CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 59	$ 65	$ 216	$ 241
Other comprehensive income
Change in fair value of cash flow hedges (Note 13)	(1)	2	(15)	8
Amortization of realized loss on derivative financial instruments				2
Reclassification to net income of gains and losses on cash flow hedges	(2)	1	(1)	4
Comprehensive income	56	68	200	255
Comprehensive income attributable to non-controlling interests	3	2	12	11
Comprehensive income attributable to controlling interests	$ 53	$ 66	$ 188	$ 244