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Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - Environmental reserves - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]    
Reserves for Environmental Remediation $ 72 $ 68
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other Other
Duke Energy Carolinas    
Loss Contingencies [Line Items]    
Reserves for Environmental Remediation $ 36 $ 24
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other Other
Progress Energy    
Loss Contingencies [Line Items]    
Reserves for Environmental Remediation $ 20 $ 19
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other Other
Duke Energy Progress    
Loss Contingencies [Line Items]    
Reserves for Environmental Remediation $ 10 $ 9
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other Other
Duke Energy Florida    
Loss Contingencies [Line Items]    
Reserves for Environmental Remediation $ 10 $ 10
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other Other
Duke Energy Ohio    
Loss Contingencies [Line Items]    
Reserves for Environmental Remediation $ 12 $ 21
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other Other
Duke Energy Indiana    
Loss Contingencies [Line Items]    
Reserves for Environmental Remediation $ 2 $ 2
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other Other
Piedmont    
Loss Contingencies [Line Items]    
Reserves for Environmental Remediation $ 2 $ 2
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other Other