Information on Business Segments - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Non-service FAS pension (expense) income	$ (1,292)	$ 219	$ (577)
Net FAS/CAS pension adjustment	668	2,095	1,472
Segment Reconciling Items
Segment Reporting Information [Line Items]
FAS pension service cost	(106)	(101)	(516)
Less: CAS pension cost	2,066	1,977	2,565
FAS/CAS operating adjustment	1,960	1,876	2,049
Qualified Defined Benefit Pension Plans
Segment Reporting Information [Line Items]
FAS pension (expense) income	1,398	(118)	1,093
FAS pension service cost	(106)	(101)	(516)
Qualified Plan | Qualified Defined Benefit Pension Plans
Segment Reporting Information [Line Items]
FAS pension (expense) income	$ (1,398)	$ 118	$ (1,093)