Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 91	$ 51
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	111	114
(Decrease) increase in net liabilities from price risk management activities	(64)	95
Regulatory deferral - price risk management activities	64	(95)
Deferred income taxes	33	18
Regulatory deferral of settled derivative instruments	12	27
Power cost deferrals, net	12	(1)
Renewable adjustment clause deferrals	11	7
Senate Bill 408 deferrals, net	(4)	(7)
Allowance for equity funds used during construction	(2)	(8)
Decoupling mechanism deferrals, net	0	(8)
Other non-cash income and expenses, net	15	19
Changes in working capital:
Decrease in receivables	28	59
Decrease (increase) in margin deposits, net	16	(21)
Income tax refund received	8	53
Decrease in payables	(16)	(37)
Other working capital items, net	(5)	(9)
Contribution to pension plan	(26)	0
Other, net	(5)	(11)
Net cash provided by operating activities	279	246
Cash flows from investing activities:
Capital expenditures	(138)	(264)
Sales of Nuclear decommissioning trust securities	29	18
Purchases of Nuclear decommissioning trust securities	(31)	(17)
Distribution from Nuclear decommissioning trust	0	19
Other, net	1	(1)
Net cash used in investing activities	(139)	(245)
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	8
Payments on commercial paper, net	(19)	0
Dividends paid	(39)	(38)
Debt issuance costs	0	(2)
Noncontrolling interests’ capital distributions	(4)	0
Net cash (used in) provided by financing activities	(72)	31
Increase in cash and cash equivalents	68	32
Cash and cash equivalents, beginning of period	4	31
Cash and cash equivalents, end of period	72	63
Supplemental cash flow information is as follows:
Cash paid for interest, net of amounts capitalized	51	49
Cash paid for income taxes	3	0
Non-cash investing and financing activities:
Accrued capital additions	24	23
Accrued dividends payable	21	20
Preliminary engineering transferred to construction work in progress from Other noncurrent assets	$ 7	$ 0