Intangible Assets (Detail) - USD ($) $ in Millions		Apr. 03, 2016	Dec. 31, 2015
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	$ 2,380	$ 2,354
Accumulated Amortization		(1,621)	(1,591)
Net Carrying Amount		759	763
Contract and Program Intangible Assets
Intangible Assets [Line Items]
Gross Carrying Amount	[1],[2]	1,634	1,626
Accumulated Amortization	[2]	(1,236)	(1,214)
Net Carrying Amount	[2]	398	412
Trade Names and Trademarks
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	472	455
Accumulated Amortization		(134)	(127)
Net Carrying Amount		338	328
Technology and Software
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	120	119
Accumulated Amortization		(97)	(96)
Net Carrying Amount		23	23
Other Intangible Assets
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	154	154
Accumulated Amortization		(154)	(154)
Net Carrying Amount		$ 0	$ 0

[1] Change in gross carrying amounts consists primarily of adjustments for foreign currency translation and acquired intangible assets.

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