XML 121 R67.htm IDEA: XBRL DOCUMENT v3.21.1
Goodwill (Narrative) (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Goodwill [Line Items]    
Goodwill $ 19,303,000,000 $ 19,303,000,000
Accumulated impairment charges 122,000,000 122,000,000
Electric Utilities and Infrastructure    
Goodwill [Line Items]    
Goodwill 17,379,000,000 17,379,000,000
Accumulated impairment charges 0 0
Gas Utilities and Infrastructure    
Goodwill [Line Items]    
Goodwill 1,924,000,000 1,924,000,000
Accumulated impairment charges 0 0
Duke Energy Ohio    
Goodwill [Line Items]    
Goodwill 920,000,000 920,000,000
Accumulated impairment charges 216,000,000 216,000,000
Duke Energy Ohio | Electric Utilities and Infrastructure    
Goodwill [Line Items]    
Goodwill 596,000,000 596,000,000
Duke Energy Ohio | Gas Utilities and Infrastructure    
Goodwill [Line Items]    
Goodwill 324,000,000 324,000,000
Progress Energy    
Goodwill [Line Items]    
Goodwill 3,655,000,000 3,655,000,000
Progress Energy | Electric Utilities and Infrastructure    
Goodwill [Line Items]    
Accumulated impairment charges 0 0
Piedmont    
Goodwill [Line Items]    
Goodwill 49,000,000 49,000,000
Piedmont | Gas Utilities and Infrastructure    
Goodwill [Line Items]    
Accumulated impairment charges $ 0 $ 0