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Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts $ 314 $ 296
Total intangible assets, net 291 277
Emission allowances    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 8 8
Renewable energy certificates    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 259 241
Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 47 47
Accumulated amortization (23) (19)
Duke Energy Carolinas    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 115 103
Total intangible assets, net 115 103
Duke Energy Carolinas | Renewable energy certificates    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 115 103
Progress Energy    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 153 146
Total intangible assets, net 149 143
Progress Energy | Emission allowances    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 5 5
Progress Energy | Renewable energy certificates    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 143 136
Progress Energy | Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 5 5
Accumulated amortization (4) (3)
Duke Energy Progress    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 146 139
Total intangible assets, net 146 139
Duke Energy Progress | Emission allowances    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 2 2
Duke Energy Progress | Renewable energy certificates    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 143 136
Duke Energy Progress | Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 1 1
Duke Energy Florida    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 7 7
Total intangible assets, net 3 4
Duke Energy Florida | Emission allowances    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 3 3
Duke Energy Florida | Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 4 4
Accumulated amortization (4) (3)
Duke Energy Ohio    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 1 2
Total intangible assets, net 1 2
Duke Energy Ohio | Renewable energy certificates    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 1 2
Duke Energy Indiana    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 2 2
Total intangible assets, net 2 2
Duke Energy Indiana | Emission allowances    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 2 2
Piedmont    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 22 22
Total intangible assets, net 10 13
Piedmont | Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Total gross carrying amounts 22 22
Accumulated amortization $ (12) $ (9)