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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) - Duke Energy Ohio - USD ($) $ in Millions | Apr. 01, 2024 | Oct. 12, 2023 | Apr. 28, 2023 | Dec. 01, 2022 | Sep. 19, 2022 | Jul. 14, 2022 | Oct. 01, 2021
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Duke Energy Ohio Electric Base Rate Case | PUCO |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 23 |  | $ 55
Requested return on equity (as a percent) |  |  |  |  | 9.50% |  |
Equity ratio (as a percent) |  |  |  |  | 50.50% |  |
Duke Energy Ohio Gas Base Rate Case | PUCO |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 32 |  |  | $ 49 |
Requested return on equity (as a percent) |  |  | 9.60% |  |  |  |
Duke Energy Ohio Gas Base Rate Case | PUCO | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Equity ratio (as a percent) |  |  | 52.32% |  |  |  |
Duke Energy Kentucky Electric Base Rate Case | KPSC |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 75 |  |  |
Approved rate increase (decrease), amount |  | $ 48 |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case | KPSC | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Equity ratio (as a percent) |  | 52.145% |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case, Electric Riders | KPSC |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  | 9.65% |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case, Electric Base Rates | KPSC |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  | 9.75% |  |  |  |  |
Duke Energy Ohio Energy Security Plan | PUCO |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Settlement rate, period (in years) | 3 years |  |  |  |  |  |

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