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RATE MATTERS - 2025 Ohio Base Rate Case (Details) - OPCo - USD ($) $ in Millions | 1 Months Ended
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Oct. 29, 2025 | May 31, 2025
2025 Ohio Base Rate Case |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested annual base rate increase (decrease) |  | $ 97
Requested return on equity |  | 10.90%
Requested debt capital structure |  | 49.10%
Requested equity capital structure |  | 50.90%
2025 Ohio Base Rate Case | Subsequent Event |  |
Public Utilities, General Disclosures [Line Items] |  |
Recommended exclusion of investments from rate base | $ 59 |
Recommended exclusion of capitalized incentives | 55 |
Recommended reduction in employee related expenses | 23 |
2025 Ohio Base Rate Case | Minimum | Subsequent Event |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested annual base rate increase (decrease) | $ (12) |
Requested return on equity | 9.33% |
2025 Ohio Base Rate Case | Maximum | Subsequent Event |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested annual base rate increase (decrease) | $ (28) |
Requested return on equity | 9.84% |
Annual Rider Revenue Requirements |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested annual base rate increase (decrease) |  | $ 308

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