Earnings Per Share - Reconciliation of the Numerators and Denominators of the Earnings Per Share Calculations (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to the parent company	$ 69	$ 57	$ 215	$ 155
Less: Redeemable noncontrolling interests adjustment to redemption value	(1)		(3)
Net income available to common stockholders - Numerator diluted	68	57	212	155
Net income available to common stockholders - Numerator basic	$ 68	$ 57	$ 212	$ 155
Weighted-average shares outstanding - Basic	145.0	144.0	144.8	146.7
Employee compensation-related shares, including stock options	1.9	0.6	1.7	0.4
Weighted-average shares outstanding - Diluted	146.9	144.6	146.5	147.1