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Fair Value Measurements (Quantitative Level 3 Fair Value Disclosures) (Details) $ in Millions | Sep. 30, 2025 USD ($) $ / MWh | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) $ / MWh | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 12 | $ 14 | $ 9 | $ 17 | $ 35 | $ 15
Duke Energy Ohio | FTRs | RTO auction pricing |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 1 |  | $ 1 |  |  |
Duke Energy Ohio | FTRs | RTO auction pricing | Minimum |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | 0 |  | 0 |  |  |
Duke Energy Ohio | FTRs | RTO auction pricing | Maximum |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | 1.14 |  | 1.13 |  |  |
Duke Energy Ohio | FTRs | RTO auction pricing | Weighted Average |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | 0.22 |  | 0.48 |  |  |
Duke Energy Indiana |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 11 | $ 13 | $ 8 | $ 15 | $ 33 | $ 13
Duke Energy Indiana | FTRs | RTO auction pricing |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 11 |  | $ 8 |  |  |
Duke Energy Indiana | FTRs | RTO auction pricing | Minimum |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | (2.13) |  | (0.63) |  |  |
Duke Energy Indiana | FTRs | RTO auction pricing | Maximum |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | 12.29 |  | 9.24 |  |  |
Duke Energy Indiana | FTRs | RTO auction pricing | Weighted Average |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | 1.01 |  | 0.94 |  |  |

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