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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Duke Energy Carolinas    
Related Party Transaction [Line Items]    
Intercompany income tax receivable $ 17  
Intercompany income tax payable   $ 62
Progress Energy    
Related Party Transaction [Line Items]    
Intercompany income tax payable 22  
Duke Energy Progress    
Related Party Transaction [Line Items]    
Intercompany income tax payable 29 84
Duke Energy Florida    
Related Party Transaction [Line Items]    
Intercompany income tax receivable   40
Intercompany income tax payable 54  
Duke Energy Ohio    
Related Party Transaction [Line Items]    
Intercompany income tax receivable 2 19
Duke Energy Indiana    
Related Party Transaction [Line Items]    
Intercompany income tax payable 17 10
Piedmont    
Related Party Transaction [Line Items]    
Intercompany income tax receivable $ 19  
Intercompany income tax payable   $ 27