Segment Reporting Information (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 05, 2015	Jun. 29, 2014	Jul. 05, 2015	Jun. 29, 2014
Segment Reporting Information [Line Items]
Revenues		$ 7,882	$ 7,474	$ 15,666	$ 14,739
Operating Earnings		1,081	949	2,108	1,823
Aerospace
Segment Reporting Information [Line Items]
Revenues		2,258	1,995	4,366	4,120
Operating Earnings		439	384	870	788
Combat Systems
Segment Reporting Information [Line Items]
Revenues		1,408	1,465	2,771	2,723
Operating Earnings		226	220	430	359
Marine Systems
Segment Reporting Information [Line Items]
Revenues		2,001	1,851	3,944	3,452
Operating Earnings		187	174	375	340
Information Systems and Technology
Segment Reporting Information [Line Items]
Revenues		2,215	2,163	4,585	4,444
Operating Earnings		237	188	454	371
Corporate
Segment Reporting Information [Line Items]
Revenues	[1]	0	0	0	0
Operating Earnings	[1]	$ (8)	$ (17)	$ (21)	$ (35)

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