v3.26.1
Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation $ 95 $ 72
Duke Energy Carolinas    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 36 36
Progress Energy    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 31 20
Duke Energy Progress    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 11 10
Duke Energy Florida    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 20 10
Duke Energy Ohio    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 23 12
Duke Energy Indiana    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation 2 2
Piedmont    
Environmental Matters Details [Line Items]    
Reserves for Environmental Remediation $ 2 $ 2