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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Schedule of Potential Amount of Future Payments (Details) - USD ($) $ in Millions | Jul. 15, 2025 | Jun. 30, 2025
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Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | $ 1,062
JERSEY CENTRAL POWER & LIGHT COMPANY |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 48
FE's Guarantees on Behalf of its Consolidated Subsidiaries |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 616
FE’s Guarantees on Other Assurances |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 446
Deferred compensation arrangements | FE's Guarantees on Behalf of its Consolidated Subsidiaries |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 398
Deferred compensation arrangements | FE’s Guarantees on Other Assurances |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 94
Vehicle leases | FE's Guarantees on Behalf of its Consolidated Subsidiaries |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 75
McElroy Run transfer | FE's Guarantees on Behalf of its Consolidated Subsidiaries |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 129
Other | FE's Guarantees on Behalf of its Consolidated Subsidiaries |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 14
Surety Bonds |  |
Guarantor Obligations [Line Items] |  |
Capped portion of surety bond obligations |  | 38
Surety Bonds | Subsequent Event | Signal Peak |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations | $ 16 |
Surety Bonds | JERSEY CENTRAL POWER & LIGHT COMPANY |  |
Guarantor Obligations [Line Items] |  |
Capped portion of surety bond obligations |  | 1
Surety Bonds | FE’s Guarantees on Other Assurances |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 167
Surety Bonds | FE’s Guarantees on Other Assurances | JERSEY CENTRAL POWER & LIGHT COMPANY |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 20
LOCs | FE’s Guarantees on Other Assurances |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | 185
LOCs | FE’s Guarantees on Other Assurances | JERSEY CENTRAL POWER & LIGHT COMPANY |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations |  | $ 28

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