Revenue - Revenue by Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Revenue [Line Items]
Revenue	$ 9,761	$ 9,094	$ 28,577	$ 25,815
Aerospace
Revenue [Line Items]
Revenue	2,495	2,031	6,871	5,751
Aerospace | Aircraft manufacturing and completions
Revenue [Line Items]
Revenue	1,881	1,437	5,169	4,165
Aerospace | Aircraft services
Revenue [Line Items]
Revenue	523	525	1,567	1,507
Aerospace | Pre-owned aircraft
Revenue [Line Items]
Revenue	91	69	135	79
Combat Systems
Revenue [Line Items]
Revenue	1,740	1,523	5,035	4,497
Combat Systems | Military vehicles
Revenue [Line Items]
Revenue	1,137	991	3,361	2,937
Combat Systems | Weapons systems, armament and munitions
Revenue [Line Items]
Revenue	474	425	1,336	1,251
Combat Systems | Engineering and other services
Revenue [Line Items]
Revenue	129	107	338	309
Information Technology
Revenue [Line Items]
Revenue	2,071	2,307	6,398	5,887
Information Technology | Information technology services
Revenue [Line Items]
Revenue	2,071	2,307	6,398	5,887
Mission Systems
Revenue [Line Items]
Revenue	1,220	1,230	3,655	3,475
Mission Systems | C4ISR solutions
Revenue [Line Items]
Revenue	1,220	1,230	3,655	3,475
Marine Systems
Revenue [Line Items]
Revenue	2,235	2,003	6,618	6,205
Marine Systems | Nuclear-powered submarines
Revenue [Line Items]
Revenue	1,567	1,369	4,482	4,103
Marine Systems | Surface ships
Revenue [Line Items]
Revenue	402	445	1,376	1,401
Marine Systems | Repair and other services
Revenue [Line Items]
Revenue	$ 266	$ 189	$ 760	$ 701