Information on Business Segments - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total FAS/CAS pension adjustment	$ 738	$ 668	$ 2,095
Non-service FAS pension (expense) income	(971)	(1,292)	219
Segment Reconciling Items
Segment Reporting Information [Line Items]
Less: CAS pension cost	1,796	2,066	1,977
FAS pension service cost	(87)	(106)	(101)
Total FAS/CAS pension operating adjustment	1,709	1,960	1,876
Qualified Defined Benefit Pension Plans
Segment Reporting Information [Line Items]
FAS pension (expense) income	1,058	1,398	(118)
FAS pension service cost	(87)	(106)	(101)
Qualified Plan | Qualified Defined Benefit Pension Plans
Segment Reporting Information [Line Items]
FAS pension (expense) income	$ (1,058)	$ (1,398)	$ 118