Revenue - Revenue by Products and Services (Details) - USD ($) $ in Millions		3 Months Ended
		Apr. 03, 2022	Apr. 04, 2021
Revenue [Line Items]
Revenue		$ 9,392	$ 9,389
Aerospace
Revenue [Line Items]
Revenue		1,903	1,887
Aerospace | Aircraft manufacturing
Revenue [Line Items]
Revenue		1,262	1,372
Aerospace | Aircraft services
Revenue [Line Items]
Revenue		641	515
Marine Systems
Revenue [Line Items]
Revenue		2,651	2,483
Marine Systems | Nuclear-powered submarines
Revenue [Line Items]
Revenue		1,762	1,719
Marine Systems | Surface ships
Revenue [Line Items]
Revenue		593	528
Marine Systems | Repair and other services
Revenue [Line Items]
Revenue		296	236
Combat Systems
Revenue [Line Items]
Revenue		1,675	1,820
Combat Systems | Military vehicles
Revenue [Line Items]
Revenue		1,095	1,203
Combat Systems | Weapons systems, armament and munitions
Revenue [Line Items]
Revenue		416	460
Combat Systems | Engineering and other services
Revenue [Line Items]
Revenue		164	157
Technologies
Revenue [Line Items]
Revenue		3,163	3,199
Technologies | Information Technology Services [Member]
Revenue [Line Items]
Revenue		2,140	2,085
Technologies | C5ISR* solutions
Revenue [Line Items]
Revenue	[1]	$ 1,023	$ 1,114

[1] Command, control, communications, computers, cyber, intelligence, surveillance and reconnaissance