Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Duke Energy Carolinas
Related Party Transaction [Line Items]
Intercompany income tax payable		$ 37
Progress Energy
Related Party Transaction [Line Items]
Intercompany income tax receivable	$ 21	95
Duke Energy Progress
Related Party Transaction [Line Items]
Intercompany income tax receivable		36
Intercompany income tax payable	2
Duke Energy Florida
Related Party Transaction [Line Items]
Intercompany income tax receivable		17
Intercompany income tax payable	30
Duke Energy Ohio
Related Party Transaction [Line Items]
Intercompany income tax payable	15	17
Duke Energy Indiana
Related Party Transaction [Line Items]
Intercompany income tax payable	24	18
Piedmont
Related Party Transaction [Line Items]
Intercompany income tax payable	$ 38	$ 38