Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated entity - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Duke Energy Carolinas
Related Party Transaction [Line Items]
Intercompany income tax payable	$ 37	$ 62
Progress Energy
Related Party Transaction [Line Items]
Intercompany income tax receivable	95
Duke Energy Progress
Related Party Transaction [Line Items]
Intercompany income tax receivable	36
Intercompany income tax payable		84
Duke Energy Florida
Related Party Transaction [Line Items]
Intercompany income tax receivable	17	40
Duke Energy Ohio
Related Party Transaction [Line Items]
Intercompany income tax receivable		19
Intercompany income tax payable	17
Duke Energy Indiana
Related Party Transaction [Line Items]
Intercompany income tax payable	18	10
Piedmont
Related Party Transaction [Line Items]
Intercompany income tax payable	$ 38	$ 27