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Severance (Tables)
9 Months Ended
Sep. 30, 2011
Severance 
Schedule Of Severance Liability
     Balance at
December 31, 2010
     Provision/
Adjustments
    Cash
Reductions
    Balance at
September 30, 2011
 
     (in millions)  

Duke Energy

   $ 87       $ 1      $ (52   $ 36   

Duke Energy Carolinas

     21         (1     (18     2   

Duke Energy Indiana

     1         —          (1     —