Acquisitions, Divestitures, Goodwill and Intangible Assets - Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,398		$ 2,582
Accumulated Amortization	(1,486)		(1,538)
Net Carrying Amount	912		1,044
Impairment of Intangible Assets, Finite-lived	0		0		2,295
Contract and Program Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,652	[1]	1,790	[1]
Accumulated Amortization	(1,123)	[1]	(1,189)	[1]
Net Carrying Amount	529	[1]	601	[1]
Tradenames and Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	462		507
Accumulated Amortization	(113)		(103)
Net Carrying Amount	349		404
Technology and Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	130		130
Accumulated Amortization	(97)		(92)
Net Carrying Amount	33		38
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	154		155
Accumulated Amortization	(153)		(154)
Net Carrying Amount	1		1
Aerospace | Contract and Program Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived					191
Information Systems and Technology | Contract and Program Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived					$ 110

[1] Consists of acquired backlog and probable follow-on work and associated customer relationships