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Commitments and Contingencies (Narrative) (Details) $ in Millions | Dec. 20, 2024 plaintiff | Sep. 30, 2025 USD ($) | Jul. 31, 2025 | Dec. 31, 2024 USD ($)
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Mooresville Coal Ash Class Action Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of plaintiffs | plaintiff | 15 |  |  |
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Asbestos-related injuries and damages reserves |  | $ 404 |  | $ 396
Probable insurance recoveries |  | 557 |  | 539
Duke Energy and Duke Energy Carolinas |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reserve for credit losses for insurance receivables |  | $ 9 |  | $ 9
Duke Energy Indiana |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Settlement disbursement period |  |  | 1 year |

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