CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 68	$ 59	$ 223	$ 216
Other comprehensive income
Change in fair value of cash flow hedges (Note 13)	0	(1)	(15)	(15)
Reclassification to net income of (gains) and losses on cash flow hedges (Note 13)	2	(2)	4	(1)
Comprehensive income	70	56	212	200
Comprehensive income attributable to non-controlling interests	3	3	13	12
Comprehensive income attributable to controlling interests	$ 67	$ 53	$ 199	$ 188