Segment Reporting Information (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Oct. 04, 2015	Sep. 28, 2014	Oct. 04, 2015	Sep. 28, 2014
Segment Reporting Information [Line Items]
Revenue		$ 7,994	$ 7,751	$ 23,660	$ 22,490
Operating Earnings		1,034	999	3,142	2,822
Aerospace
Segment Reporting Information [Line Items]
Revenue		2,343	2,289	6,709	6,409
Operating Earnings		426	411	1,296	1,199
Combat Systems
Segment Reporting Information [Line Items]
Revenue		1,345	1,395	4,116	4,118
Operating Earnings		218	232	648	591
Information Systems and Technology
Segment Reporting Information [Line Items]
Revenue		2,219	2,247	6,804	6,691
Operating Earnings		219	202	673	573
Marine Systems
Segment Reporting Information [Line Items]
Revenue		2,087	1,820	6,031	5,272
Operating Earnings		181	170	556	510
Corporate
Segment Reporting Information [Line Items]
Revenue	[1]	0	0	0	0
Operating Earnings	[1]	$ (10)	$ (16)	$ (31)	$ (51)

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