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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 09, 2022 USD ($) | Jul. 21, 2021 USD ($) | Oct. 29, 2020 USD ($) review | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Nov. 30, 2021 USD ($)
Guarantor Obligations [Line Items] |  |  |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  |  | $ 815,000 |  |
Company posted collateral related to net liability positions |  |  |  | 89,000 |  |
Collateral received |  |  |  | $ 27,000 |  |
Percent of face amount of debt |  |  |  | 100.00% |  |
Curing period |  |  |  | 30 days |  |
Environmental loss contingency statement of financial position extensible enumeration not disclosed flag |  |  |  | Environmental liabilities |  |
Civil penalty |  |  | $ 3,860 |  |  |
Number of compliance reviews | review |  |  | 2 |  |  |
Climate change |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  |  | 30.00% |  |
Chief Executive Officer | Code of Conduct Violation, Recoupment Amount |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Proposed penalty |  |  |  |  |  | $ 56,000
United States v. Householder, et al. | U.S. Attorney's Office |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Term of DPA |  | 3 years |  |  |  |
Loss in period |  | $ 230,000 |  |  |  |
Term of payments |  | 60 days |  |  |  |
United States v. Householder, et al. | United States Treasury |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Proposed penalty |  | $ 115,000 |  |  |  |
United States v. Householder, et al. | Ohio Development Service |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Proposed penalty |  | $ 115,000 |  |  |  |
Smith v FirstEnergy Corp et al., Buldas v FirstEnergy Corp. et al., and Hudock and Cameo Countertops, Inc. v. FirstEnergy Corp. et al. |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Loss contingency accrual |  |  |  |  | $ 37,500 |
Emmons v. FirstEnergy Corp. et al. |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Loss contingency accrual |  |  |  |  | $ 37,500 |
Shareholder Derivative Lawsuit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Proposed penalty | $ 36,000 |  |  |  |  |
Settlement payment awarded | $ 180,000 |  |  |  |  |
Regulation of Waste Disposal |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | $ 96,000 |  |
Environmental liabilities former gas facilities |  |  |  | $ 75,000 |  |
Surety Bonds (collateralized amount) |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Percent of face amount of debt |  |  |  | 60.00% |  |
Capped portion of surety bond obligations |  |  |  | $ 39,000 |  |
FE |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  |  | 515,000 |  |
Other Assurances |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  |  | $ 300,000 |  |

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