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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 28, 2023 | Apr. 03, 2023 | Mar. 10, 2023 | Dec. 01, 2022 | Sep. 19, 2022 | Oct. 01, 2021 | Dec. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  | $ 6,578 | $ 6,564 | $ 13,854 | $ 13,575 |
Operation, maintenance and other |  |  |  |  |  |  |  | 1,375 | 1,367 | 2,685 | 2,915 |
Income Tax Expense From Continuing Operations |  |  |  |  |  |  |  | (119) | (114) | (274) | (139) |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  | 589 | 545 | 1,298 | 1,183 |
Operation, maintenance and other |  |  |  |  |  |  |  | 121 | 109 | 244 | 287 |
Income Tax Expense From Continuing Operations |  |  |  |  |  |  |  | $ (13) | $ (9) | $ (33) | $ 47 |
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 | $ 32 | $ 49 |  |  |  |  |  |  |  |  |  |
Requested return on equity (as a percent) | 9.60% | 10.30% |  |  |  |  |  |  |  |  |  |
Requested rate increase, percentage |  | 5.60% |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  | 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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