CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
NET INCOME	$ 80	$ 65
OTHER COMPREHENSIVE LOSS
Derivative instruments, net of tax (Note 7)	0	(2)
TOTAL COMPREHENSIVE INCOME	$ 80	$ 63