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Goodwill (Goodwill By Reportable Operating Segment) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Goodwill $ 17,216 $ 17,236
Acquisitions (1) [1]  
Accumulated impairment charges (871) (871)
Foreign exchange and other changes (19)  
Goodwill as adjusted for accumulated impairment charges 16,345 16,365
USFE&G [Member]
    
Goodwill [Line Items]    
Goodwill 15,950 15,950
Acquisitions 2 [1]  
Foreign exchange and other changes (2)  
Goodwill as adjusted for accumulated impairment charges 15,950 15,950
Commercial Power [Member]
    
Goodwill [Line Items]    
Goodwill 935 933
Acquisitions 2 [1]  
Accumulated impairment charges (871) (871)
Goodwill as adjusted for accumulated impairment charges 64 62
International [Member]
    
Goodwill [Line Items]    
Goodwill 331 353
Acquisitions (5) [1]  
Foreign exchange and other changes (17)  
Goodwill as adjusted for accumulated impairment charges 331 353
Progress Energy [Member]
    
Goodwill [Line Items]    
Goodwill as adjusted for accumulated impairment charges 3,655 3,655
Duke Energy Ohio [Member]
    
Goodwill [Line Items]    
Goodwill 2,324 2,325
Accumulated impairment charges (1,404) (1,404)
Foreign exchange and other changes (1)  
Goodwill as adjusted for accumulated impairment charges 920 921
Duke Energy Ohio [Member] | Franchised Electric & Gas [Member]
    
Goodwill [Line Items]    
Goodwill 1,136 1,137
Accumulated impairment charges (216) (216)
Foreign exchange and other changes (1)  
Goodwill as adjusted for accumulated impairment charges 920 921
Duke Energy Ohio [Member] | DEO Commercial Power [Member]
    
Goodwill [Line Items]    
Goodwill 1,188 1,188
Accumulated impairment charges (1,188) (1,188)
Goodwill as adjusted for accumulated impairment charges $ 0 $ 0
[1] Amounts represent purchase price adjustments related to the Progress Energy merger at USFE&G, a minor renewables acquisition at Commercial Power and the Chilean hydro acquisition at International Energy. See Note 2 for further information on purchase price adjustments related to the Progress Energy Merger.