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Related Party Transactions (Intercompany Income Taxes) (Details) - Related Party - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | $ 81 | $ 37
Progress Energy |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 95
Intercompany income tax payable | 92 |
Duke Energy Progress |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 36
Intercompany income tax payable | 94 |
Duke Energy Florida |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 17
Intercompany income tax payable | 114 |
Duke Energy Ohio |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 91 |
Intercompany income tax payable |  | 17
Duke Energy Indiana |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 53 |
Intercompany income tax payable |  | 18
Piedmont |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | $ 57 | $ 38

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