CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net income	$ 52	$ 18
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	233	152
Amortization of deferred financing costs	3	3
Deferred income taxes	(20)	8
Changes in other assets and liabilities:
Accounts and notes receivable, net	9	23
Accounts receivable/payable–affiliated companies	(5)	(56)
Inventory	4	4
Accounts payable	(16)	48
Taxes receivable	0	(3)
Interest and taxes accrued	(54)	(68)
Net regulatory assets and liabilities	(26)	(28)
Other current assets	2	0
Other current liabilities	(2)	(3)
Other assets	1	3
Other liabilities	(2)	4
Other, net	1	(1)
Net cash provided by operating activities	180	104
Cash Flows from Investing Activities:
Capital expenditures	(230)	(210)
Increase in notes receivable–affiliated companies	(133)	(107)
Other, net	(1)	(2)
Net cash used in investing activities	(364)	(319)
Cash Flows from Financing Activities:
Proceeds from long-term debt, net	398	298
Payments of long-term debt	(165)	(155)
Decrease in notes payable–affiliated companies	(60)	0
Dividend to parent	(32)	(32)
Debt issuance costs	(3)	(2)
Other, net	1	1
Net cash provided by financing activities	139	110
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(45)	(105)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	274	381
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 229	$ 276