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RATE MATTERS - KPCo Rate Matters (Details) - 2023 Kentucky Base Rate and Securitization Case - KPCo - USD ($) $ in Millions | 1 Months Ended
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Mar. 31, 2025 | Jan. 31, 2025 | Feb. 26, 2024 | Jan. 31, 2024 | Nov. 30, 2023 | Jun. 30, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested annual increase |  |  |  |  |  | $ 94
Requested return on equity |  |  |  |  |  | 9.90%
Requested securitization bonds regulatory assets recovery |  |  |  |  |  | $ 471
Kpco interest in mitchell plant |  |  |  |  |  | 50.00%
Net book value | $ 542 |  |  |  |  |
Settlement agreement annual increase |  |  |  |  | $ 75 |
Settlement agreement return on common equity |  |  |  |  | 9.75% |
Settlement agreement securitization bonds regulatory assets recovery |  |  |  |  | $ 471 |
Approved net increase in Kentucky annual revenues |  |  |  | $ 60 |  |
Approved return on equity |  |  |  | 9.75% |  |
Reduction in revenue requirement for recovery of actual test year pjm transmission costs |  | $ 14 | $ 14 | $ 14 |  |
Order entered in mandated period |  | 30 days |  |  |  |
Request to defer transmission costs, amount denied | 16 |  |  |  |  |
Regulatory assets expected to be recovered through securitization |  |  |  | 495 |  |
Securitized plant retirement costs |  |  |  | 307 |  |
Securitized deferred storm costs |  |  |  | $ 79 |  |
Securitized purchased power expenses | 50 |  |  |  |  |
Securitized under recovered rider costs | 56 |  |  |  |  |
Securitized deferred issuance related expenses | $ 3 |  |  |  |  |

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