Changes In Amount Of Goodwill (Detail) - USD ($) $ in Millions		9 Months Ended
		Oct. 04, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	$ 11,731
Acquisitions/divestitures	[2]	(76)
Other	[3]	(122)
Goodwill, end of period		11,533
Aerospace
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	2,555
Acquisitions/divestitures	[2]	0
Other	[3]	29
Goodwill, end of period		2,584
Combat Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	2,750
Acquisitions/divestitures	[2]	0
Other	[3]	(120)
Goodwill, end of period		2,630
Marine Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	289
Acquisitions/divestitures	[2]	0
Other	[3]	0
Goodwill, end of period		289
Information Systems and Technology
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss			$ 1,994
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	6,137
Acquisitions/divestitures	[2]	(76)
Other	[3]	(31)
Goodwill, end of period		$ 6,030

[1] Goodwill on December 31, 2014, in the Information Systems and Technology reporting unit is net of $1,994 of accumulated impairment losses.

[2] Includes adjustments during the purchase price allocation period for the acquisition discussed above and an allocation of goodwill associated with the sale of a commercial cybersecurity business in the second quarter of 2015.

[3] Consists primarily of adjustments for foreign currency translation