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Organization And Basis Of Presentation (Tables)
 3 Months Ended
Mar. 31, 2012
Organization And Basis of Presentation [Abstract]  
Schedule Of Unbilled Revenues With Restricted Receivables
     March 31,
2012		      December 31,
2011		  
     (in millions)  

Duke Energy

    $ 666       $ 674   

Duke Energy Carolinas

      289         293   

Duke Energy Ohio

      39         50   

Duke Energy Indiana

      5         2