Stockholders' Equity - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 02, 2017	Jun. 30, 2018	Jul. 02, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 1,786	$ 1,499
Other comprehensive loss, net of tax	$ (115)	$ 10	(38)	56
Ending balance	1,982	1,746	1,982	1,746
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(505)	(598)
Other comprehensive loss, net of tax			(38)	56
Ending balance	(543)	(542)	(543)	(542)
Derivatives Net Unrealized Gains/ (Losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(3)	8
Other comprehensive loss, net of tax			0	(1)
Ending balance	(3)	7	(3)	7
Currency Translation Adjustment Net Unrealized Gain/(Losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(487)	(583)
Other comprehensive loss, net of tax			(38)	56
Ending balance	(525)	(527)	(525)	(527)
Benefit Plans Actuarial Gains/(Losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(15)	(23)
Other comprehensive loss, net of tax			0	1
Ending balance	$ (15)	$ (22)	$ (15)	$ (22)