CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 94	$ 100
Other comprehensive income
Change in fair value of cash flow hedges (Note 13)	(13)	(5)
Reclassification to net income of gains and losses on cash flow hedges	0	0
Comprehensive income	81	95
Comprehensive income attributable to non-controlling interests	6	7
Comprehensive income attributable to controlling interests	$ 75	$ 88