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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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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

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