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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) - USD ($) $ in Millions |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 28, 2023 | Mar. 10, 2023 | Dec. 01, 2022 | Sep. 19, 2022 | Oct. 01, 2021 | Mar. 31, 2023 | Mar. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  | $ 7,276 | $ 7,011
Operation, maintenance and other |  |  |  |  |  | 1,310 | 1,548
Income Tax Expense From Continuing Operations |  |  |  |  |  | (155) | (25)
Duke Energy Ohio |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  | 709 | 638
Operation, maintenance and other |  |  |  |  |  | 123 | 178
Income Tax Expense From Continuing Operations |  |  |  |  |  | (20) | $ 56
Duke Energy Ohio Electric Base Rate Case | PUCO | Duke Energy Ohio |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 23 | $ 55 |  |
Requested return on equity (as a percent) |  |  |  | 9.50% | 10.30% |  |
Duke Energy Ohio Gas Base Rate Case | PUCO | Duke Energy Ohio |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 49 |
Requested return on equity (as a percent) |  |  |  |  |  | 10.30% |
Requested rate increase, percentage |  |  |  |  |  | 5.60% |
Duke Energy Ohio Gas Base Rate Case | PUCO | Duke Energy Ohio | Subsequent event |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 32 |  |  |  |  |  |
Requested return on equity (as a percent) | 9.60% |  |  |  |  |  |
Duke Energy Ohio Gas Base Rate Case | PUCO | Duke Energy Ohio | 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 | Duke Energy Ohio | 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% |
Duke Energy Ohio Gas Base Rate Case | PUCO | Duke Energy Ohio | Maximum | Subsequent event |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Equity ratio (as a percent) | 52.32% |  |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Ohio |  |  |  |  |  |  |
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, percentage |  |  |  |  |  | 17.80% |

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