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Fair Value Measurements (Quantitative Level 3 Fair Value Disclosures) (Details) $ in Millions | Jun. 30, 2022 USD ($) $ / MWh | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) $ / MWh | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ (156) | $ (199) | $ (121) | $ (131) | $ (126) | $ (77)
Electricity contracts | RTO auction pricing |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ (245) |  | $ (145) |  |  |
Electricity contracts | RTO auction pricing | Minimum |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Input measurements (in usd per MWh and usd per MMBtu) | 23.35 |  | 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) | 243.21 |  | 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) | 53.28 |  | 37,570,000 |  |  |
Duke Energy Ohio | FTRs | RTO auction pricing |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 5 |  | $ 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) | (0.29) |  | 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) | 2.30 |  | 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) | 0.89 |  | 0.96 |  |  |
Duke Energy Indiana |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 84 | $ 10 | $ 22 | $ 22 | $ 2 | $ 6
Duke Energy Indiana | FTRs | RTO auction pricing |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |  |  |
Net derivative asset (liability) | $ | $ 84 |  | $ 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) | (0.61) |  | (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) | 24.34 |  | 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) | 3.69 |  | 2.68 |  |  |

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