Revenue (Revenue by Major Products and Services) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Revenue	$ 38,469	$ 37,925	$ 39,350
Aerospace
Revenue from External Customer [Line Items]
Revenue	8,135	8,075	9,801
Aerospace | Aircraft manufacturing and completions
Revenue from External Customer [Line Items]
Revenue	5,864	6,115	7,541
Aerospace | Aircraft services
Revenue from External Customer [Line Items]
Revenue	2,271	1,960	2,260
Marine Systems
Revenue from External Customer [Line Items]
Revenue	10,526	9,979	9,183
Marine Systems | Nuclear-powered submarines
Revenue from External Customer [Line Items]
Revenue	7,117	6,938	6,254
Marine Systems | Surface ships
Revenue from External Customer [Line Items]
Revenue	2,328	2,055	1,912
Marine Systems | Repair and other services
Revenue from External Customer [Line Items]
Revenue	1,081	986	1,017
Combat Systems
Revenue from External Customer [Line Items]
Revenue	7,351	7,223	7,007
Combat Systems | Military vehicles
Revenue from External Customer [Line Items]
Revenue	4,699	4,687	4,620
Combat Systems | Weapons systems, armament and munitions
Revenue from External Customer [Line Items]
Revenue	2,006	1,991	1,906
Combat Systems | Engineering and other services
Revenue from External Customer [Line Items]
Revenue	646	545	481
Technologies
Revenue from External Customer [Line Items]
Revenue	12,457	12,648	13,359
Technologies | Information technology services
Revenue from External Customer [Line Items]
Revenue	8,069	7,892	8,422
Technologies | C4ISR solutions
Revenue from External Customer [Line Items]
Revenue	$ 4,388	$ 4,756	$ 4,937