Revenue (Revenue by Customer) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue, Major Customer [Line Items]
Revenue	$ 39,407	$ 38,469	$ 37,925
U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	22,250	21,386	20,840
U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	4,808	4,862	4,726
U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	633	598	737
Total U.S. government
Revenue, Major Customer [Line Items]
Revenue	27,691	26,846	26,303
U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	5,709	4,808	4,891
Non-U.S. government
Revenue, Major Customer [Line Items]
Revenue	3,557	3,922	3,485
Non-U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	2,450	2,893	3,246
Aerospace
Revenue, Major Customer [Line Items]
Revenue	8,567	8,135	8,075
Aerospace | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	313	255	394
Aerospace | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	0	0	0
Aerospace | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	120	84	119
Aerospace | Total U.S. government
Revenue, Major Customer [Line Items]
Revenue	433	339	513
Aerospace | U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	5,236	4,381	4,268
Aerospace | Non-U.S. government
Revenue, Major Customer [Line Items]
Revenue	587	622	221
Aerospace | Non-U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	2,311	2,793	3,073
Marine Systems
Revenue, Major Customer [Line Items]
Revenue	11,040	10,526	9,979
Marine Systems | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	10,874	10,325	9,656
Marine Systems | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	2	6	9
Marine Systems | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	158	186	206
Marine Systems | Total U.S. government
Revenue, Major Customer [Line Items]
Revenue	11,034	10,517	9,871
Marine Systems | U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	3	3	97
Marine Systems | Non-U.S. government
Revenue, Major Customer [Line Items]
Revenue	3	4	9
Marine Systems | Non-U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	0	2	2
Combat Systems
Revenue, Major Customer [Line Items]
Revenue	7,308	7,351	7,223
Combat Systems | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	4,082	3,869	3,813
Combat Systems | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	9	10	12
Combat Systems | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	325	294	366
Combat Systems | Total U.S. government
Revenue, Major Customer [Line Items]
Revenue	4,416	4,173	4,191
Combat Systems | U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	237	223	254
Combat Systems | Non-U.S. government
Revenue, Major Customer [Line Items]
Revenue	2,563	2,881	2,704
Combat Systems | Non-U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	92	74	74
Technologies
Revenue, Major Customer [Line Items]
Revenue	12,492	12,457	12,648
Technologies | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	6,981	6,937	6,977
Technologies | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	4,797	4,846	4,705
Technologies | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	30	34	46
Technologies | Total U.S. government
Revenue, Major Customer [Line Items]
Revenue	11,808	11,817	11,728
Technologies | U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	233	201	272
Technologies | Non-U.S. government
Revenue, Major Customer [Line Items]
Revenue	404	415	551
Technologies | Non-U.S. commercial
Revenue, Major Customer [Line Items]
Revenue	$ 47	$ 24	$ 97