Segment Reporting Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 28, 2014		Sep. 29, 2013		Sep. 28, 2014		Sep. 29, 2013
Segment Reporting Information [Line Items]
Revenues	$ 7,751		$ 7,735		$ 22,490		$ 22,883
Operating Earnings	999		961		2,822		2,765
Aerospace
Segment Reporting Information [Line Items]
Revenues	2,289		2,152		6,409		5,983
Operating Earnings	411		369		1,199		1,068
Combat Systems
Segment Reporting Information [Line Items]
Revenues	1,395		1,306		4,118		4,241
Operating Earnings	232		228		591		658
Marine Systems
Segment Reporting Information [Line Items]
Revenues	1,820		1,697		5,272		5,082
Operating Earnings	170		170		510		507
Information Systems and Technology
Segment Reporting Information [Line Items]
Revenues	2,247		2,580		6,691		7,577
Operating Earnings	202		216		573		599
Corporate
Segment Reporting Information [Line Items]
Revenues	0	[1]	0	[1]	0	[1]	0	[1]
Operating Earnings	$ (16)	[1]	$ (22)	[1]	$ (51)	[1]	$ (67)	[1]

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