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TAXES - Changes in Valuation Allowances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Loss Carry Forward Valuation Reserve |  |  |
Beginning of year balance | $ 226 | $ 440 | $ 484
Charged to income | 14 | (214) | (44)
Charged to other accounts | 0 | 0 | 0
Write-offs | 0 | 0 | 0
End of year balance | $ 240 | $ 226 | $ 440

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- Definition Deferred Tax Assets Liabilities Net Non current Loss carry forward valuation reserve. + References No definition available. + Details
Name: | fe_DeferredTaxAssetsLiabilitiesNetNonCurrentLossCarryForwardValuationReserve
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Loss Carry Forward Valuation Reserve + References No definition available. + Details
Name: | fe_LossCarryForwardValuationReserveRollForward
Namespace Prefix: | fe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating Loss Carryforward, Valuation Allowance Reserve, Charged To Income + References No definition available. + Details
Name: | fe_OperatingLossCarryforwardValuationAllowanceReserveChargedToIncome
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Operating Loss Carryfroward, Valuation Allowance Reserve, Charged To Other Accounts + References No definition available. + Details
Name: | fe_OperatingLossCarryfrowardValuationAllowanceReserveChargedToOtherAccounts
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Operating Loss Carryfroward, Valuation Allowance Reserve, Written-Off + References No definition available. + Details
Name: | fe_OperatingLossCarryfrowardValuationAllowanceReserveWrittenOff
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration