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Fair Value Measurements (Quantitative Level 3 Fair Value Disclosures) (Details) $ in Millions | Mar. 31, 2022 USD ($) $ / MWh | Dec. 31, 2021 USD ($) $ / MWh | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Net derivative asset (liability) | $ | $ (199) | $ (121) | $ (126) | $ (77)
Electricity contracts | RTO auction pricing |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Net derivative asset (liability) | $ | $ (210) | $ (145) |  |
Electricity contracts | RTO auction pricing | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | 20.33 | 19.04 |  |
Electricity contracts | RTO auction pricing | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | 187.82 | 139.11 |  |
Electricity contracts | RTO auction pricing | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | 46.51 | 37,570,000 |  |
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) | 0.16 | 0.06 |  |
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) | 1.26 | 1.79 |  |
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) | 0.63 | 0.96 |  |
Duke Energy Indiana |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Net derivative asset (liability) | $ | $ 10 | $ 22 | $ 2 | $ 6
Duke Energy Indiana | FTRs | RTO auction pricing |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Net derivative asset (liability) | $ | $ 10 | $ 22 |  |
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) | (0.46) | (1.18) |  |
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) | 17.24 | 13.11 |  |
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) | 2.32 | 2.68 |  |

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