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Information on Business Segments - FAS/CAS Pension Adjustment (Details) - USD ($)
$ in Millions
 12 Months Ended
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