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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 414 $ 462
Adjustments to reconcile to net cash provided by operating activities:    
Depreciation, decommissioning and amortization 788 700
Regulatory impacts of net nuclear decommissioning trust earnings 114 75
Other amortization 37 62
Stock-based compensation 8 8
Deferred income taxes and investment tax credits 250 436
Proceeds from U.S. treasury grants 29 0
Changes in operating assets and liabilities:    
Receivables 11 61
Inventory 15 1
Margin and collateral deposits - net of collateral received (3) (8)
Prepaid taxes 3 107
Other current assets (203) (167)
Accounts payable 28 15
Accrued taxes (14) (18)
Other current liabilities (79) (191)
Derivative assets and liabilities - net (72) 326
Regulatory assets and liabilities - net 245 (260)
Other assets (21) (191)
Other liabilities (39) (33)
Net cash provided by operating activities 1,511 1,385
Cash flows from financing activities:    
Long-term debt issued 395 497
Long-term debt issuance costs (4) (5)
Long-term debt repaid (3) (3)
Bonds purchased 0 (56)
Preferred stock issued - net 805 123
Preference stock redeemed (75) 0
Short-term debt financing - net (125) 200
Settlements of stock-based compensation - net (20) (7)
Dividends paid (261) (258)
Net cash provided by financing activities 712 491
Cash flows from investing activities:    
Capital expenditures (2,125) (2,019)
Proceeds from sale of nuclear decommissioning trust investments 1,097 1,146
Purchases of nuclear decommissioning trust investments and other (1,222) (1,230)
Customer advances for construction and other investments 11 12
Net cash used by investing activities (2,239) (2,091)
Net decrease in cash and cash equivalents (16) (215)
Cash and cash equivalents, beginning of period 57 257
Cash and cash equivalents, end of period $ 41 $ 42