Intangible Assets (Detail) - USD ($) $ in Millions		Oct. 04, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 2,363	$ 2,398
Accumulated Amortization		(1,563)	(1,486)
Net Carrying Amount		800	912
Contract and Program Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	[1]	1,627	1,652
Accumulated Amortization	[1]	(1,190)	(1,123)
Net Carrying Amount	[1]	437	529
Tradenames and Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		463	462
Accumulated Amortization		(124)	(113)
Net Carrying Amount		339	349
Technology and Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		119	130
Accumulated Amortization		(95)	(97)
Net Carrying Amount		24	33
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		154	154
Accumulated Amortization		(154)	(153)
Net Carrying Amount		$ 0	$ 1

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