CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 109	$ 152
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	56	49
Amortization of deferred financing costs	2	2
Deferred income taxes	68	89
Write-down of natural gas inventory	2	0
Equity in earnings of unconsolidated affiliates, net of distributions	20	(22)
Changes in other assets and liabilities:
Accounts receivable and unbilled revenues, net	62	(272)
Accounts receivable/payable - affiliated companies	0	(18)
Inventory	170	116
Taxes receivable	0	18
Accounts payable	(174)	141
Fuel cost recovery	86	(27)
Interest and taxes accrued	1	9
Non-trading derivatives, net	1	0
Margin deposits, net	(4)	1
Other current assets	7	13
Other current liabilities	(18)	(6)
Other assets	12	16
Other liabilities	11	23
Other, net	0	2
Net cash provided by operating activities	411	286
Cash Flows from Investing Activities:
Capital expenditures	(102)	(89)
Other, net	2	(1)
Net cash used in investing activities	(100)	(90)
Cash Flows from Financing Activities:
Decrease in short-term borrowings, net	(53)	(43)
Payments of commercial paper, net	(62)	(118)
Decrease in notes payable - affiliated companies	(188)	(19)
Other, net	0	1
Net cash used in financing activities	(303)	(179)
Net Increase in Cash and Cash Equivalents	8	17
Cash and Cash Equivalents at Beginning of Period	2	1
Cash and Cash Equivalents at End of Period	10	18
Cash Payments:
Interest, net of capitalized interest	28	28
Income taxes (refunds), net	3	(18)
Non-cash transactions:
Accounts payable related to capital expenditures	$ 27	$ 16