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Fair Value Measurements (Quantitative Level 3 Fair Value Disclosures) (Details) $ in Millions | Mar. 31, 2024 USD ($) $ / MWh | Dec. 31, 2023 USD ($) $ / MWh | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Net derivative asset (liability) | $ | $ 6 | $ 15 | $ 12 | $ 34
Duke Energy Ohio | FTRs | RTO auction pricing |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Net derivative asset (liability) | $ | $ 1 | $ 2 |  |
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) | 0.17 | 0.36 |  |
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) | 2.13 | 2.11 |  |
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) | 0.49 | 0.71 |  |
Duke Energy Indiana |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Net derivative asset (liability) | $ | $ 5 | $ 13 | $ 11 | $ 29
Duke Energy Indiana | FTRs | RTO auction pricing |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Net derivative asset (liability) | $ | $ 5 | $ 13 |  |
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) | 0 | (1.05) |  |
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) | 8.95 | 9.64 |  |
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) | 1.45 | 1.26 |  |

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