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Goodwill (Tables)
9 Months Ended
Sep. 30, 2012
Goodwill By Reportable Operating Segment
Goodwill             
 The following tables show goodwill by segment for Duke Energy and Duke Energy Ohio:
              
Duke Energy            
(in millions) USFE&G Commercial Power International Energy Total
Balance at December 31, 2011:            
Goodwill $ 3,483 $ 940 $ 297 $ 4,720
Accumulated Impairment Charges     (871)     (871)
Balance at December 31, 2011, as adjusted for accumulated impairment charges   3,483   69   297   3,849
Balance at September 30, 2012:            
Goodwill   3,483   940   297   4,720
Acquisitions (a)   12,342       12,342
Accumulated Impairment Charges     (871)     (871)
Foreign Exchange and Other Changes     (7)   (4)   (11)
Balance at September 30, 2012, as adjusted for accumulated impairment charges $ 15,825 $ 62 $ 293 $ 16,180
              
(a)Represents goodwill resulting from the merger with Progress Energy. See Note ##ACQ for additional information.
Duke Energy Ohio [Member]
 
Goodwill By Reportable Operating Segment
Duke Energy Ohio         
(in millions) Franchised Electric & Gas Commercial Power Total
Balance at December 31, 2011:         
Goodwill $ 1,137 $ 1,188 $ 2,325
Accumulated Impairment Charges   (216)   (1,188)   (1,404)
Balance at December 31, 2011, as adjusted for accumulated impairment charges   921     921
Balance at September 30, 2012:         
Goodwill   1,137   1,188   2,325
Accumulated Impairment Charges   (216)   (1,188)   (1,404)
Balance at September 30, 2012, as adjusted for accumulated impairment charges $ 921 $ $ 921