CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 57	$ 75	$ 157	$ 177
Other comprehensive income
Change in fair value of cash flow hedges (Note 13)	(9)	(1)	(14)	6
Amortization of realized loss on derivative financial instruments		2		2
Reclassification of net income of gains and losses on cash flow hedges	1	3	1	3
Comprehensive income	49	79	144	188
Comprehensive income attributable to non-controlling interests	2	3	9	9
Comprehensive income attributable to controlling interests	$ 47	$ 76	$ 135	$ 179