Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 118	$ 99
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	170	173
(Decrease) increase in net liabilities from price risk management activities	(26)	202
Regulatory deferral - price risk management activities	26	(202)
Deferred income taxes	40	48
Power cost deferrals, net	17	(1)
Renewable adjustment clause deferrals	16	1
Regulatory deferral of settled derivative instruments	15	37
Senate Bill 408 deferrals, net	(5)	(30)
Allowance for equity funds used during construction	(3)	(12)
Decoupling mechanism deferrals, net	0	(9)
Other non-cash income and expenses, net	29	21
Changes in working capital:
Decrease in receivables	22	54
Increase in margin deposits, net	0	(61)
Income tax refund received	8	53
Increase (decrease) in payables and accrued liabilities	3	(16)
Other working capital items, net	13	5
Contribution to pension plan	(26)	(30)
Contribution to the voluntary employees’ beneficiary association trust	(14)	0
Other, net	(4)	(15)
Net cash provided by operating activities	399	317
Cash flows from investing activities:
Capital expenditures	(215)	(384)
Sales of Nuclear decommissioning trust securities	39	27
Purchases of Nuclear decommissioning trust securities	(41)	(25)
Distribution from Nuclear decommissioning trust	0	19
Other, net	3	(1)
Net cash used in investing activities	(214)	(364)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	0	249
Payments on long-term debt	(10)	(186)
Borrowings on short-term debt	0	11
(Payments) borrowings on commercial paper, net	(19)	9
Dividends paid	(59)	(58)
Debt issuance costs	0	(2)
Noncontrolling interests’ capital distributions	(4)	0
Net cash (used in) provided by financing activities	(92)	23
Change in cash and cash equivalents	93	(24)
Cash and cash equivalents, beginning of period	4	31
Cash and cash equivalents, end of period	97	7
Supplemental cash flow information is as follows:
Cash paid for interest, net of amounts capitalized	66	62
Cash paid for income taxes	3	0
Non-cash investing and financing activities:
Accrued capital additions	22	8
Accrued dividends payable	21	20
Preliminary engineering transferred to construction work in progress from Other noncurrent assets	$ 7	$ 0