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Related Party Transactions (Intercompany Income Taxes) (Details) - Related Party - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | $ 81 | $ 419
Progress Energy |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 72 | 169
Duke Energy Progress |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 77 | 315
Duke Energy Florida |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 154
Intercompany income tax payable | 12 |
Duke Energy Ohio |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 10 | 43
Duke Energy Indiana |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 39 | 110
Piedmont |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | $ 59 | $ 43

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