Consolidated Statements of Cash Flows (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 882	$ 897
Adjustments to reconcile to net cash provided by operating activities:
Depreciation, decommissioning and amortization	1,058	945
Regulatory impacts of net nuclear decommissioning trust earnings	131	106
Other amortization	97	82
Stock-based compensation	12	12
Deferred income taxes and investment tax credits	526	336
Changes in operating assets and liabilities:
Receivables	(253)	(197)
Inventory	(8)	(5)
Margin and collateral deposits - net of collateral received	(9)	1
Prepaid taxes	48	33
Other current assets	(280)	(279)
Accounts payable	142	(3)
Accrued taxes	77	140
Other current liabilities	(230)	(103)
Derivative assets and liabilities - net	433	1,012
Regulatory assets and liabilities - net	(363)	(530)
Other assets	(21)	(26)
Other liabilities	30	235
Net cash provided by operating activities	2,272	2,656
Cash flows from financing activities:
Long-term debt issued	497	1,135
Long-term debt issuance costs	(5)	(16)
Long-term debt repaid	(12)	(256)
Bonds purchased	(86)	0
Preference stock issued - net	123	0
Short-term debt financing - net	550	0
Settlements of stock-based compensation - net	(7)	(2)
Dividends paid	(388)	(239)
Net cash provided by financing activities	672	622
Cash flows from investing activities:
Capital expenditures	(3,014)	(2,659)
Proceeds from sale of nuclear decommissioning trust investments	2,108	903
Purchases of nuclear decommissioning trust investments and other	(2,254)	(1,036)
Customer advances for construction and other investments	24	1
Effect of deconsolidation of variable interest entities	0	(92)
Net cash used by investing activities	(3,136)	(2,883)
Net increase (decrease) in cash and cash equivalents	(192)	395
Cash and cash equivalents, beginning of period	257	462
Cash and cash equivalents, end of period	$ 65	$ 857