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Related Party Transactions (Intercompany Income Taxes) (Details) - Related Party - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Duke Energy Carolinas    
Related Party Transaction [Line Items]    
Intercompany income tax payable $ 419 $ 81
Progress Energy    
Related Party Transaction [Line Items]    
Intercompany income tax payable 169 92
Duke Energy Progress    
Related Party Transaction [Line Items]    
Intercompany income tax payable 315 94
Duke Energy Florida    
Related Party Transaction [Line Items]    
Intercompany income tax receivable 154  
Intercompany income tax payable   114
Duke Energy Ohio    
Related Party Transaction [Line Items]    
Intercompany income tax receivable   91
Intercompany income tax payable 43  
Duke Energy Indiana    
Related Party Transaction [Line Items]    
Intercompany income tax receivable   53
Intercompany income tax payable 110  
Piedmont    
Related Party Transaction [Line Items]    
Intercompany income tax payable $ 43 $ 57