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Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation $ 90 $ 84
Duke Energy Carolinas    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 24 22
Progress Energy    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 20 19
Duke Energy Progress    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 10 8
Duke Energy Florida    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 10 11
Duke Energy Ohio    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 36 33
Duke Energy Indiana    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 2 3
Piedmont    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation $ 7 $ 7