Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jul. 01, 2012	Jun. 30, 2013		Jul. 01, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 42		$ 58	$ 89		$ 115
Gross Carrying Amount	2,881			2,881			2,915
Accumulated Amortization	(1,611)			(1,611)			(1,532)
Net Carrying Amount	1,270			1,270			1,383
Contract and Program Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,067	[1]		2,067	[1]		2,066	[1]
Accumulated Amortization	(1,239)	[1]		(1,239)	[1]		(1,165)	[1]
Net Carrying Amount	828	[1]		828	[1]		901	[1]
Tradenames and Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	487			487			494
Accumulated Amortization	(96)			(96)			(87)
Net Carrying Amount	391			391			407
Technology and Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	161			161			180
Accumulated Amortization	(113)			(113)			(108)
Net Carrying Amount	48			48			72
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	166			166			175
Accumulated Amortization	(163)			(163)			(172)
Net Carrying Amount	$ 3			$ 3			$ 3

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