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SEGMENT INFORMATION - Narrative (Details) mi² in Thousands, $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 02, 2023 USD ($) | May 31, 2022 USD ($) | Mar. 05, 2021 USD ($) | Apr. 06, 2020 | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) mi² company customer MW | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gain on sale of property |  |  |  |  |  | $ 0 | $ 109 | $ 0
DiscontinuedOperationGainLossOnDisposalStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag |  |  |  |  | TMI-2 to TMI-2 Solutions |  |  |
Brookfield II | FET | Subsequent Event |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sale of ownership interest by parent | 30.00% |  |  |  |  |  |  |
Noncontrolling interest ownership percentage | 49.90% |  |  |  |  |  |  |
FET | Brookfield II |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sale of ownership interest by parent |  | 19.90% |  |  |  |  |  |
Sale of ownership interest by parent |  | $ 2,375 |  |  |  |  |  |
FET | Brookfield II | Subsequent Event |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Consideration | $ 3,500 |  |  |  |  |  |  |
Liabilities incurred | $ 1,750 |  |  |  |  |  |  |
JCP&L | New Jersey | Yard's Creek Energy, LLC Hydro Generation Facility | NJBPU |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, ownership interest sold |  |  |  | 50.00% |  |  |  |
Regulated Distribution |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Number of existing utility operating companies | company |  |  |  |  |  | 10 |  |
Number of customers served by utility operating companies | customer |  |  |  |  |  | 6,000,000 |  |
Number of square miles in service area | mi² |  |  |  |  |  | 65 |  |
Megawatts of net demonstrated capacity of competitive segment (in MW's) | MW |  |  |  |  |  | 3,580 |  |
Regulated Distribution | Disposal Group, Disposed of by Sale | TMI-2 |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gain on disposal of discontinued operation, net of tax |  |  |  |  | $ 33 |  |  |
Regulated Distribution | JCP&L | New Jersey | Yard's Creek Energy, LLC Hydro Generation Facility |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gain on sale of property |  |  | $ 109 |  |  |  |  |
Other/Corporate | OVEC |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Megawatts of net demonstrated capacity of competitive segment (in MW's) | MW |  |  |  |  |  | 67 |  |
FE | Subsequent Event | FET |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Ownership interest | 50.10% |  |  |  |  |  |  |
FE | Other/Corporate |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Long-term debt and other long-term obligations |  |  |  |  |  | $ 5,400 |  |

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