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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Statement of Financial Position [Abstract] |  |
Receivables, allowances for uncollectible accounts (in dollars) | $ 75 | $ 85
Utility property, plant and equipment, less accumulated depreciation of $6,894 and $6,319 at respective dates | 6,894 | 6,319
Nonutility property, plant and equipment, less accumulated depreciation of $107 and $100 at respective dates | $ 107 | $ 100
Common stock, no par value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized | 560,000,000 | 560,000,000
Common stock, shares issued | 434,888,104 | 434,888,104
Common stock, shares outstanding | 434,888,104 | 434,888,104

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