Stockholders' Equity - Changes in Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,114	$ 1,242
Net income attributable to the parent	108	75
Net income attributable to noncontrolling interest	2	5
Net income, including portion attributable to nonredeemable noncontrolling interests	110	80
Other comprehensive income (loss)	9	31
Other comprehensive income (loss) including portion attributable to nonredeemable noncontrolling interest	8	32
Common stock dividends	(15)	(9)
Distributions to noncontrolling interests	(1)	(1)
Increase from business combination	0	14
Purchase of noncontrolling interests	0
Stock compensation	5	7
Stock withheld for employee taxes	(6)	(3)
Ending Balance	1,215	1,183
Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,013	1,157
Other comprehensive income (loss)	8	30
Common stock dividends	(15)	(9)
Purchase of noncontrolling interests	(9)
Stock compensation	5	7
Stock withheld for employee taxes	(6)	(3)
Ending Balance	1,104	1,078
Attributable to Non-Controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	101	85
Other comprehensive income (loss)		2
Distributions to noncontrolling interests	(1)	(1)
Increase from business combination		14
Purchase of noncontrolling interests	9
Ending Balance	$ 111	$ 105
Accounting Standards Update 2016-16 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact on retained earnings			$ (179)
Accounting Standards Update 2016-16 [Member] | Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact on retained earnings			$ (179)