CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities:
Net income	$ 17	$ 31
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	189	151
Amortization of deferred financing costs	3	4
Deferred income taxes	(3)	(28)
Changes in other assets and liabilities:
Accounts and notes receivable, net	26	(3)
Accounts receivable/payable–affiliated companies	(60)	(82)
Inventory	4	8
Accounts payable	(14)	(21)
Taxes receivable	59	103
Interest and taxes accrued	(52)	(30)
Net regulatory assets and liabilities	(31)	19
Other current assets	15	15
Other current liabilities	10	(13)
Other assets	6	2
Other liabilities	0	2
Other, net	0	(1)
Net cash provided by operating activities	169	157
Cash Flows from Investing Activities:
Capital expenditures	(227)	(225)
Decrease in notes receivable–affiliated companies	0	107
Decrease (increase) in restricted cash of Bond Companies	(4)	5
Other, net	(4)	(3)
Net cash used in investing activities	(235)	(116)
Cash Flows from Financing Activities:
Payments of long-term debt	(145)	(137)
Increase in short-term notes payable–affiliated companies	153	19
Debt issuance costs	(1)	0
Net cash used in financing activities	7	(118)
Net Decrease in Cash and Cash Equivalents	(59)	(77)
Cash and Cash Equivalents at Beginning of Period	264	290
Cash and Cash Equivalents at End of Period	205	213
Cash Payments:
Interest, net of capitalized interest	67	71
Income tax refunds, net	(65)	(103)
Non-cash transactions:
Accounts payable related to capital expenditures	$ 54	$ 47