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Summary of Significant Accounting Policies (Other Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Duke Energy Carolinas | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Accrued compensation $ 302 $ 234
Progress Energy | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Customer deposits/Collateral liabilities 293 281
Duke Energy Progress | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Accrued compensation 143 114
Duke Energy Florida | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Customer deposits/Collateral liabilities 191 164
Duke Energy Florida | Current Assets    
Organization And Basis Of Presentation [Line Items]    
Tax receivables 12 166
Duke Energy Indiana | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Customer advances $ 117 $ 100