Segment Reporting Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Segment Reporting Information [Line Items]
Revenue		$ 7,675	$ 7,774	$ 15,116	$ 15,250
Operating earnings		1,056	1,027	2,091	1,951
Aerospace
Segment Reporting Information [Line Items]
Revenue		2,078	2,284	4,152	4,065
Operating earnings		425	424	868	756
Combat Systems
Segment Reporting Information [Line Items]
Revenue		1,414	1,297	2,701	2,542
Operating earnings		225	205	430	392
Information Systems and Technology
Segment Reporting Information [Line Items]
Revenue		2,104	2,215	4,250	4,543
Operating earnings		240	234	476	471
Marine Systems
Segment Reporting Information [Line Items]
Revenue		2,079	1,978	4,013	4,100
Operating earnings		178	172	339	356
Corporate
Segment Reporting Information [Line Items]
Revenue	[1]	0	0	0	0
Operating earnings	[1]	$ (12)	$ (8)	$ (22)	$ (24)

[1] Corporate operating results consist primarily of stock option expense.