Basis of Presentation (Unaudited) EAC Change (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Change in Accounting Estimate [Line Items]
Operating income	$ 1,043	$ 985	$ 4,909	$ 2,913
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	109	$ 123	$ 453	$ 359
F-35 Program | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems [Member]
Change in Accounting Estimate [Line Items]
Operating income	$ (42)