Changes In Amount Of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 13,576
Acquisitions Goodwill Acquired During Period	366	[1]
Other	44	[2]
Goodwill, end of period	13,986
Aerospace
Goodwill [Roll Forward]
Goodwill, beginning of period	2,644
Acquisitions Goodwill Acquired During Period	14	[1]
Other	(5)	[2]
Goodwill, end of period	2,653
Combat Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	2,839
Acquisitions Goodwill Acquired During Period	87	[1]
Other	40	[2]
Goodwill, end of period	2,966
Marine Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	229
Acquisitions Goodwill Acquired During Period	38	[1]
Other	1	[2]
Goodwill, end of period	268
Information Systems and Technology
Goodwill [Roll Forward]
Goodwill, beginning of period	7,864
Acquisitions Goodwill Acquired During Period	227	[1]
Other	8	[2]
Goodwill, end of period	$ 8,099

[1] Includes adjustments during the purchase price allocation period.

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