Revenue (Revenue by Customer) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue, Major Customer [Line Items]
Revenue	$ 38,469	$ 37,925	$ 39,350
U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	21,386	20,840	19,864
U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	4,862	4,726	5,254
U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	598	737	689
U.S. Government
Revenue, Major Customer [Line Items]
Revenue	26,846	26,303	25,807
U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	4,808	4,891	5,968
Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	3,922	3,485	3,744
Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	2,893	3,246	3,831
Aerospace
Revenue, Major Customer [Line Items]
Revenue	8,135	8,075	9,801
Aerospace | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	255	394	305
Aerospace | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	0	0	88
Aerospace | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	84	119	105
Aerospace | U.S. Government
Revenue, Major Customer [Line Items]
Revenue	339	513	498
Aerospace | U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	4,381	4,268	5,270
Aerospace | Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	622	221	399
Aerospace | Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	2,793	3,073	3,634
Marine Systems
Revenue, Major Customer [Line Items]
Revenue	10,526	9,979	9,183
Marine Systems | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	10,325	9,656	8,837
Marine Systems | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	6	9	2
Marine Systems | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	186	206	188
Marine Systems | U.S. Government
Revenue, Major Customer [Line Items]
Revenue	10,517	9,871	9,027
Marine Systems | U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	3	97	142
Marine Systems | Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	4	9	9
Marine Systems | Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	2	2	5
Combat Systems
Revenue, Major Customer [Line Items]
Revenue	7,351	7,223	7,007
Combat Systems | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	3,869	3,813	3,695
Combat Systems | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	10	12	13
Combat Systems | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	294	366	340
Combat Systems | U.S. Government
Revenue, Major Customer [Line Items]
Revenue	4,173	4,191	4,048
Combat Systems | U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	223	254	229
Combat Systems | Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	2,881	2,704	2,663
Combat Systems | Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	74	74	67
Technologies
Revenue, Major Customer [Line Items]
Revenue	12,457	12,648	13,359
Technologies | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	6,937	6,977	7,027
Technologies | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	4,846	4,705	5,151
Technologies | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	34	46	56
Technologies | U.S. Government
Revenue, Major Customer [Line Items]
Revenue	11,817	11,728	12,234
Technologies | U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	201	272	327
Technologies | Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	415	551	673
Technologies | Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	$ 24	$ 97	$ 125