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Information on Business Segments - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Non-operating FAS pension expense | $ (801) | $ (737) | $ (348)
Net FAS/CAS pension adjustment | 1,002 | 876 | 902
Segment Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Less: CAS pension cost | 2,433 | 2,248 | 1,921
FAS pension service cost | (630) | (635) | (671)
FAS/CAS operating adjustment | 1,803 | 1,613 | 1,250
Qualified Defined Benefit Pension Plans |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net periodic benefit cost | 1,431 | 1,372 | 1,019
FAS pension service cost | (630) | (635) | (671)
Qualified Plan | Qualified Defined Benefit Pension Plans |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net periodic benefit cost | (1,431) | (1,372) | (1,019)
Non-operating FAS pension expense | $ 67 | $ 109 | $ 123

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- Definition 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 + References No definition available. + Details
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- Definition 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). + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Pension expense calculated under U.S. Government Cost Accounting Standards. + References No definition available. + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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