Revenue - Revenue by Products and Services (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Apr. 01, 2018
Revenue [Line Items]
Revenue		$ 9,261	$ 7,535
Aerospace
Revenue [Line Items]
Revenue		2,240	1,825
Aerospace | Aircraft manufacturing and completions
Revenue [Line Items]
Revenue		1,691	1,366
Aerospace | Aircraft services
Revenue [Line Items]
Revenue		507	451
Aerospace | Pre-owned aircraft
Revenue [Line Items]
Revenue		42	8
Combat Systems
Revenue [Line Items]
Revenue		1,636	1,440
Combat Systems | Military vehicles [Member]
Revenue [Line Items]
Revenue		1,134	956
Combat Systems | Weapons systems, armament and munitions
Revenue [Line Items]
Revenue		401	383
Combat Systems | Engineering and other services
Revenue [Line Items]
Revenue		101	101
Information Technology
Revenue [Line Items]
Revenue		2,169	1,138
Information Technology | Information technology services
Revenue [Line Items]
Revenue		2,169	1,138
Mission Systems
Revenue [Line Items]
Revenue		1,158	1,098
Mission Systems | C4ISR solutions
Revenue [Line Items]
Revenue	[1]	1,158	1,098
Marine Systems
Revenue [Line Items]
Revenue		2,058	2,034
Marine Systems | Nuclear-powered submarines
Revenue [Line Items]
Revenue		1,377	1,296
Marine Systems | Surface ships [Member]
Revenue [Line Items]
Revenue		446	483
Marine Systems | Repair and other services
Revenue [Line Items]
Revenue		$ 235	$ 255

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