Changes In Amount Of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Goodwill [Line Items]
Goodwill, Impairment Loss			$ 1,994
Goodwill [Roll Forward]
Goodwill, beginning of period	12,048	[1]
Acquisitions Goodwill Acquired During Period	4	[2]
Other	(143)	[3]
Goodwill, end of period	11,909		12,048	[1]
Aerospace
Goodwill [Roll Forward]
Goodwill, beginning of period	2,697
Acquisitions Goodwill Acquired During Period	0
Other	(56)	[3]
Goodwill, end of period	2,641
Combat Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	2,961
Acquisitions Goodwill Acquired During Period	2	[2]
Other	(66)	[3]
Goodwill, end of period	2,897
Marine Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	290
Acquisitions Goodwill Acquired During Period	0
Other	0
Goodwill, end of period	290
Information Systems and Technology
Goodwill [Roll Forward]
Goodwill, beginning of period	6,100	[1]
Acquisitions Goodwill Acquired During Period	2	[2]
Other	(21)	[3]
Goodwill, end of period	$ 6,081

[1] (a)Goodwill on December 31, 2012, in the Information Systems and Technology reporting unit is net of $1,994 of accumulated impairment losses.

[2] (b)Includes adjustments during the purchase price allocation period.

[3] (c)Consists primarily of adjustments for foreign currency translation.