STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 433	$ 276	$ 261
Other comprehensive income:
Net deferred gain (loss) from cash flow hedges (net of tax of $-0-, $-0-, and $-0-)	(1)	1	0
Total	(1)	1	0
Comprehensive income	$ 432	$ 277	$ 261