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Fair Value Measurements (Quantitative Level 3 Fair Value Disclosure) (Details) $ in Millions | Dec. 31, 2023 USD ($) $ / MWh | Dec. 31, 2022 USD ($) $ / MWh | Dec. 31, 2021 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ | $ 15 | $ 34 | $ 24
Duke Energy Ohio | FTR price – per MWh | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ | $ 2 | $ 5 |
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) | 0.36 | 0.89 |
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) | 2.11 | 6.25 |
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) | 0.71 | 3.35 |
Duke Energy Indiana |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ | $ 13 | $ 29 | $ 22
Duke Energy Indiana | FTR price – per MWh | RTO auction pricing |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ | $ 13 | $ 29 |
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) | (1.05) | 0.09 |
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) | 9.64 | 21.79 |
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) | 1.26 | 2.74 |

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