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Related Party Transactions (Intercompany Income Taxes) (Details) - Related Party - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | $ 0 | $ 0
Intercompany income tax payable | 85 | 419
Progress Energy |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 0 | 0
Intercompany income tax payable | 119 | 169
Duke Energy Progress |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 16 | 0
Intercompany income tax payable | 0 | 315
Duke Energy Florida |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 0 | 154
Intercompany income tax payable | 153 | 0
Duke Energy Ohio |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 0 | 0
Intercompany income tax payable | 15 | 43
Duke Energy Indiana |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 0 | 0
Intercompany income tax payable | 27 | 110
Piedmont |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 45 | 0
Intercompany income tax payable | $ 0 | $ 43

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