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Goodwill (Goodwill By Reportable Operating Segment) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Goodwill $ 4,720 $ 4,720
Goodwill accumulated impairment charges (871) (871)
Foreign Exchange and Other Changes (7)  
Goodwill as adjusted for accumulated impairment charges 3,842 3,849
Duke Energy Ohio [Member]
   
Goodwill 2,325 2,325
Goodwill accumulated impairment charges (1,404) (1,404)
Goodwill as adjusted for accumulated impairment charges 921 921
USFE&G [Member]
   
Goodwill 3,483 3,483
Goodwill as adjusted for accumulated impairment charges 3,483 3,483
Commercial Power [Member]
   
Goodwill 940 940
Goodwill accumulated impairment charges (871) (871)
Goodwill as adjusted for accumulated impairment charges 69 69
International [Member]
   
Goodwill 297 297
Foreign Exchange and Other Changes (7)  
Goodwill as adjusted for accumulated impairment charges 290 297
Franchised Electric & Gas [Member] | Duke Energy Ohio [Member]
   
Goodwill 1,137 1,137
Goodwill accumulated impairment charges (216) (216)
Goodwill as adjusted for accumulated impairment charges 921 921
DEO Commercial Power [Member] | Duke Energy Ohio [Member]
   
Goodwill 1,188 1,188
Goodwill accumulated impairment charges (1,188) (1,188)
Goodwill as adjusted for accumulated impairment charges $ 0 $ 0