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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data
Sep. 30, 2011
Dec. 31, 2010
Statement of Financial Position [Abstract]  
Receivables, allowances for uncollectible accounts (in dollars)$ 97$ 85
Utility property, plant and equipment, accumulated depreciation (in dollars)6,7456,319
Nonutility property, plant and equipment, accumulated depreciation (in dollars)$ 104$ 100
Common stock, shares authorized560,000,000560,000,000
Common stock, shares issued434,888,104434,888,104
Common stock, shares outstanding434,888,104434,888,104