CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 45	$ 23
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax	6	(5)
Total comprehensive income, net of tax	51	18
Less: Net income attributable to noncontrolling interests, net of tax	(1)	(1)
Less: Other comprehensive income (loss) attributable to noncontrolling interests		(1)
Total comprehensive loss attributable to noncontrolling interests	(1)	(2)
Comprehensive income attributable to common stockholders	$ 50	$ 16