CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows from Operating Activities:
Net Income	$ 118	$ 133
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	69	66
Amortization of deferred financing costs	3	3
Deferred income taxes	70	80
Write-down of natural gas inventory	4	0
Equity in earnings of unconsolidated affiliates, net of distributions	2	(3)
Changes in other assets and liabilities:
Accounts receivable and unbilled revenues, net.	189	48
Accounts receivable/payable, affiliates	2	(27)
Inventory	97	180
Taxes receivable	(1)	58
Accounts payable	(153)	(155)
Fuel cost over (under) recovery	(43)	13
Interest and taxes accrued	16	20
Non-trading derivatives, net	(1)	3
Margin deposits, net.	14	36
Other current assets	(4)	13
Other current liabilities	(33)	(19)
Other assets	3	3
Other liabilities	9	9
Other, net	1	(1)
Net cash provided by operating activities	362	460
Cash Flows from Investing Activities:
Capital expenditures	(114)	(182)
Investment in unconsolidated affiliates	(4)	(3)
Other, net	0	(1)
Net cash used in investing activities	(118)	(186)
Cash Flows from Financing Activities:
Decrease in short-term borrowings, net	(53)	(53)
Payments of commercial paper, net	(285)	(5)
Proceeds from long-term debt	0	550
Payments of long-term debt	0	(606)
Cash paid for debt exchange	0	(58)
Debt issuance costs	0	(9)
Increase (decrease) in notes payable to affiliates	94	(92)
Other, net	4	0
Net cash used in financing activities	(240)	(273)
Net Increase in Cash and Cash Equivalents	4	1
Cash and Cash Equivalents at Beginning of Period	1	1
Cash and Cash Equivalents at End of Period	5	2
Cash Payments:
Interest, net of capitalized interest	33	41
Income tax refunds, net	0	(61)
Non-cash transactions:
Accounts payable related to capital expenditures	$ 39	$ 55