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Fair Value Measurements (Quantitative Level 3 Fair Value Disclosure) (Details) $ in Millions | Dec. 31, 2021 USD ($) $ / MWh | Dec. 31, 2020 USD ($) $ / MWh | Dec. 31, 2019 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Net derivative asset (liability) | $ | $ (121) | $ (77) | $ (102)
Forward natural gas curves – price per MMBtu | Discounted cash flow |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Net derivative asset (liability) | $ |  | $ (84) |
Forward natural gas curves – price per MMBtu | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Net derivative asset (liability) | $ | $ (145) |  |
Forward natural gas curves – price per MMBtu | Minimum | Discounted cash flow |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) |  | 14.68 |
Forward natural gas curves – price per MMBtu | Minimum | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) | 19.04 |  |
Forward natural gas curves – price per MMBtu | Maximum | Discounted cash flow |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) |  | 151.84 |
Forward natural gas curves – price per MMBtu | Maximum | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) | 139.11 |  |
Forward natural gas curves – price per MMBtu | Weighted Average | Discounted cash flow |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) |  | 28.84 |
Forward natural gas curves – price per MMBtu | Weighted Average | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) | 37.57 |  |
Duke Energy Ohio | FTR price – per MWh | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Net derivative asset (liability) | $ | $ 2 | $ 1 |
Duke Energy Ohio | FTR price – per MWh | Minimum | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) | 0.06 | 0.25 |
Duke Energy Ohio | FTR price – per MWh | Maximum | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) | 1.79 | 1.68 |
Duke Energy Ohio | FTR price – per MWh | Weighted Average | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) | 0.96 | 0.79 |
Duke Energy Indiana |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Net derivative asset (liability) | $ | $ 22 | $ 6 | $ 11
Duke Energy Indiana | FTR price – per MWh | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Net derivative asset (liability) | $ | $ 22 | $ 6 |
Duke Energy Indiana | FTR price – per MWh | Minimum | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) | (1.18) | (2.40) |
Duke Energy Indiana | FTR price – per MWh | Maximum | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) | 13.11 | 7.41 |
Duke Energy Indiana | FTR price – per MWh | Weighted Average | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input measurement (in usd per MWh and usd per MMBtu) | 2.68 | 1.05 |

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