Stockholders' Equity - Changes in Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jan. 01, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,226	$ 838	$ 1,242	$ 831
Adoption of ASU 2016-16 tax adjustment, January 1, 2017					$ (179)
Net income attributable to the parent	69	57	215	155
Net income attributable to noncontrolling interest	3	4	13	9
Net income, including portion attributable to noncontrolling interests	72	61	228	164
Other comprehensive income (loss)	4	(24)	14	(12)
Other comprehensive income (loss) including portion attributable to nonredeemable noncontrolling interest	4	(24)	12	(12)
Common stock dividends	(9)	(8)	(26)	(26)
Redeemable noncontrolling interests adjustment to redemption value	(1)		(3)
Distributions to noncontrolling interests	(2)	(2)	(7)	(16)
Common stock share repurchases				(81)
Increase from business combination			14
Purchase of noncontrolling interests	(1)		(1)
Stock compensation	9	5	21	11
Stock withheld for employee taxes	(1)	0	(4)	(1)
Ending Balance	1,297	870	1,297	870
Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,119	743	1,157	728
Adoption of ASU 2016-16 tax adjustment, January 1, 2017					$ (179)
Other comprehensive income (loss)	2	(24)	7	(13)
Common stock dividends	(9)	(8)	(26)	(26)
Redeemable noncontrolling interests adjustment to redemption value	(1)		(3)
Common stock share repurchases				(81)
Stock compensation	9	5	21	11
Stock withheld for employee taxes	(1)		(4)	(1)
Ending Balance	1,188	773	1,188	773
Attributable to Non-Controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	107	95	85	103
Other comprehensive income (loss)	2		5	1
Distributions to noncontrolling interests	(2)	(2)	(7)	(16)
Increase from business combination			14
Purchase of noncontrolling interests	(1)		(1)
Ending Balance	$ 109	$ 97	$ 109	$ 97