STATEMENTS OF CONSOLIDATED MEMBER'S EQUITY - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]	AOCI Attributable to Parent [Member]
Shares, Outstanding at Dec. 31, 2014		1,000
Balance at Dec. 31, 2014		$ 0	$ 1,322	$ 270
Contribution from parent			0
Net income	$ 261			261
Dividend to parent				(252)
Balance at Dec. 31, 2015	1,601	$ 0	1,322	279	$ 0	$ 0
Shares, Outstanding at Dec. 31, 2015		1,000
Contribution from parent			374
Net income	276			276
Dividend to parent				(135)
Balance at Dec. 31, 2016	2,117	$ 0	1,696	420	1	1
Shares, Outstanding at Dec. 31, 2016		1,000
Contribution from parent			0
Net income	433			433
Dividend to parent				(180)
Balance at Dec. 31, 2017	$ 2,369	$ 0	$ 1,696	$ 673	$ 0	$ 0
Shares, Outstanding at Dec. 31, 2017		1,000