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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) - USD ($) $ in Millions |  |  |  |  |  | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 03, 2026 | Oct. 02, 2025 | Jun. 02, 2025 | May 15, 2024 | Oct. 12, 2023 | Dec. 31, 2024 | Apr. 30, 2024 | Apr. 30, 2023 | Sep. 30, 2025
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  | $ 1,421 |  |  | $ 1,229
Duke Energy Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  | 34 |  |  | 54
Duke Energy Ohio Gas Base Rate Case | PUCO | Duke Energy Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  | $ 32 |
Equity ratio (as a percent) |  |  |  |  |  |  |  | 52.32% |
Requested return on equity (as a percent) |  |  |  |  |  |  |  | 9.60% |
Duke Energy Ohio Energy Security Plan | PUCO | Duke Energy Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Settlement rate, period (in years) |  |  |  | 3 years |  |  | 3 years |  |
Regulatory assets |  |  |  |  |  | 30 |  |  | 0
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  |  |  |  | 52.145% |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  | $ 48 |  |  |  |
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Kentucky |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  |  |  |  | $ 7
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Kentucky | Subsequent event |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  | 52.73% |  |  |  |  |  |  |
Refund period |  | 60 days |  |  |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case, Electric Base Rates | KPSC | Duke Energy Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  |  | 9.75% |  |  |  |
Duke Energy Kentucky Electric Base Rate Case, Electric Base Rates | KPSC | Duke Energy Kentucky | Subsequent event |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  | 9.80% |  |  |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case, Electric Riders | KPSC | Duke Energy Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  |  | 9.65% |  |  |  |
Duke Energy Kentucky 2024 Electric Base Rate Case | KPSC | Duke Energy Kentucky |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 70 |  |  |
Duke Energy Kentucky 2025 Natural Gas Base Rate Case | KPSC | Duke Energy Kentucky |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 26 |  |  |  |  |  |
Equity ratio (as a percent) |  |  | 52.649% |  |  |  |  |  |
Requested return on equity (as a percent) |  |  | 10.75% |  |  |  |  |  |
Requested rate increase, percentage, net of tax |  |  | 17.00% |  |  |  |  |  |
Duke Energy Kentucky 2025 Natural Gas Base Rate Case | KPSC | Duke Energy Kentucky | Subsequent event |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  | $ 44 |  |  |  |  |  |  |
Duke Energy Kentucky 2025 Natural Gas Base Rate Case | KPSC | Duke Energy Kentucky | Subsequent event | Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) | 52.649% |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount | $ 22 |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) | 9.80% |  |  |  |  |  |  |  |
Duke Energy Kentucky 2025 Natural Gas Base Rate Case, Riders | KPSC | Duke Energy Kentucky | Subsequent event | Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) | 9.70% |  |  |  |  |  |  |  |

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