CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
NET INCOME	$ 81	$ 74	$ 161	$ 139
OTHER COMPREHENSIVE LOSS
Derivative instruments, net of tax (Note 7)	(2)	(5)	(2)	(7)
TOTAL COMPREHENSIVE INCOME	$ 79	$ 69	$ 159	$ 132