Revenue - Revenue by Customer (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
Combat Systems
Revenue [Line Items]
Revenue	1,414	1,297	2,701	2,542
Information Systems and Technology
Revenue [Line Items]
Revenue	2,104	2,215	4,250	4,543
Marine Systems
Revenue [Line Items]
Revenue	2,079	1,978	4,013	4,100
U.S. Government - Department of Defense
Revenue [Line Items]
Revenue	3,821	3,601	7,460	7,459
U.S. Government - Department of Defense | Aerospace
Revenue [Line Items]
Revenue	32	64	72	110
U.S. Government - Department of Defense | Combat Systems
Revenue [Line Items]
Revenue	636	499	1,223	1,013
U.S. Government - Department of Defense | Information Systems and Technology
Revenue [Line Items]
Revenue	1,137	1,198	2,312	2,504
U.S. Government - Department of Defense | Marine Systems
Revenue [Line Items]
Revenue	2,016	1,840	3,853	3,832
U.S. Government - Non Department of Defense
Revenue [Line Items]
Revenue	688	702	1,377	1,442
U.S. Government - Non Department of Defense | Aerospace
Revenue [Line Items]
Revenue	0	0	0	0
U.S. Government - Non Department of Defense | Combat Systems
Revenue [Line Items]
Revenue	25	25	49	45
U.S. Government - Non Department of Defense | Information Systems and Technology
Revenue [Line Items]
Revenue	663	676	1,328	1,394
U.S. Government - Non Department of Defense | Marine Systems
Revenue [Line Items]
Revenue	0	1	0	3
U.S. Government - Foreign Military Sales
Revenue [Line Items]
Revenue	153	176	340	345
U.S. Government - Foreign Military Sales | Aerospace
Revenue [Line Items]
Revenue	9	45	18	90
U.S. Government - Foreign Military Sales | Combat Systems
Revenue [Line Items]
Revenue	83	80	191	155
U.S. Government - Foreign Military Sales | Information Systems and Technology
Revenue [Line Items]
Revenue	21	12	33	24
U.S. Government - Foreign Military Sales | Marine Systems
Revenue [Line Items]
Revenue	40	39	98	76
U.S. Government
Revenue [Line Items]
Revenue	4,662	4,479	9,177	9,246
U.S. Government | Aerospace
Revenue [Line Items]
Revenue	41	109	90	200
U.S. Government | Combat Systems
Revenue [Line Items]
Revenue	744	604	1,463	1,213
U.S. Government | Information Systems and Technology
Revenue [Line Items]
Revenue	1,821	1,886	3,673	3,922
U.S. Government | Marine Systems
Revenue [Line Items]
Revenue	2,056	1,880	3,951	3,911
U.S. Commercial
Revenue [Line Items]
Revenue	1,030	1,194	2,149	2,394
U.S. Commercial | Aerospace
Revenue [Line Items]
Revenue	877	940	1,813	1,913
U.S. Commercial | Combat Systems
Revenue [Line Items]
Revenue	42	64	103	119
U.S. Commercial | Information Systems and Technology
Revenue [Line Items]
Revenue	94	98	183	185
U.S. Commercial | Marine Systems
Revenue [Line Items]
Revenue	17	92	50	177
Non U S Government
Revenue [Line Items]
Revenue	817	1,028	1,504	1,818
Non U S Government | Aerospace
Revenue [Line Items]
Revenue	64	238	69	315
Non U S Government | Combat Systems
Revenue [Line Items]
Revenue	594	603	1,096	1,150
Non U S Government | Information Systems and Technology
Revenue [Line Items]
Revenue	155	181	331	341
Non U S Government | Marine Systems
Revenue [Line Items]
Revenue	4	6	8	12
Non - U.S. Commercial
Revenue [Line Items]
Revenue	1,166	1,073	2,286	1,792
Non - U.S. Commercial | Aerospace
Revenue [Line Items]
Revenue	1,096	997	2,180	1,637
Non - U.S. Commercial | Combat Systems
Revenue [Line Items]
Revenue	34	26	39	60
Non - U.S. Commercial | Information Systems and Technology
Revenue [Line Items]
Revenue	34	50	63	95
Non - U.S. Commercial | Marine Systems
Revenue [Line Items]
Revenue	$ 2	$ 0	$ 4	$ 0