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SEGMENT INFORMATION - Narrative (Details) mi² in Thousands, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 02, 2023 USD ($) | Dec. 31, 2023 USD ($) mi² customer MW | Jan. 01, 2024 | Apr. 27, 2023 USD ($) | May 31, 2022
FET |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Noncontrolling interest ownership percentage | 49.90% | 19.90% |  |  |
Brookfield II | FET |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sale of ownership interest by parent | 30.00% |  |  | 30.00% |
Noncontrolling interest ownership percentage | 49.90% |  |  |  |
FE | FET |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 50.10% |  |  |  |
FET | Brookfield II |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sale of ownership interest by parent |  | 19.90% |  |  | 19.90%
Consideration | $ 3,500 |  |  | $ 3,500 |
Liabilities incurred | $ 1,750 |  |  |  |
FEV | Global Holding |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment ownership percentage |  | 33.33% |  |  |
FEV | Global Holding | Subsequent Event |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment ownership percentage |  |  | 33.33% |  |
Utilities and Transmission Companies |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of customers | customer |  | 6,000,000 |  |  |
Service Area | mi² |  | 65 |  |  |
Plant generation capacity (in MW's) | MW |  | 3,580 |  |  |
Other Business Operations [Member] | FE |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Long-term debt and other long-term obligations |  | $ 7,100 |  |  |
Other Business Operations [Member] | OVEC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Plant generation capacity (in MW's) | MW |  | 67 |  |  |

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