Revenue - Revenue by Products and Services (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Revenue [Line Items]
Revenue	$ 8,749	$ 9,261
Aerospace
Revenue [Line Items]
Revenue	1,691	2,240
Aerospace | Aircraft manufacturing and completions
Revenue [Line Items]
Revenue	1,194	1,733
Aerospace | Aircraft services
Revenue [Line Items]
Revenue	497	507
Combat Systems
Revenue [Line Items]
Revenue	1,708	1,636
Combat Systems | Military vehicles
Revenue [Line Items]
Revenue	1,146	1,134
Combat Systems | Weapons systems, armament and munitions
Revenue [Line Items]
Revenue	433	401
Combat Systems | Engineering and other services
Revenue [Line Items]
Revenue	129	101
Information Technology
Revenue [Line Items]
Revenue	1,988	2,169
Information Technology | Information technology services
Revenue [Line Items]
Revenue	1,988	2,169
Mission Systems
Revenue [Line Items]
Revenue	1,116	1,158
Mission Systems | C4ISR solutions
Revenue [Line Items]
Revenue	1,116	1,158
Marine Systems
Revenue [Line Items]
Revenue	2,246	2,058
Marine Systems | Nuclear-powered submarines
Revenue [Line Items]
Revenue	1,560	1,377
Marine Systems | Surface ships
Revenue [Line Items]
Revenue	462	446
Marine Systems | Repair and other services
Revenue [Line Items]
Revenue	$ 224	$ 235