Segment Reporting Information (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 03, 2016	Jul. 05, 2015	Jul. 03, 2016	Jul. 05, 2015
Segment Reporting Information [Line Items]
Revenue		$ 7,665	$ 7,882	$ 15,389	$ 15,666
Operating earnings		1,070	1,081	2,123	2,108
Aerospace
Segment Reporting Information [Line Items]
Revenue		2,134	2,258	4,121	4,366
Operating earnings		434	439	845	870
Combat Systems
Segment Reporting Information [Line Items]
Revenue		1,315	1,408	2,588	2,771
Operating earnings		219	226	436	430
Information Systems and Technology
Segment Reporting Information [Line Items]
Revenue		2,229	2,215	4,562	4,585
Operating earnings		244	237	492	454
Marine Systems
Segment Reporting Information [Line Items]
Revenue		1,987	2,001	4,118	3,944
Operating earnings		181	187	373	375
Corporate
Segment Reporting Information [Line Items]
Revenue	[1]	0	0	0	0
Operating earnings	[1]	$ (8)	$ (8)	$ (23)	$ (21)

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