Revenue - Revenue by Product Line (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Revenue [Line Items]
Revenue	$ 7,675	$ 7,774	$ 15,116	$ 15,250
Aerospace
Revenue [Line Items]
Revenue	2,078	2,284	4,152	4,065
Aerospace | Aircraft Manufacturing, Outfitting and Completions
Revenue [Line Items]
Revenue	1,600	1,842	3,229	3,218
Aerospace | Aircraft Services
Revenue [Line Items]
Revenue	445	404	880	805
Aerospace | Pre-Owned Aircraft
Revenue [Line Items]
Revenue	33	38	43	42
Combat Systems
Revenue [Line Items]
Revenue	1,414	1,297	2,701	2,542
Combat Systems | Wheeled Combat Vehicles
Revenue [Line Items]
Revenue	566	545	1,126	1,108
Combat Systems | Weapons Systems and Munitions
Revenue [Line Items]
Revenue	409	355	755	696
Combat Systems | Tanks and Tracked Vehicles
Revenue [Line Items]
Revenue	278	238	525	430
Combat Systems | Engineering and Other Services
Revenue [Line Items]
Revenue	161	159	295	308
Information Systems and Technology
Revenue [Line Items]
Revenue	2,104	2,215	4,250	4,543
Information Systems and Technology | Information Technology Services
Revenue [Line Items]
Revenue	1,052	1,096	2,110	2,238
Information Systems and Technology | C4ISR Solutions
Revenue [Line Items]
Revenue	1,052	1,119	2,140	2,305
Marine Systems
Revenue [Line Items]
Revenue	2,079	1,978	4,013	4,100
Marine Systems | Nuclear - Powered Submarines
Revenue [Line Items]
Revenue	1,342	1,278	2,546	2,665
Marine Systems | Surface Combatants
Revenue [Line Items]
Revenue	254	282	501	555
Marine Systems | Auxiliary and Commercial Ships
Revenue [Line Items]
Revenue	155	152	298	301
Marine Systems | Repair and Other Services
Revenue [Line Items]
Revenue	$ 328	$ 266	$ 668	$ 579