Acquisitions and Divestitures, Goodwill, and Intangible Assets Intangible Assets (Details) - USD ($) $ in Millions		Jul. 02, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	$ 2,387	$ 2,354
Accumulated Amortization		(1,702)	(1,676)
Net Carrying Amount		685	678
Contract and Program Intangible Assets
Intangible Assets [Line Items]
Gross Carrying Amount	[1],[2]	1,628	1,633
Accumulated Amortization	[2]	(1,287)	(1,281)
Net Carrying Amount	[2]	341	352
Trade Names and Trademarks
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	475	446
Accumulated Amortization		(157)	(139)
Net Carrying Amount		318	307
Technology and Software
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	129	121
Accumulated Amortization		(104)	(102)
Net Carrying Amount		25	19
Other Intangible Assets
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	155	154
Accumulated Amortization		(154)	(154)
Net Carrying Amount		$ 1	$ 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.