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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
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