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Consolidated Balance Sheets (USD $)
In Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
ASSETS    
Cash and cash equivalents $ 42 $ 257
Receivables, less allowances of $87 and $85 for uncollectible accounts at respective dates 655 715
Accrued unbilled revenue 619 442
Inventory 331 332
Prepaid taxes 61 168
Derivative assets 78 87
Regulatory assets 469 378
Other current assets 66 81
Total current assets 2,321 2,460
Nuclear decommissioning trusts 3,657 3,480
Other investments 84 68
Total investments 3,741 3,548
Utility property, plant and equipment, less accumulated depreciation of $6,486 and $6,319 at respective dates 25,847 24,778
Nonutility property, plant and equipment, less accumulated depreciation of $105 and $100 at respective dates 74 71
Total property, plant and equipment 25,921 24,849
Derivative assets 179 367
Regulatory assets 4,690 4,347
Other long-term assets 513 335
Total long-term assets 5,382 5,049
Total assets 37,365 35,906
LIABILITIES AND EQUITY    
Short-term debt 200  
Accounts payable 979 1,271
Accrued taxes 26 45
Accrued interest 189 169
Customer deposits 208 217
Derivative liabilities 231 212
Regulatory liabilities 820 738
Other current liabilities 510 663
Total current liabilities 3,163 3,315
Long-term debt 8,070 7,627
Deferred income taxes 5,255 4,829
Deferred investment tax credits 129 118
Customer advances 121 112
Derivative liabilities 558 449
Pensions and benefits 1,869 1,838
Asset retirement obligations 2,546 2,507
Regulatory liabilities 4,759 4,524
Other deferred credits and other long-term liabilities 1,359 1,380
Total deferred credits and other liabilities 16,596 15,757
Total liabilities 27,829 26,699
Commitments and contingencies (Note 9)    
Common stock, no par value (560,000,000 shares authorized; 434,888,104 shares issued and outstanding at each date) 2,168 2,168
Additional paid-in capital 581 572
Accumulated other comprehensive loss (23) (25)
Retained earnings 5,765 5,572
Total common shareholder's equity 8,491 8,287
Preferred and preference stock 1,045 920
Total equity 9,536 9,207
Total liabilities and equity $ 37,365 $ 35,906