Goodwill and Acquired Intangibles (Detail) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
		Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Goodwill [Line Items]
Goodwill, beginning balance					$ 10,862	$ 10,348	[1]
Acquisitions						674
Impairments		$ (119)	$ (195)			(119)	[2],[3]	$ (195)	[3]
Other					(50)	(41)
Goodwill, ending balance		10,862	10,348	[1]	13,576	10,862		10,348	[1]
Sikorsky Aircraft Corporation
Goodwill [Line Items]
Acquisitions					2,764
Aeronautics
Goodwill [Line Items]
Goodwill, beginning balance					171	167	[1]
Acquisitions						4
Goodwill, ending balance		171	167	[1]	171	171		167	[1]
Information Systems & Global Solutions
Goodwill [Line Items]
Goodwill, beginning balance					2,898	2,649	[1]
Acquisitions						378
Impairments	[2]					(119)
Other					(17)	(10)
Goodwill, ending balance		2,898	2,649	[1]	2,881	2,898		2,649	[1]
Missiles and Fire Control
Goodwill [Line Items]
Goodwill, beginning balance					2,181	2,185	[1]
Other					17	(4)
Goodwill, ending balance		2,181	2,185	[1]	2,198	2,181		2,185	[1]
Mission Systems and Training
Goodwill [Line Items]
Goodwill, beginning balance					4,022	4,049	[1]
Other					(48)	(27)
Goodwill, ending balance		4,022	4,049	[1]	6,738	4,022		4,049	[1]
Mission Systems and Training | Sikorsky Aircraft Corporation
Goodwill [Line Items]
Acquisitions					2,764
Space Systems
Goodwill [Line Items]
Goodwill, beginning balance					1,590	1,298	[1]
Acquisitions						292
Other					(2)
Goodwill, ending balance		$ 1,590	$ 1,298	[1]	$ 1,588	$ 1,590		$ 1,298	[1]

[1] Includes reclassifications of goodwill among our business segments as a result of our program realignment, which occurred during the fourth quarter of 2015 (Note 1).

[2] The impairment in 2014 relates to our Technical Services reporting unit within our IS&GS business segment (Note 1).

[3] We recognized non-cash goodwill impairment charges related to the Technical Services reporting unit within our MFC business segment in 2014 and 2013. See Note 1 for more information.