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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
CONDENSED CONSOLIDATED BALANCE SHEETS    
Goodwill, accumulated amortization and writedown $ 276 $ 276
Nonutility property, accumulated depreciation 127 118
Receivables, allowance for uncollectible accounts $ 6 $ 9