Revenue (Revenue by Major Products and Services) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Revenue	$ 39,350	$ 36,193	$ 30,973
Aerospace
Revenue from External Customer [Line Items]
Revenue	9,801	8,455	8,129
Aerospace | Aircraft manufacturing and completions
Revenue from External Customer [Line Items]
Revenue	7,355	6,226	6,320
Aerospace | Aircraft services
Revenue from External Customer [Line Items]
Revenue	2,154	2,096	1,743
Aerospace | Pre-owned aircraft
Revenue from External Customer [Line Items]
Revenue	292	133	66
Combat Systems
Revenue from External Customer [Line Items]
Revenue	7,007	6,241	5,949
Combat Systems | Military vehicles
Revenue from External Customer [Line Items]
Revenue	4,620	4,027	3,731
Combat Systems | Weapons, armament and munitions
Revenue from External Customer [Line Items]
Revenue	1,906	1,798	1,633
Combat Systems | Engineering and other services
Revenue from External Customer [Line Items]
Revenue	481	416	585
Information Technology
Revenue from External Customer [Line Items]
Revenue	8,422	8,269	4,410
Information Technology | Information technology services
Revenue from External Customer [Line Items]
Revenue	8,422	8,269	4,410
Mission Systems
Revenue from External Customer [Line Items]
Revenue	4,937	4,726	4,481
Mission Systems | C4ISR solutions
Revenue from External Customer [Line Items]
Revenue	4,937	4,726	4,481
Marine Systems
Revenue from External Customer [Line Items]
Revenue	9,183	8,502	8,004
Marine Systems | Nuclear-powered submarines
Revenue from External Customer [Line Items]
Revenue	6,254	5,712	5,175
Marine Systems | Surface ships
Revenue from External Customer [Line Items]
Revenue	1,912	1,872	1,607
Marine Systems | Repair and other services
Revenue from External Customer [Line Items]
Revenue	$ 1,017	$ 918	$ 1,222