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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) - Duke Energy Ohio - USD ($) $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 12, 2023 | Apr. 28, 2023 | Apr. 03, 2023 | Mar. 10, 2023 | Dec. 01, 2022 | Sep. 19, 2022 | Oct. 01, 2021 | Dec. 31, 2022 | Sep. 30, 2023 | Dec. 31, 2022
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% | 10.30% |  |  |
Energy Efficiency Cost Recovery | PUCO |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 14 |
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% | 10.30% |  |  |  |  |  |  |
Requested rate increase (decrease) (as a percent) |  |  | 5.60% |  |  |  |  |  |  |
Duke Energy Ohio Gas Base Rate Case | PUCO | Minimum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  | $ 24
Requested return on equity (as a percent) |  |  |  |  |  |  |  |  |  | 9.03%
Duke Energy Ohio Gas Base Rate Case | PUCO | Maximum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  | $ 36
Requested return on equity (as a percent) |  |  |  |  |  |  |  |  |  | 10.04%
Equity ratio (as a percent) |  | 52.32% |  |  |  |  |  |  |  | 52.32%
Duke Energy Kentucky Electric Base Rate Case | KPSC |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 31 | $ 75 |  |  |  |  |
Requested return on equity (as a percent) |  |  |  | 9.55% | 10.35% |  |  |  |  |
Requested rate increase (decrease) (as a percent) |  |  |  |  |  |  |  | 17.80% |  |
Duke Energy Kentucky Electric Base Rate Case | KPSC | Subsequent event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount | $ 48 |  |  |  |  |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case | KPSC | Maximum | Subsequent event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) | 52.145% |  |  |  |  |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case, Electric Riders | KPSC | Subsequent event |  |  |  |  |  |  |  |  |  |
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 | Subsequent event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) | 9.75% |  |  |  |  |  |  |  |  |

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