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Information on Business Segments - FAS/CAS Pension Adjustment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Non-operating FAS pension expense $ (577) $ (801) $ (737)
Net FAS/CAS pension adjustment 1,472 1,002 876
Non-operating FAS pension expense 577 801 737
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Less: CAS pension cost 2,565 2,433 2,248
FAS pension service cost (516) (630) (635)
FAS/CAS operating adjustment 2,049 1,803 1,613
Qualified Defined Benefit Pension Plans      
Segment Reporting Information [Line Items]      
Total net periodic benefit cost 1,093 1,431 1,372
FAS pension service cost (516) (630) (635)
Qualified Plan | Qualified Defined Benefit Pension Plans      
Segment Reporting Information [Line Items]      
Total net periodic benefit cost (1,093) (1,431) (1,372)
Non-operating FAS pension expense (116) (67) (109)
Non-operating FAS pension expense $ 116 $ 67 $ 109