Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Unrealized loss on cash flow hedge, Balance at beginning of period	$ 0	$ 0	$ 0	$ 0
Change in value of cash flow hedge, net of tax	(4)	0	(4)	0
Unrealized loss on cash flow hedge, Balance at end of period	(4)	0	(4)	0
Defined benefit plans, net: Balance at beginning of period	(14)	(10)	(13)	(11)
Unrealized gain on subsidiary pension, net of tax	1	0	0	1
Defined benefit plans, net: Balance at end of period	(13)	(10)	(13)	(10)
Foreign currency translation adjustment: Balance at beginning of period	(938)	(769)	(1,091)	(422)
Translation (loss) income	(83)	105	70	(242)
Foreign currency translation adjustment: Balance at end of period	(1,021)	(664)	(1,021)	(664)
Total accumulated other comprehensive loss	$ (1,038)	$ (674)	$ (1,038)	$ (674)	$ (1,104)