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Commitments And Contingencies (Divestiture Case) (Details) (DCPSC [Member], USD $)
In Millions
 6 Months Ended
Jun. 30, 2011
May 31, 2010
DCPSC [Member]
    
Portion of total disallowance contested $ 5  
Disallowed costs to be refunded to customers   11
Disallowed costs 6  
Disallowed interest costs to be contested 4  
Disallowed interest costs $ 5