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Summary of Significant Accounting Policies (Other Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Duke Energy Carolinas | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Accrued compensation $ 234 $ 224
Duke Energy Florida | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Customer deposits/Collateral liabilities 164 168
Duke Energy Florida | Current Assets    
Organization And Basis Of Presentation [Line Items]    
Tax receivables 166 12
Duke Energy Ohio | Current Assets    
Organization And Basis Of Presentation [Line Items]    
Tax receivables 4 95
Duke Energy Indiana | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Customer advances $ 100 $ 87