Revenue (Revenue by Contract Type) (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
Aerospace
Revenue, Major Customer [Line Items]
Revenue	8,135	8,075	9,801
Marine Systems
Revenue, Major Customer [Line Items]
Revenue	10,526	9,979	9,183
Combat Systems
Revenue, Major Customer [Line Items]
Revenue	7,351	7,223	7,007
Technologies
Revenue, Major Customer [Line Items]
Revenue	12,457	12,648	13,359
Fixed-price
Revenue, Major Customer [Line Items]
Revenue	25,802	26,279	27,673
Fixed-price | Aerospace
Revenue, Major Customer [Line Items]
Revenue	7,329	7,402	8,949
Fixed-price | Marine Systems
Revenue, Major Customer [Line Items]
Revenue	6,711	6,924	6,331
Fixed-price | Combat Systems
Revenue, Major Customer [Line Items]
Revenue	6,400	6,159	6,049
Fixed-price | Technologies
Revenue, Major Customer [Line Items]
Revenue	5,362	5,794	6,344
Cost-reimbursement
Revenue, Major Customer [Line Items]
Revenue	9,897	9,342	8,996
Cost-reimbursement | Aerospace
Revenue, Major Customer [Line Items]
Revenue	0	0	0
Cost-reimbursement | Marine Systems
Revenue, Major Customer [Line Items]
Revenue	3,812	3,045	2,839
Cost-reimbursement | Combat Systems
Revenue, Major Customer [Line Items]
Revenue	890	997	894
Cost-reimbursement | Technologies
Revenue, Major Customer [Line Items]
Revenue	5,195	5,300	5,263
Time-and-materials
Revenue, Major Customer [Line Items]
Revenue	2,770	2,304	2,681
Time-and-materials | Aerospace
Revenue, Major Customer [Line Items]
Revenue	806	673	852
Time-and-materials | Marine Systems
Revenue, Major Customer [Line Items]
Revenue	3	10	13
Time-and-materials | Combat Systems
Revenue, Major Customer [Line Items]
Revenue	61	67	64
Time-and-materials | Technologies
Revenue, Major Customer [Line Items]
Revenue	$ 1,900	$ 1,554	$ 1,752