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Revenue - Revenue by Products and Services (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Revenue [Line Items]
Total revenue		$ 9,189	$ 9,220	$ 18,581	$ 18,609
Aerospace
Revenue [Line Items]
Total revenue		1,867	1,622	3,770	3,509
Aerospace | Aircraft manufacturing
Revenue [Line Items]
Total revenue		1,112	1,072	2,374	2,444
Aerospace | Aircraft services
Revenue [Line Items]
Total revenue		755	550	1,396	1,065
Marine Systems
Revenue [Line Items]
Total revenue		2,651	2,536	5,302	5,019
Marine Systems | Nuclear-powered submarines
Revenue [Line Items]
Total revenue		1,710	1,679	3,472	3,398
Marine Systems | Surface ships
Revenue [Line Items]
Total revenue		611	585	1,204	1,113
Marine Systems | Repair and other services
Revenue [Line Items]
Total revenue		330	272	626	508
Combat Systems
Revenue [Line Items]
Total revenue		1,666	1,899	3,341	3,719
Combat Systems | Military vehicles
Revenue [Line Items]
Total revenue		1,084	1,231	2,179	2,434
Combat Systems | Weapons systems, armament and munitions
Revenue [Line Items]
Total revenue		418	511	834	971
Combat Systems | Engineering and other services
Revenue [Line Items]
Total revenue		164	157	328	314
Technologies
Revenue [Line Items]
Total revenue		3,005	3,163	6,168	6,362
Technologies | Information technology (IT) services
Revenue [Line Items]
Total revenue		2,010	2,071	4,150	4,156
Technologies | C5ISR* solutions
Revenue [Line Items]
Total revenue	[1]	$ 995	$ 1,092	$ 2,018	$ 2,206
[1] Command, control, communications, computers, cyber, intelligence, surveillance and reconnaissance

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