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
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to the parent company	$ 108	$ 75
Less: Redeemable noncontrolling interests adjustment to redemption value	0	0
Net income available to common stockholders - Numerator diluted	108	75
Net income available to common stockholders - Numerator basic	$ 108	$ 75
Weighted-average shares outstanding - Basic	145.6	144.6
Employee compensation-related shares, including stock options	1.9	1.3
Weighted-average shares outstanding - Diluted	147.5	145.9