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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Tax Credit Carryforward [Line Items] |  |  |
Tax credits | $ 643 |  |
Other current assets |  | $ 984 | $ 695
Duke Energy Carolinas |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Other current assets |  | 433 | 52
Duke Energy Carolinas | Sale of Nuclear Power PTCs |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Decrease in deferred tax asset | 478 |  |
Other current assets |  | 382 |
Duke Energy Progress |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Other current assets |  | 208 | 104
Duke Energy Progress | Sale of Nuclear Power PTCs |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Decrease in deferred tax asset | 69 |  |
Duke Energy Florida |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Other current assets |  | $ 57 | $ 227
Duke Energy Florida | Sale of Nuclear Power PTCs |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Decrease in deferred tax asset | $ 58 |  |

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