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Fair Value Measurements (Quantitative Level 3 Fair Value Disclosures) (Details) $ in Millions | Sep. 30, 2023 USD ($) $ / MWh | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / MWh | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | --- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 30 | $ 41 | $ 34 | $ 60 | $ 89 | $ 24
Duke Energy Ohio | FTRs | RTO auction pricing |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 3 |  | $ 5 |  |  |
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) | 0.43 |  | 0.89 |  |  |
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) | 2.07 |  | 6.25 |  |  |
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) | 0.77 |  | 3.35 |  |  |
Duke Energy Indiana |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 27 | $ 37 | $ 29 | $ 56 | $ 84 | $ 22
Duke Energy Indiana | FTRs | RTO auction pricing |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 27 |  | $ 29 |  |  |
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) | (1.64) |  | 0.09 |  |  |
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) | 12.51 |  | 21.79 |  |  |
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) | 1.90 |  | 2.74 |  |  |

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