Stockholders' Equity - Changes in Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jan. 01, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,183	$ 884	$ 1,242	$ 831
Adoption of ASU 2016-16 tax adjustment, January 1, 2017					$ (179)
Net income attributable to the parent	71	53	146	98
Net income attributable to noncontrolling interest	5	2	10	5
Net income, including portion attributable to noncontrolling interests	76	55	156	103
Other comprehensive income (loss)	(21)	(30)	10	12
Other comprehensive income (loss) including portion attributable to nonredeemable noncontrolling interest	(24)	(30)	8	12
Common stock dividends	(8)	(9)	(17)	(18)
Redeemable noncontrolling interests adjustment to redemption value	(2)		(2)
Distributions to noncontrolling interests	(4)	(13)	(5)	(14)
Common stock share repurchases		(53)		(81)
Increase from business combination			14
Stock compensation	5	4	12	6
Stock withheld for employee taxes			(3)	(1)
Ending Balance	1,226	838	1,226	838
Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,078	778	1,157	728
Adoption of ASU 2016-16 tax adjustment, January 1, 2017					$ (179)
Other comprehensive income (loss)	(25)	(30)	5	11
Common stock dividends	(8)	(9)	(17)	(18)
Redeemable noncontrolling interests adjustment to redemption value	(2)		(2)
Common stock share repurchases		(53)		(81)
Stock compensation	5	4	12	6
Stock withheld for employee taxes			(3)	(1)
Ending Balance	1,119	743	1,119	743
Attributable to Non-Controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	105	106	85	103
Other comprehensive income (loss)	1		3	1
Distributions to noncontrolling interests	(4)	(13)	(5)	(14)
Increase from business combination			14
Ending Balance	$ 107	$ 95	$ 107	$ 95