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Goodwill and Intangible Assets (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Goodwill $ 19,425,000,000 $ 19,425,000,000
Electric Utilities and Infrastructure [Member]    
Goodwill [Roll Forward]    
Goodwill 17,379,000,000 17,379,000,000
Gas Utilities and Infrastructure [Member]    
Goodwill [Roll Forward]    
Goodwill 1,924,000,000 1,924,000,000
Commercial Renewables [Member]    
Goodwill [Roll Forward]    
Goodwill 122,000,000 122,000,000
Duke Energy Ohio [Member]    
Goodwill [Roll Forward]    
Goodwill 920,000,000 920,000,000
Accumulated impairment charges 216,000,000 216,000,000
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member]    
Goodwill [Roll Forward]    
Goodwill 596,000,000 596,000,000
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member]    
Goodwill [Roll Forward]    
Goodwill 324,000,000 324,000,000
Progress Energy [Member]    
Goodwill [Roll Forward]    
Goodwill 3,655,000,000 3,655,000,000
Accumulated impairment charges 0 0
Piedmont Natural Gas [Member]    
Goodwill [Roll Forward]    
Goodwill 49,000,000 49,000,000
Accumulated impairment charges $ 0 $ 0