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SEGMENT INFORMATION - Narrative (Details) customer in Millions, $ in Millions |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 16, 2025 USD ($) | Sep. 30, 2025 USD ($) customer site MW | Dec. 31, 2025 site MW | Dec. 31, 2024 USD ($) site MW | Jul. 31, 2025
Segment Reporting Information [Line Items] |  |  |  |  |
Number of customers | customer |  | 6.0 |  |  |
Global Holding |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Equity method investments | $ |  |  |  | $ 45.0 |
FEV | Global Holding |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment ownership percentage | 33.33% |  |  |  | 33.33%
Ownership percentage sold | 0.3333 |  |  |  |
Equity method investments | $ |  | $ 47.5 |  |  |
Proceeds from investments sold | $ | $ 47.5 |  |  |  |
JERSEY CENTRAL POWER & LIGHT COMPANY |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of customers | customer |  | 1.2 |  |  |
Distribution Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of customers | customer |  | 4.3 |  |  |
Distribution Segment | JERSEY CENTRAL POWER & LIGHT COMPANY |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of customers | customer |  | 1.2 |  |  |
Integrated Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of customers | customer |  | 2.0 |  |  |
Plant capacity (in MW's) | MW |  | 3,610 |  |  |
Other Business Operations | FE |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Long-term debt | $ |  | $ 7,100.0 |  |  |
Other Business Operations | OVEC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Plant capacity (in MW's) | MW |  | 67 |  |  |
Integrated | MP and PE | Solar Generation Project |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Plant capacity (in MW's) | MW |  | 50 |  |  |
Number of approved solar sites | site |  | 5 |  |  |
Number of completed solar sites | site |  | 3 |  | 3 |
Integrated | MP and PE | Solar Generation Project | Forecast |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Plant capacity (in MW's) | MW |  |  | 20 |  |
Number of sites expected to be completed | site |  |  | 2 |  |
Integrated | MP and PE | Solar Generation Project | West Virginia |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  | 30 |

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