Changes In Amount Of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 05, 2015		Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 11,731	[1]
Other	(32)	[2]
Goodwill, end of period	11,699
Aerospace
Goodwill [Roll Forward]
Goodwill, beginning of period	2,555	[1]
Other	58	[2]
Goodwill, end of period	2,613
Combat Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	2,750	[1]
Other	(74)	[2]
Goodwill, end of period	2,676
Marine Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	289	[1]
Other	0	[2]
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	6,137	[1]
Other	(16)	[2]
Goodwill, end of period	$ 6,121

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

[2] Consists primarily of adjustments for foreign currency translation.