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Segment Information - Narrative (Details) mi² in Thousands, customer in Millions, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
May 31, 2022 USD ($) | Mar. 05, 2021 USD ($) | Apr. 06, 2020 | Jun. 30, 2022 USD ($) mi² company MW | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) mi² customer company MW | Jun. 30, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain on sale of Yards Creek (Note 9) |  |  |  | $ 0 | $ 0 | $ 0 | $ 109
FET | North American Transmission Company II LLC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Sale of ownership interest by parent | 19.90% |  |  |  |  |  |
Sale price of ownership interest by parent | $ 2,375 |  |  |  |  |  |
JCP&L | Yard's Creek Energy | NEW JERSEY | NJBPU |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Ownership interest sold |  |  | 50.00% |  |  |  |
Regulated Distribution |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of existing utility operating companies | company |  |  |  | 10 |  | 10 |
Number of customers served by utility operating companies | customer |  |  |  |  |  | 6 |
Number of square miles in service area | mi² |  |  |  | 65 |  | 65 |
Megawatts of net demonstrated capacity of competitive segment | MW |  |  |  | 3,580 |  | 3,580 |
Regulated Distribution | JCP&L | Yard's Creek Energy | NEW JERSEY |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain on sale of Yards Creek (Note 9) |  | $ 109 |  |  |  |  |
Other/Corporate | OVEC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Megawatts of net demonstrated capacity of competitive segment | MW |  |  |  | 67 |  | 67 |
FirstEnergy | Other/Corporate |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Long-term debt and other long-term obligations |  |  |  | $ 5,500 |  | $ 5,500 |

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