CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 100	$ 102
Other comprehensive income
Change in fair value of cash flow hedges (Note 13)	(5)	7
Comprehensive income	95	109
Comprehensive income attributable to non-controlling interests	7	6
Comprehensive income attributable to controlling interests	$ 88	$ 103