in Income Taxes Payable Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by 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 Productive Assets Other, net Payments for (Proceeds from) Other Investing Activities Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Repurchases of common stock Payments for Repurchase of Common Stock Dividends paid Payments of Ordinary Dividends, Common Stock Proceeds from issuance of commercial paper, net Proceeds from (Repayments of) Commercial Paper Repayments of long-term debt Repayments of Long-term Debt Other, net Proceeds from (Payments for) Other Financing Activities Net cash used for financing activities Net Cash Provided by (Used in) Financing Activities Net change 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 at beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents at end of year Revenue from Contract with Customer [Abstract] Receivables, net Receivables, Net, Current Contract assets Contract with Customer, Asset, Net, Current Contract liabilities Contract with Customer, Liability, Current Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Inventory Disclosure [Abstract] Capitalized contract cost Capitalized Contract Cost, Net Materials, spares and supplies Inventory, Raw Materials and Supplies, Gross Work-in-process Inventory, Work in Process, Gross Finished goods Inventory, Finished Goods, Gross Total inventories Inventory, Net Accounting Policies [Abstract] Significant Accounting Policies Significant Accounting Policies [Text Block] Quarterly Financial Information Disclosure [Abstract] Summary of Quarterly Information (Unaudited) Quarterly Financial Information [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment, net Property, Plant and Equipment Disclosure [Text Block] Statement of Financial Position [Abstract] Common stock, par value (in USD per share) Common Stock, Par or Stated Value Per Share Long-term Debt Schedule of Debt [Table Text Block] Schedule of Receivables, Net, Contract Assets and Contract Liabilities Contract with Customer, Asset and Liability [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Sikorsky Aircraft Corporation Sikorsky Aircraft Corporation [Member] Sikorsky Aircraft Corporation [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Customer contractual obligations acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Customer Contractual Obligations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Customer Contractual Obligations Sales related to customer contractual obligations to date Sales Related To Customer Contractual Obligations, To Date Sales related to Customer Contractual obligations, to date Contractual obligation, due in next fiscal year Contractual Obligation, Due in Next Fiscal Year Contractual obligation, due in second year Contractual Obligation, Due in Second Year Contractual obligation, due in third year Contractual Obligation, Due in Third Year Contractual obligation, due in fourth year Contractual Obligation, Due in Fourth Year Contractual obligation, due in fifth year Contractual Obligation, Due in Fifth Year Contractual obligation, due thereafter Contractual Obligation, Due after Fifth Year Equity [Abstract] Shareholders Equity [Table] Shareholders Equity [Table] Shareholders Equity [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Retained Earnings Retained Earnings [Member] Shareholders Equity [Line Items] Shareholders Equity [Line Items] Shareholders Equity [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Common stock, shares issued and outstanding (in shares) Common Stock, Shares, Issued Common stock, $1 par value per share Common Stock, Value, Outstanding Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Number of shares of common stock repurchased with cash (in shares) Common Stock Repurchased With Cash During Period Shares Number of shares of common stock that have been repurchased with cash during the period. Reduction to stockholder's equity due to repurchases of common stock Stock Repurchased During Period, Value Cash paid for repurchases of common stock Accelerate Share Repurchase (ASR) authorized amount Stock Repurchase Program, Authorized Amount Shares received (in shares) Treasury Stock, Common, Shares Average Price Paid Per Share Treasury Stock Acquired, Average Cost Per Share Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Additional share repurchase program authorized amount Share Repurchase Program Additional Authorized Amount Increase to the authorized amount of the Company's share repurchase program by the Board of Directors. Remaining authorized repurchase amount under share repurchase program Stock Repurchase Program, Remaining Authorized Repurchase Amount Additional paid-in capital Additional Paid in Capital, Common Stock Dividends paid Common stock dividends per share paid (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Fair Value Disclosures [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Recurring [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] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] NAV Fair Value Measured at Net Asset Value Per Share [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Mutual funds Equity Funds [Member] U.S. Government securities US Government Agencies Debt Securities [Member] Other securities Other securities [Member] Other securities [Member] Other commingled funds Other Commingled Funds [Member] Other commingled funds [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Fair value of investments measured on recurring basis Investments, Fair Value Disclosure Derivatives Derivative Asset Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Derivatives Derivative Liability Assets measured at NAV Alternative Investment Share-based Payment Arrangement [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segment Reconciling Items Segment Reconciling Items [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Stock Option Share-based Payment Arrangement, Option [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Performance Stock Units (PSUs) Performance Shares [Member] Share Based Compensation Arrangement By Share Based Payment Award Compensation Plans [Axis] Share Based Compensation Arrangement By Share Based Payment Award Compensation Plans [Axis] Share Based Compensation Arrangement By Share Based Payment Award Compensation Plans [Axis] Share Based Compensation Arrangement By Share Based Payment Award Compensation Plans [Domain] Share Based Compensation Arrangement By Share Based Payment Award Compensation Plans [Domain] Share Based Compensation Arrangement By Share Based Payment Award Compensation Plans [Domain] Half Of PSUs Granted In Period Half Of PSUs Granted In Period [Member] Half Of PSUs Granted In Period [Member] Remaining Half Of PSUs Granted In Period Remaining Half Of PSUs Granted In Period [Member] Remaining Half Of PSUs Granted In Period [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock-based compensation Share-based Payment Arrangement, Expense Share-based compensation, net of tax Share-based Payment Arrangement, Expense, after Tax Unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Period over which unrecognized compensation costs are expected to be recognized (years) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not Yet Recognized, Remaining Period For Recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Remaining Period for Recognition Cash received from exercise of stock options Proceeds from Stock Options Exercised Realized tax benefits from stock-based compensation activities Share-based Payment Arrangement, Exercise of Option, Tax Benefit Weighted average remaining contractual life, vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Number of years over which equity awards expire Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Number of shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Shares reserved for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Number of stock, granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Average grant date fair value per unit (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Number of years over which equity awards vest Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Number of stock options, outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Weighted average exercise price, outstanding (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average remaining contractual life, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Aggregate intrinsic value, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Number of stock options, vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted average exercise price, vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Intrinsic value of all stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Range of shares that can be earned from stock awards, as a percentage of the target award Share-Based Compensation Arrangement by Share-Based Payment Award, Conversion Rate of Target Award The range of the number of shares that can be earned from target awards, as a percentage of the target award. Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land Land [Member] Buildings Building [Member] Machinery and equipment Machinery and Equipment [Member] Construction in progress Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Total property, plant and equipment Property, Plant and Equipment, Gross Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total property, plant and equipment, net Property, Plant and Equipment, Net Organization Organization [Policy Text Block] Disclosure of accounting policy for organization of company. Basis of presentation Consolidation, Policy [Policy Text Block] Use of estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition, Contract assets and Contract liabilities Revenue from Contract with Customer [Policy Text Block] Research and development and similar costs Research and Development Expense, Policy [Policy Text Block] Stock-based compensation Share-based Payment Arrangement [Policy Text Block] Income taxes Income Tax, Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Receivables Receivable [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Property, plant and equipment Property, Plant and Equipment, Policy [Policy Text Block] Capitalized software Internal Use Software, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Intangible assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Postretirement benefit plans Pension and Other Postretirement Plans, Policy [Policy Text Block] Environmental matters Environmental Costs, Policy [Policy Text Block] Investments in marketable securities Investment, Policy [Policy Text Block] Equity method investments Equity Method Investments [Policy Text Block] Derivative financial instruments Derivatives, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Earnings per share computation Earnings Per Share, Policy [Policy Text Block] Acquired finite lived intangible assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Inventories, costs to fulfill a contract Inventory Costs for Contracts or Programs, Policy [Policy Text Block] Retirement Benefits [Abstract] Contributions made to defined contribution plans Defined Contribution Plan, Cost Shares of our stock held in defined contribution plans we sponsor (in shares) Shares Of Our Stock Held In Defined Contribution Plans We Sponsor Shares of our stock held in defined contribution plans we sponsor. Leases [Abstract] Total Lessee, Operating Lease, Liability, Payments, Due 2020 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total Operating Lease, Liability Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, remaining performance obligation, percentage Revenue, Remaining Performance Obligation, Percentage Expected time of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Operations Consolidation [Member] Operations Consolidation [Member] Operations Consolidation [Member] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] AMMROC Advanced Military Maintenance, Repair and Overhaul Center [Member] Advanced Military Maintenance, Repair and Overhaul Center [Member] Project [Axis] Project [Axis] Project [Domain] Project [Domain] EADGE-T EADGE-T [Member] EADGE-T [Member] LM2100 LM 2100 Project [Member] LM 2100 Project [Member] Warrior Capability Sustainment Program Warrior Capability Sustainment Program [Member] Warrior Capability Sustainment Program [Member] Capitalized Software Software and Software Development Costs [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] RMS Rotary and Mission Systems [Member] Rotary and Mission Systems [Member] Space Space Systems [Member] Space Systems [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as hedges Designated as Hedging Instrument [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate swaps Interest Rate Swap [Member] Foreign currency contracts Foreign Exchange Contract [Member] 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 Contracts Accounted for under Percentage of Completion [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer programs Customer Contracts [Member] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Number of contract types Revenue From Contract With Customer, Number Of Contract Types Revenue from Contract with Customer, Number Of Contract Types Ending backlog Revenue, Remaining Performance Obligation, Amount Increase in operating profit due to profit rate adjustments Increase Decrease In Operating Income (Loss) Increase (decrease) in operating profit due to favorable/unfavorable profit rate adjustments. Increase in net earnings due to profit rate adjustments Increase (Decrease) In Net Income Loss Increase (decrease) in net earnings due to favorable/unfavorable profit rate adjustments. Increase in diluted earnings per common share due to profit rate (in dollars per share) Increase Decrease In Net Income Loss Per Share Diluted Increase (decrease) in diluted earnings per share due to favorable/unfavorable profit rate adjustments. Performance obligation satisfied in previous period Contract with Customer, Performance Obligation Satisfied in Previous Period Severance and restructuring charges, net of tax Restructuring Charges, Net Of Tax Restructuring Charges, Net Of Tax Severance and restructuring charges (in dollars per share) Restructuring Charges, Per Share Restructuring Charges, Per Share Contract loss incurred, gross Contract Loss Incurred, Gross Aggregate cost incurred and charged to cost of sales for performance matters on a contract Contract loss incurred, after tax Contract Loss Incurred, After-Tax Aggregate cost incurred and charged to cost of sales for performance matters on a contract, after-tax impact Contract loss incurred, after tax (in dollars per share) Contract Loss Incurred, Earnings Per Share Aggregate cost incurred and charged to cost of sales for performance matters on a contract, after-tax impact, earnings per share impact. Number of commercial satellite programs with performance issues Number Of Commercial Satellite Programs With Performance Issues Number Of Commercial Satellite Programs With Performance Issues Commercial satellite cumulative losses on development Estimated Cumulative Losses Estimated cumulative losses, including reserves, recorded since inception. Independent research and development costs charged to cost of sales Research and Development Expense Weighted average remaining contractual life, vested Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Financing receivable, significant sales Financing Receivable, Sale Gain (loss) on sale of accounts receivable Gain (Loss) on Sale of Accounts Receivable Property, plant and equipment, estimated life Property, Plant and Equipment, Useful Life Depreciation Depreciation Capitalized internal-use software, net Capitalized Internal Use Software Net Certain costs capitalized associated with the development or purchase of internal-use software net of accumulated amortization. Capitalized internal-use software accumulated amortization Capitalized Internal Use Software Accumulated Amortization Accumulated amortization of capitalized internal-use software. Capitalized internal-use software amortization Amortization Goodwill Goodwill Acquired finite-lived intangible assets are amortized Finite-Lived Intangible Assets, Remaining Amortization Period Time period environmental costs and recovery of environmental costs are projected over Time Period Environmental Costs and Recovery of Environmental Costs Are Projected Over Time period environmental costs and recovery of environmental costs are projected over. Fair value of trading securities Debt Securities, Trading, and Equity Securities, FV-NI Net gains (losses) on marketable securities Marketable Securities, Gain (Loss) Total equity method investments Equity Method Investments Net earnings from equity method investments Income (Loss) from Equity Method Investments Equity method investee impairment Equity Method Investment, Other than Temporary Impairment Equity method investee impairment, net of tax Equity Method Investment Other than Temporary Impairment Net Of Tax Equity method investment other than temporary impairment net of tax. Equity method investee impairment (in dollars per share) Equity Method Investment Other Than Temporary Impairment Earnings Per Share Equity method investment other than temporary impairment earnings per share. Aggregate notional amount of derivatives Derivative, Notional Amount Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposed of by Sale Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Distributed Energy Solutions Distributed Energy Solutions [Member] Distributed Energy Solutions [Member] Aeronautics Aeronautics [Member] Aeronautics [Member] Missiles and Fire Control Missiles And Fire Control [Member] Missiles And Fire Control [Member] Rotary and Mission Systems Space Space [Member] Space [Member] Operating Segments Operating Segments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Net sales Segment Reporting Information, Revenue for Reportable Segment [Abstract] Net sales Revenues Operating profit Segment Reporting Information, Operating Income (Loss) [Abstract] Operating profit Operating Income (Loss) Unallocated items Unallocated Items [Abstract] Unallocated Items [Abstract] FAS/CAS operating adjustment Fas Cas Operating Adjustment The difference between the service cost component of U.S. GAAP FAS pension expense and total pension costs recoverable on U.S. Government contracts as determined in accordance with U.S. Government cost accounting standards Other, net Other Unallocated Expenses, Net The amount of other unallocated expenses, net. Total unallocated, net Unallocated Net Total amount of unallocated items, net. Gain on property sale Net gain on divestiture of business segment Schedule Of Net Periodic Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status Schedule of Defined Benefit Plans Disclosures [Table Text Block] Amounts Recognized on Balance Sheets Related to Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plans Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Amounts Recognized in Other Comprehensive Income (Loss) Related to Postretirement Benefit Plans, Net of Tax Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Actuarial Assumptions Used to Determine Net Periodic Benefit Cost Defined Benefit Plan, Assumptions [Table Text Block] Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Estimated Future Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Customer relationships Customer Relationships [Member] Other Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-Lived, Gross Carrying Amount Finite-Lived Intangible Assets, Gross Indefinite-Lived, Carrying Amount Indefinite-lived Intangible Assets (Excluding Goodwill) Finite-Lived, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Total acquired intangibles Intangible Assets, Gross (Excluding Goodwill) Finite-Lived, Net Carrying Amount Finite-Lived Intangible Assets, Net Total acquired intangibles, Net Carrying Amount Intangible Assets, Net (Excluding Goodwill) Quarterly Financial Information [Table] Quarterly Financial Information [Table] Quarterly Financial Information [Table] Quarterly Financial Information [Line Items] Quarterly Financial Information [Line Items] Quarterly Financial Information [Line Items] Gain on property sale, after tax Gain (Loss) On Sale Of Properties, After Tax Gain (Loss) on Sale of Properties, After Tax Gain on property sale per share, after tax (in dollars per share) Gain (Loss) On Sale Of Properties, After Tax Per Share Amount Gain (Loss) on Sale of Properties, After Tax Per Share Amount Foreign derived intangible income deduction related to prior year Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount Foreign derived intangible income deduction related to prior year (in dollars per share) Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Per Share Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Per Share Income Tax Disclosure [Abstract] Deferred tax asset, write off Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) Remeasurement of deferred tax asset Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit) Effect of change on earnings per share (in dollars per share) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit), Effect On Earnings Per Share Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit), Effect On Earnings Per Share Total net state income tax expense State and Local Income Tax Expense (Benefit), Continuing Operations Foreign derived intangible income deduction Effective Income Tax Rate Reconciliation, Deduction, Foreign Derived Intangible Income Effective Income Tax Rate Reconciliation, Deduction, Foreign Derived Intangible Income Foreign derived intangible income deduction related to prior year Deduction for foreign derived intangible income enacted by the Tax Act, current and prior year Effective Income Tax Rate Reconciliation, Deduction, Foreign Derived Intangible Income, Prior And Current Years Effective Income Tax Rate Reconciliation, Deduction, Foreign Derived Intangible Income, Prior And Current Years Recognized tax benefit Effective Income Tax Rate Reconciliation, Change in Tax Accounting Method, Amount Effective Income Tax Rate Reconciliation, Change in Tax Accounting Method, Amount Unrecognized tax benefits Unrecognized Tax Benefits Federal and foreign income tax payments made, net of refunds received Income Taxes Paid, Net Estimated fair values of debt instruments Long-term Debt, Fair Value Outstanding principal amount of debt instruments Long-term Debt, Gross Unamortized discounts and issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Leidos Holdings, Inc. Leidos Holdings, Inc. [Member] Leidos Holdings, Inc. [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] N.Y. Metropolitan Transportation Authority New York Metropolitan Transportation Authority [Member] New York Metropolitan Transportation Authority [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of pending lawsuits Loss Contingency, Pending Claims, Number Number of entities involved in litigation Number Of Entities Involved In Litigation Number Of Entities Involved In Litigation Damages sought by plaintiff Loss Contingency, Damages Sought, Value Reserve transferred Litigation Reserve, Transferred As Part Of Divestiture Litigation Reserve, Transferred As Part Of Divestiture Indemnification percent, up to maximum reserve Litigation Settlement, Indemnification Of Liabilities Assumed, Percentage In Excess Of Reserve Litigation Settlement, Indemnification Of Liabilities Assumed, Percentage In Excess Of Reserve Maximum reserve Litigation Settlement, Maximum Reserve Litigation Settlement, Maximum Reserve Indemnification percent, in excess of maximum reserve Litigation Settlement, Indemnification Of Liabilities Assumed, Percentage In Excess Of Maximum Reserve Litigation Settlement, Indemnification Of Liabilities Assumed, Percentage In Excess Of Maximum Reserve Contract value Contract Value Total contract value. Contract payments received to date Contract Payments Received To Date Contract payments received to date. Claims for monetary damages against the plaintiff Counterclaim For Damages Sought Counterclaim for damages sought for the current period. Period of bench trial Loss Contingency, Period Of Bench Trial Loss Contingency, Period Of Bench Trial Liabilities recorded relative to environmental matters Accrual for Environmental Loss Contingencies Environmental costs eligible for future recovery Recorded Third-Party Environmental Recoveries Receivable Outstanding letters of credit, surety bonds, and third-party guarantees Letters of Credit Surety Bonds and Third Party Guarantees The aggregate total amount of outstanding letters of credit, surety bonds, and third-party guarantees. Third-party guarantees outstanding Guarantor Obligations, Maximum Exposure, Undiscounted Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures Percentage Of Guarantees That Relate To Guarantees Of Contractual Performance Of Joint Ventures Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures to which we currently are or previously were a party. Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Provision for Federal & Foreign Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Reconciliation of Income Tax Expense Computed Using U.S. Statutory Federal Tax Rate to Actual Income Tax Expense Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Components of Federal and Foreign Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Domain] Retirement Plan Name [Domain] Irrevocable Group Annuity Contract Irrevocable Group Annuity Contract [Member] Irrevocable Group Annuity Contract [Member] Buy-In Contract Buy-In Contract [Member] Buy-In Contract [Member] Financial Instrument [Axis] Financial Instrument [Axis] Investments [Domain] Financial Instruments [Domain] Commingled equity funds Commingled Equity Funds [Member] Commingled Equity Funds [Member] Private equity funds Private Equity Funds [Member] Real estate funds Real Estate [Member] Hedge funds Hedge Funds [Member] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Qualified Defined Benefit Pension Plans Pension Plan [Member] Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Domain] Retirement Plan Tax Status [Domain] Nonqualified Plan Nonqualified Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Number of insurance contracts purchased Defined Benefit Plan, Number Of Purchased Insurance Company Contract Covering Outstanding Defined benefit Pension Obligations Defined Benefit Plan, Number Of Purchased Insurance Company Contract Covering Outstanding Defined benefit Pension Obligations Cash payment for contract Defined Benefit Plan, Plan Assets, Cash Payment For Contract Defined Benefit Plan, Plan Assets, Cash Payment Number of retirees Defined Benefit Plan, Number Of Employees Defined Benefit Plan, Number Of Employees Reimbursable future benefit payments Defined Benefit Plan, Plan Assets, Reimbursable Future Benefit Payments Defined Benefit Plan, Plan Assets, Reimbursable Future Benefit Payments Difference between insurance payment and pension obligations funded recognized in other comprehensive loss Other Comprehensive Income (Loss), Difference Between Insurance Payment And Pension Obligations Funded Other Comprehensive Income (Loss), Difference Between Insurance Payment And Pension Obligations Funded Accumulated benefit obligation for defined benefit pension plans Defined Benefit Plan, Accumulated Benefit Obligation Defined benefit pension plan, liabilities Liability, Defined Benefit Pension Plan Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans Defined Benefit Plan, Plan Assets, Amount Unrecognized net actuarial losses Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Unrecognized prior service credit Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax Benefit plan expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Aggregate liability for postemployment plans Postemployment Benefits Liability Actuarial losses and net prior service cost related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2020 Defined Benefit Plan, Expected Amortization, Next Fiscal Year Actuarial losses and net prior service cost related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2020, net of tax Defined Benefit Plan Amount To Be Amortized From Accumulated Other Comprehensive Income Loss Next Fiscal Year Net Of Tax Amount included in accumulated other comprehensive income (AOCI) net of tax expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). Actuarial losses related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2020 Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year Actuarial losses related to postretirement benefit plans expected to be recognized in net periodic benefit cost during 2020, net of tax Defined Benefit Plan Amortization Of Net Gains Losses Net Of Tax The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented, net of tax. Expected pension plan expenses during next fiscal year Qualified Defined Benefit Plan Net Periodic Benefit Cost Expected In Next Fiscal Year The total expected amount of net periodic benefit cost related to qualified defined benefit plans for the next fiscal year. Increase (decrease) in projected benefit obligations due to a change in discount rate Change In Projected Benefit Obligations Due To Change In Discount Rate Increase (decrease) in projected benefit obligations due to change in discount rate. Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period Company contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Changes in longevity assumptions Defined Benefit Plan, Actuarial Loss Related to Change in Longevity Assumption Amount of increase in benefit obligation resulting from a change in the longevity (also known as mortality) assumption. Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Actual return on plan assets (percent) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Actual Return on Plan Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Actual Return on Plan Assets Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Expected long-term rate of return on assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Summary of Stock Based Compensation Activity Related to Nonvested RSUs Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] Amortization expense for acquired finite lived intangible assets Amortization of Intangible Assets Amortization of finite lived intangible assets in 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Amortization of finite lived intangible assets in 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two Amortization of finite lived intangible assets in 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three Amortization of finite lived intangible assets in 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four Amortization of finite lived intangible assets in 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Amortization of finite lived intangible assets after 2024 Finite-Lived Intangible Assets, Amortization Expense, after Year Five Deferred tax assets related to: Deferred Tax Assets, Gross [Abstract] Accrued compensation and benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Pensions Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Other postretirement benefit obligations Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Contract accounting methods Deferred Tax Assets Contract Accounting Methods Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from contract accounting methods. Foreign company operating losses and credits Deferred Tax Assets, Operating Loss Carryforwards, Foreign Other Deferred Tax Assets, Other Valuation allowance Deferred Tax Assets, Valuation Allowance Deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities related to: Deferred Tax Liabilities, Gross [Abstract] Goodwill and purchased intangibles Deferred Tax Liabilities, Goodwill and Intangible Assets Property, plant and equipment Deferred Tax Liabilities, Property, Plant and Equipment Exchanged debt securities and other Deferred Tax Liabilities, Other Deferred tax liabilities Deferred Tax Liabilities, Net Net deferred tax assets Deferred Tax Assets, Net Summary of Quarterly Information Quarterly Financial Information [Table Text Block] Retiree Medical and Life Insurance Plans Other Postretirement Benefits Plan [Member] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Recognized net actuarial losses Defined Benefit Plan, Amortization of Gain (Loss) Amortization of net prior service (credit) cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Total net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Income Taxes Income Tax Disclosure [Text Block] Postretirement Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Amount Effective Income Tax Rate Reconciliation, Amount [Abstract] Income tax expense at the U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Research and development tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Excess tax benefits for share-based payment awards Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Tax deductible dividends Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount Tax accounting method change Deferred tax write-down and transition tax Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount U.S. manufacturing deduction benefit Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total income tax expense Income Tax Expense (Benefit) Rate Effective Income Tax Rate Reconciliation, Percent [Abstract] Income tax expense at the U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Research and development tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Foreign derived intangible income deduction Effective Income Tax Rate Reconciliation, Deduction, Foreign Derived Intangible Income, Percent Effective Income Tax Rate Reconciliation, Deduction, Foreign Derived Intangible Income, Percent Excess tax benefits for share-based payment awards Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent Tax deductible dividends Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent Tax accounting method change, percent Effective Income Tax Rate Reconciliation, Change in Tax Accounting Method, Percent Effective Income Tax Rate Reconciliation, Change in Tax Accounting Method, Percent Deferred tax write-down and transition tax Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent U.S. manufacturing deduction benefit Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Other, net (d) Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Income tax expense Effective Income Tax Rate Reconciliation, Percent Qualified Plan Qualified Plan [Member] Qualified Defined Benefit Pension Plans Total net periodic benefit cost Less: CAS pension cost Pension Expense under US Government Cost Accounting Standards Pension expense calculated under U.S. Government Cost Accounting Standards. FAS pension service cost Non-operating FAS pension expense Financial Accounting Standards, Non-Operating Pension Expense Amount of cost attributable to the non-service component (i.e. interest cost, expected return on plan assets, net actuarial gains or losses and amortization of prior service cost or credits) of financial accounting standards defined benefit plan expense. Net FAS/CAS pension adjustment Fas Cas Pension Adjustment This item represents the difference between pension expense calculated for financial reporting purposes under GAAP and pension costs calculated and funded in accordance with U.S. Government Cost Accounting Standards (CAS). Non-operating FAS pension expense Operating lease, right-of-use asset Operating Lease, Right-of-Use Asset Operating lease, liability, noncurrent Operating Lease, Liability, Noncurrent New ROU operating lease assets and liabilities entered into Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Operating lease cost Operating Lease, Cost Operating lease cost Operating Lease, Expense Cash payments Operating Lease, Payments Federal income tax expense (benefit): Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Federal, State and Local, Tax Expense (Benefit) [Abstract] Operations Current Federal Tax Expense (Benefit) One-time charge due to tax legislation Tax Cuts And Jobs Act Of 2017, Income Tax Expense (Benefit), Current Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit), Current Deferred Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract] Operations Deferred Federal Income Tax Expense (Benefit) One-time charge due to tax legislation Tax Cuts And Jobs Act Of 2017, Income Tax Expense (Benefit), Deferred Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit), Deferred Total federal income tax expense Federal Income Tax Expense (Benefit), Continuing Operations Foreign income tax expense (benefit): Foreign Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Foreign Tax Expense (Benefit) Deferred Deferred Foreign Income Tax Expense (Benefit) Total foreign income tax expense Foreign Income Tax Expense (Benefit), Continuing Operations Level 3 Fair Value, Inputs, Level 3 [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Investments measured at fair value Investments Measured at Fair Value [Member] Investments Measured at Fair Value [Member] Investments measured at NAV Investments Measured at Net Asset Value [Member] Investments Measured at Net Asset Value [Member] Cash and cash equivalents Defined Benefit Plan, Cash and Cash Equivalents [Member] U.S. equity securities Defined Benefit Plan, Equity Securities, US [Member] International equity securities Defined Benefit Plan, Equity Securities, Non-US [Member] Commingled equity funds Defined Benefit Plan, Commingled Equity Funds [Member] Defined Benefit Plan, Commingled Equity Funds [Member] Corporate debt securities Corporate Debt Securities [Member] U.S. Government-sponsored enterprise securities US Government-sponsored Enterprises Debt Securities [Member] Other fixed income investments Other Fixed Income Investments [Member] Other Fixed Income Investments [Member] Commingled equity funds Commingled Funds [Member] Commingled Funds [Member] Real estate funds Defined Benefit Plan, Real Estate [Member] Receivables, net Receivables Net [Member] Receivables Net [Member] Fair value of plan assets at end of year Plan with benefit obligations equal to plan assets Defined Benefit Plan, Plan With Benefit Obligations Equal To Plan Assets Defined Benefit Plan, Plan With Benefit Obligations Equal To Plan Assets Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Postretirement Benefit Plans Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Other, net Accumulated Other, Net Adjustment Attributable To Parent [Member] Accumulated Other, Net Adjustment Attributable To Parent [Member] AOCL AOCI Attributable to Parent [Member] Recognition of net actuarial losses Accumulated Defined Benefits Plans Adjustment, Net Actuarial Loss Attributable To Parent [Member] Accumulated Defined Benefits Plans Adjustment, Net Actuarial Loss Attributable To Parent [Member] Amortization of net prior service credits Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Other Accumulated Defined Benefit Plans Adjustment, Other Than Pension Adjustments Attributable To Parent [Member] Accumulated Defined Benefit Plans Adjustment, Other Than Pension Adjustments Attributable To Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Other comprehensive loss before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from AOCL Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax [Abstract] Amounts reclassified from AOCL Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Reclassification of income tax effects from tax reform Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect Ending Balance AOCI related to postretirement benefit plans, tax benefit AOCI Including Portion Attributable to Noncontrolling Interest, Tax Earnings Per Share [Abstract] Schedule of Weighted Average Shares Outstanding Used to Compute Earnings Per Common Share Schedule of Weighted Average Number of Shares [Table Text Block] Statement of Comprehensive Income [Abstract] Tax benefit on net other comprehensive loss recognized during the period for postretirement benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax Tax expense on amounts reclassified from accumulated other comprehensive loss during the period for postretirement benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Restructuring and Related Activities [Abstract] Severance and Restructuring Charges Restructuring and Related Activities Disclosure [Text Block] Cover page. Document Type Document Type Document Annual Report Document Annual Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One 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 Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Assets Assets [Abstract] Current assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Contract assets Inventories Inventory, Net of Allowances, Customer Advances and Progress Billings Other current assets Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Intangible assets, net Deferred income taxes Deferred Income Tax Assets, Net Other noncurrent assets Other Assets, Noncurrent Total assets Assets Liabilities and equity Liabilities and Equity [Abstract] Current liabilities Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Contract liabilities Salaries, benefits and payroll taxes Employee-related Liabilities, Current Current maturities of long-term debt and commercial paper Debt, Current Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Long-term debt, net Long-term Debt, Excluding Current Maturities Accrued pension liabilities Liability, Defined Benefit Pension Plan, Noncurrent Other postretirement benefit liabilities Liability, Other Postretirement Defined Benefit Plan, Noncurrent Other noncurrent liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Stockholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Stockholders' Equity Attributable to Parent Noncontrolling interests in subsidiary Stockholders' Equity Attributable to Noncontrolling Interest Total equity Total liabilities and equity Liabilities and Equity Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Postretirement benefit plans Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] Net other comprehensive loss recognized during the period, net of tax benefit of $586 million in 2019, $136 million in 2018 and $375 million in 2017 Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Amounts reclassified from accumulated other comprehensive loss, net of tax expense of $247 million in 2019, $327 million in 2018 and $437 million in 2017 Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Other, net Other Comprehensive Income, Other, Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Stock-Based Compensation Share-based Payment Arrangement [Text Block] Number of RSUs (In thousands) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning balance, in shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted, in shares Vested, in shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited, in shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Ending balance, in shares Weighted Average Grant-Date Fair Value Per Share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Nonvested beginning balance, in dollars per share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, in dollars per share Vested, in dollars per share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited, in dollars per share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Nonvested ending balance, in dollars per share Summary Of Financial Information For Each Business Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Weighted average discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Health care trend rate assumed for next year Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Ultimate health care trend rate Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Earnings Per Share Earnings Per Share [Text Block] Equity Defined Benefit Plan, Equity Securities [Member] Fixed income Fixed Income Securities [Member] Commodities Commodity Contract [Member] Asset Allocation Ranges Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 4.25% due 2019 Four Point Two Five Percent Notes Due Two Thousand Nineteen [Member] Four Point Two Five Percent Notes Due Two Thousand Nineteen [Member] 2.50% due 2020 Two Point Five Zero Percent Notes Due Twenty Twenty [Member] Two Point Five Zero Percent Notes Due Twenty Twenty [Member] 3.35% due 2021 Three Point Three Five Percent Notes Due Two Thousand Twenty One [Member] Three Point Three Five Percent Notes Due Two Thousand Twenty One [Member] 3.10% due 2023 Three Point One Zero Percent Notes Due Twenty Twenty Three[Member] Three Point One Zero Percent Notes Due Twenty Twenty Three[Member] 2.90% due 2025 Two Point Nine Zero Percent Notes Due Twenty Twenty Five [Member] Two Point Nine Zero Percent Notes Due Twenty Twenty Five [Member] 3.55% due 2026 Three Point Five Five Percent Notes Due Twenty Twenty Six [Member] Three Point Five Five Percent Notes Due Twenty Twenty Six [Member] 3.60% due 2035 Three Point Six Zero Percent Notes Due Twenty Thirty Five [Member] Three Point Six Zero Percent Notes Due Twenty Thirty Five [Member] 4.50% and 6.15% due 2036 Four Point Five Zero Percentage and Six Point One Five Percent Due Twenty Thirty Six [Member] Four Point Five Zero Percentage and Six Point One Five Percent Due Twenty Thirty Six [Member] 4.07% due 2042 Four Point Zero Seven Percent Notes Due Two Thousand Forty Two [Member] Four Point Zero Seven Percent Notes Due Two Thousand Forty Two [Member] 3.80% due 2045 Three Point Eight Zero Percent Notes Due Twenty Forty Five [Member] Three Point Eight Zero Percent Notes Due Twenty Forty Five [Member] 4.70% due 2046 Four Point Seven Zero Percent Notes Due Twenty Forty Six [Member] Four Point Seven Zero Percent Notes Due Twenty Forty Six [Member] 4.09% due 2052 Four Point Zero Nine Percent Notes Due Twenty Fifty Two [Member] Four Point Zero Nine Percent Notes Due Twenty Fifty Two [Member] Other notes with rates from 4.85% to 9.13%, due 2022 to 2041 Other Notes, Four Point Eight Five Percent To Nine Point One Three Percent Due Two Thousand Twenty Two To Two Thousand Forty One [Member] Other Notes, Four Point Eight Five Percent To Eight Point Five Zero Percent Due Two Thousand Twenty Three To Two Thousand Forty One [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Interest rate Debt Instrument, Interest Rate, Stated Percentage Long-term debt maturity year Debt Instrument Maturity Date Year Year the debt instrument matures. Total debt Commercial paper Commercial Paper Less: unamortized discounts and issuance costs Total debt, net Long-term Debt Less: current portion Long-term Debt, Current Maturities Changes in the Carrying Amount of Goodwill by Segment Schedule of Goodwill [Table Text Block] The Gross Carrying Amounts and Accumulated Amortization of Acquired Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] The Gross Carrying Amounts and Accumulated Amortization of Acquired Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Income Statement [Abstract] Statement [Table] Statement [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Products Product [Member] Services Service [Member] Other unallocated, net Other Unallocated, Net [Member] Other Unallocated, Net [Member] Statement [Line Items] Statement [Line Items] Net sales Revenues [Abstract] Total net sales Revenue from Contract with Customer, Excluding Assessed Tax Cost of sales Cost of Goods and Services Sold [Abstract] Total cost of sales Cost of Goods and Services Sold Severance and restructuring charges Gross profit Gross Profit Other income, net Other Operating Income (Expense), Net Operating profit Interest expense Interest Expense Other non-operating expense, net Other Nonoperating Income (Expense) Earnings from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense Net earnings from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Net earnings from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net earnings Earnings per common share Basic Earnings Per Share, Basic [Abstract] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Diluted Earnings Per Share, Diluted [Abstract] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Other Pension Plan Other Pension Plan [Member] Prepaid pension asset Assets for Plan Benefits, Defined Benefit Plan Accrued postretirement benefit liabilities Accumulated other comprehensive loss (pre-tax) related to: Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Net actuarial losses Prior service (credit) cost Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Total Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Accumulated other comprehensive loss, after tax Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Adjustments, before tax Weighted average common shares outstanding for basic computations (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average dilutive effect of equity awards (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average common shares outstanding for diluted computations (in shares) Weighted Average Number of Shares Outstanding, Diluted Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Inventories Schedule of Inventory, Current [Table Text Block] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2016-02 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Operating lease, liability Future Minimum Lease Commitments Lessee, Operating Lease, Liability, Maturity [Table Text Block] Basic earnings per common share (in dollars per share) Diluted earnings per common share (in dollars per share) Leases Lessee, Operating Leases [Text Block] Change in benefit obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Beginning balance Defined Benefit Plan, Benefit Obligation Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Settlements Defined Benefit Plan, Benefit Obligation, Payment for Settlement Actuarial losses (gains) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Plan amendments and curtailments Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment Medicare Part D subsidy Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt Participants’ contributions Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Ending balance Change in plan assets Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Beginning balance at fair value Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Settlements Defined Benefit Plan, Plan Assets, Payment for Settlement Medicare Part D subsidy Defined Benefit Plan, Plan Assets, Prescription Drug Subsidy Receipt Participants’ contributions Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Ending balance at fair value Unfunded status of the plans Defined Benefit Plan, Funded (Unfunded) Status of Plan Curtailment gain Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment Information on Business Segments Segment Reporting Disclosure [Text Block] Expected Future Benefit Payment [Abstract] Defined Benefit Plan, Expected Future Benefit Payment [Abstract] 2020 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Five 2025 – 2029 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Unsecured Debt 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