<DefinitionAndReference>
  <Element Id="us-gaap_CashAcquiredFromAcquisition">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtAndCapitalLeaseObligations">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeAssetsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityFilerCategory">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccruedEmployeeBenefitsCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CommonStockExchangeRatio">
    <definition>Common stock exchange ratio.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LiabilitiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ProceedsFromSaleOfInvestmentsInAvailableForSaleSecuritiesRealizedGainsAndLossesOnThoseSalesAndInterestAndDividendIncomeTextBlock">
    <definition>Proceeds from sale of investments in available-for-sale securities, realized gains and losses on those sales, and interest and dividend income.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashAndCashEquivalentsAtCarryingValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockholdersEquity">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SuretyBondsAndRelatedGuarantees">
    <definition>Surety bonds and related guarantees.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_RevenueRequirement">
    <definition>Revenue requirement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurred">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InvestmentsInPowerAndDistributionProjects">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VolumeOfDerivativesPurchases">
    <definition>Volume Of Derivatives Purchases.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessCombinationDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ScheduleOfIntangibleAssetsTextBlock">
    <definition>Schedule of intangible assets.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_GainLossOnDerivatives">
    <definition>The gains and losses from increase (decrease) in fair value of derivatives included in earnings.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockSharesOutstanding">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EarningsPerShareBasic">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityIssuancesTotal">
    <definition>Fair value measurement with unobservable inputs reconciliation recurring basis asset and liability issuances total.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DeferredProjectedCost">
    <definition>Deferred projected cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VariableInterestEntitiesDiscountedLeasePaymentsNet">
    <definition>Discounted Lease Payments, net.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ChangeInConfidenceLevel">
    <definition>Change In Confidence Level.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_Assets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfVariableInterestEntitiesTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisRealizedGainLossTotal">
    <definition>Fair value measurement with unobservable inputs reconciliation recurring basis realized gain loss total.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EarningsPerShareTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLoss">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset unrealized gain loss.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_LoadCapPercentageMinimum">
    <definition>Load cap percentage minimum.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfProgramsForResidentialCustomers">
    <definition>Number of programs for residential customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SupplementalGuarantorInformationDisclosureTextBlock">
    <definition>Supplemental Guarantor Information Disclosure Text Block.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanServiceCost">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsSettledContracts">
    <definition>Settled Contracts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock">
    <definition>Schedule of nonvested restricted stock units activity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PropertyTaxesNoncurrentLiabilities">
    <definition>Property taxes.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AmortizationOfRegulatoryAsset">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_MinimumReductionInUtilitiesReduceEnergyConsumption">
    <definition>Minimum reduction in Utilities reduce energy consumption.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_RequiredPercentageOfReductionInMercuryEmission">
    <definition>Required percentage of reduction in mercury emission.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DecreaseNetIncomeDueToAdverseChangeInCommodityPrices">
    <definition>Decrease net income due to adverse change in commodity prices.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Sales.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccruedIncomeTaxesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityCommonStockSharesOutstanding">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_DocumentType">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsToAcquireIntangibleAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsTextBlock">
    <definition>Fair value and related carrying amounts of long-term debt and other long-term obligations.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessCombinationAcquisitionRelatedCosts">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanActuarialNetGainsLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ScheduleOfChangesInFairValueDerivativesNotInHedgingRelationsipWithRegulatoryOffsetTextBlock">
    <definition>Schedule of changes in fair value derivatives not in hedging relationsip with regulatory offset.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromIssuanceOfLongTermDebt">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ChangeToCompanyEarningsResultingFromRetireeHealthcareLiabilitiesAndRelatedTaxImpactAlreadyReflectedInConsolidatedFinancialStatements">
    <definition>Change to Company's earnings resulting from retiree healthcare liabilities and related tax impact already reflected in consolidated financial statements.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SupplementalGuarantorCondensedConsolidatingStatementsOfCashFlowsTextBlock">
    <definition>Condensed Consolidating Statements of Cash Flows.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanStockOptionsWeightedAverageVestingPeriod">
    <definition>Share based compensation arrangement by share based payment award other than stock options weighted average vesting period.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_GenerationCapacityOfFacilityFromWhichAllRevenueDerived">
    <definition>Generation Capacity of the facility from which all the company's revenue generated.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ReserveForAdversePurchasePowerCommitment">
    <definition>Reserve for adverse purchase power commitment.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UtilitiesRequiredToReducePeakDemandFromTwoThousandTenToTwoThousandEighteen">
    <definition>Utilities Required to Reduce Peak Demand From 2010 To 2018 in percentage</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UnamortizedGainsIncludedInLongTermDebtAssociatedWithPriorFixedForFloatingInterestRateSwapAgreementsNetOfTax">
    <definition>Unamortized gains included in long term debt associated with prior fixed for floating interest rate swap agreements Net of tax</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfCustomers">
    <definition>Number Of Customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccrualForEnvironmentalLossContingencies">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredIncomeTaxesAndTaxCredits">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AcquiredFiniteLivedIntangibleAssetAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfFacilitiesOfWhichCompanyOwnsOperatesAndControlsElectricGenerationCapacity">
    <definition>Number of facilities of which the company owns,  operates  and controls electric generation capacity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_MinimumReductionInUtilitiesPeakDemand">
    <definition>Minimum reduction in Utilities peak demand.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanSpecialTerminationBenefits">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PlanApprovedAsPerOrder">
    <definition>Plan Approved as per order.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitySalesTotal">
    <definition>Fair value measurement with unobservable inputs reconciliation recurring basis asset and liability sales total.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_Goodwill">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherLiabilitiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NetExposureToLossBasedUponCasualtyValueProvisionsTextBlock">
    <definition>Net exposure to loss based upon the casualty value provisions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NotesReceivableRelatedPartiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockIssued">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetsCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetCashProvidedByUsedInOperatingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueAssetsMeasuredOnRecurringBasis">
    <definition>Fair Value Assets Measured On Recurring Basis.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_GuaranteeObligationsCurrentCarryingValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityCentralIndexKey">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SupplementalGuarantorCondensedConsolidatingStatementsOfIncomeTextBlock">
    <definition>Condensed consolidating Statements of Income.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EarningsPerShareDiluted">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInInventories">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AcquisitionEquityInterestsIssuedOrIssuablePricePerShare">
    <definition>Acquisition equity interests issued or issuable price per share.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_AmendmentFlag">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DescriptionOfCostIncurredDueToImproperMarketToMarketSettlements">
    <definition>Description of cost incurred due to improper market to market settlements .</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLoss">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Realized gain loss.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionPurchasePriceAllocationNoncurrentLiabilities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AmountAmortizedToEarningsAsExpenses">
    <definition>Amount amortized to earnings as expenses.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ElectricDomesticRegulatedRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_OperatingLeaseCommitmentsNetPresentValue">
    <definition>Operating Lease Commitments Net Present Value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAdditionsOrChangeInValueOfExistingContracts">
    <definition>Derivative instruments not designated as hedging instruments additions or change in value of existing contracts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InterestAndDebtExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_TargetInstallationSmartMeter">
    <definition>Target installation smart meter.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CollateralAlreadyPostedAggregateFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PrepaidTaxes">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_RegulatedGenerationCapacity">
    <definition>Regulated generation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OffMarketLeaseUnfavorable">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DecommissioningFundInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_RevenuesAndEarningsOfBusinessAcquisitionTextBlock">
    <definition>Revenues and earnings of business acquisition.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VariableInterestEntitiesPercentageOfHighVoltageTransmissionLineProjectOwnedByVariableInterestEntityOneInJointVenturePartyTwo">
    <definition>Variable Interest Entities Percentage of high voltage transmission line project owned By variable interest entity one in joint venture party two.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxLiabilitiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_RevisedDecommisioningCosts">
    <definition>Revised decommisioning costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LiabilitiesAndStockholdersEquity">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ReclassificationsFromLongTermDebtIntoInterestExpense">
    <definition>Reclassifications from long-term debt into interest expense.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherReceivables">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssuances">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Issuances.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_LossesToBeAmortizedToInterestExpensesDuringNextTwelveMonths">
    <definition>Losses To Be Amortized To Interest Expenses During Next Twelve Months.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherLiabilitiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RetainedEarningsAccumulatedDeficit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetRetirementObligationDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FormerOwnershipOfSubsidiaryInWorkUnit">
    <definition>Former ownership of Subsidiary in Work Unit.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShortTermNonBankLoansAndNotesPayable">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfLongTermPowerPurchaseAgreementsMaintainedByParentCompanyWithNonUtilityGenerationEntities">
    <definition>Number of long term power purchase agreements maintained by parent company with Non utility generation entities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinorityInterest">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ReturnOnEquityGrantedAsIncentiveRider">
    <definition>Return on equity granted as incentive rider.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingIncomeLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CapitalInvestmentRequiredToInstallTechnologyToMeetTdsAndSulfateLimits">
    <definition>Capital investment required to install technology to meet the TDS and sulfate limits.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromShortTermDebt">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CappingOfGasOneEmissionsUnderCleanAirTransportRule">
    <definition>Capping of SO2 emissions under Clean Air Transport Rules.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentBeforeTaxPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromPaymentsForOtherFinancingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NonoperatingIncomeExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InventoryAdjustments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NotesReceivableNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_LoadServedFromRenewableEnergyResources">
    <definition>Load Served From Renewable Energy Resources.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueLiabilitiesMeasuredOnRecurringBasis">
    <definition>Fair Value Liabilities Measured On Recurring Basis.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PowerPurchaseContractLiability">
    <definition>Power purchase contract liability.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PlantCapacity">
    <definition>Plant Capacity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_LossContingencyDamagesSoughtValue">
    <definition>Loss Contingency Damages Sought Value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccountsReceivableRelatedPartiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_IncreaseElectricDistributionRates">
    <definition>Increase electric distribution rates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ContemplatedDeploymentOfSmartMeterInfrastructure">
    <definition>Contemplated deployment of smart meter infrastructure.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementsWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityNetValue">
    <definition>Fair value measurements with unobservable inputs reconciliation recurring basis asset and liability net value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InventoryNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsOfDividendsCommonStock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeLiabilitiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetIncomeLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ExpectedAdverseChangeInQuotedMarketPricesDerivativeInstruments">
    <definition>Expected adverse change in quoted market prices derivative instruments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_BusinessCombinationAcquiredDebtFairValue">
    <definition>Business combination acquired Debt fair value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConverted">
    <definition>Share based compensation arrangement by share based payment award equity instruments other than options converted.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AccumulatedProvisionForUncollectibleAccountsOther">
    <definition>Accumulated Provision For Uncollectible Accounts Other.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UnamortizedGainsOrLossesAssociatedWithDedesignatedCashFlowHedges">
    <definition>Unamortized gains or losses associated with dedesignated cash flow hedges.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UnrealizedGainLossOnDerivativesNotInHedgingRelationshipWithRegulatoryOffsetTextBlock">
    <definition>Unrealized gain loss on derivatives not in hedging relationship with regulatory offset.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LiabilitiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommitmentsAndContingencies2009">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetRetirementObligationsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SmartMeterInfrastructureDeployed">
    <definition>Smart meter infrastructure deployed.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FiniteLivedIntangibleAssetsNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeAssetsCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VolumeOfParentCompanysOutstandingDerivativeTransactionsTextBlock">
    <definition>Volume Of Parent Company's Outstanding Derivative Transactions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromSaleOfOtherProductiveAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ParentalGuaranteeAssociatedWithFundingOfDecommissioningCosts">
    <definition>Parental guarantee associated with funding of decommissioning costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SummaryOfConsolidatedResultsOfOperationsTextBlock">
    <definition>Summary of consolidated results of operations.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromPaymentsForLongTermLoansForRelatedParties">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PensionContributions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AnnualizedBaseRateIncrease">
    <definition>Annualized base rate increase.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_InvestmentsNotRequiredToBeDisclosed">
    <definition>Investments not required to be disclosed.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_HeldToMaturitySecuritiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityCurrentReportingStatus">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherAssetsCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UnamortizedSaleAndLeasebackCosts">
    <definition>Unamortized sale and leaseback costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityWellKnownSeasonedIssuer">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PeakingCapacity">
    <definition>Peaking capacity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NuclearPlantDecommissioningTrusts">
    <definition>Nuclear Plant Decommissioning Trusts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockDividendsPerShareDeclared">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfCurrentlyReportableOperatingSegments">
    <definition>Number of current reportable operating segments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetsHeldForSalePropertyPlantAndEquipment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CostsAvoidedByCustomers">
    <definition>Costs avoided by customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CompanyPostedCollateralRelatedToNetLiabilityPositions">
    <definition>Company Posted Collateral Related To Net Liability Positions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_WeightedAverageNumberOfSharesIssuedInConnectionWithMerger">
    <definition>Weighted average number of shares issued in connection with merger.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VolumeOfDerivativesSales">
    <definition>Volume Of Derivatives Sales.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_RequestedAmendmentDeemedToBeNecessary">
    <definition>Requested amendment deemed to be necessary.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionProFormaRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AdditionalPaidInCapitalCommonStock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SaleLeasebackTransactionDeferredGainNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ScheduleValuationOfIntangibleAssetsAndLiabilitiesAcquiredAsPartOfBusinessCombinationTextBlock">
    <definition>Schedule Valuation of Intangible Assets and Liabilities Acquired as Part of Business Combination.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_BusinessAcquisitionNumberOfAcquireeCommonStockExchanged">
    <definition>Business acquisition number of acquiree common stock exchanged.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityPurchasesTotal">
    <definition>Fair value measurement with unobservable inputs reconciliation recurring basis asset and liability purchases total.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NetLiabilityPositionUnderCommodityDerivativeContracts">
    <definition>Net Liability Position Under Commodity Derivative Contracts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EquityMethodInvestmentOwnershipPercentage">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedInPeriod">
    <definition>Share based compensation arrangement by share based payment award options converted in period.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PensionAndOtherPostretirementBenefitExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityRegistrantName">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_BusinessAcquisitionEquityInterestIssuedNumberOfSharesIssued">
    <definition>Business Acquisition Equity Interest Issued Number Of Shares Issued.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeLossTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitySettlementsTotal">
    <definition>Fair value measurement with unobservable inputs reconciliation recurring basis asset and liability settlements total.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RepaymentsOfShortTermDebt">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanInterestCost">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_InventoryAdjustmentsNetOfTax">
    <definition>Inventory adjustments net of tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CurrentLiabilityIncludedInAdversePurchasePowerCommitment">
    <definition>Current liability included in adverse purchase power commitment.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AssessmentPeriodCosts">
    <definition>Assessment period costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SettlementProposalClaims">
    <definition>Settlement proposal claims.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NetPeriodicPensionAndOtherPostEmploymentBenefitsCostsTextBlock">
    <definition>Net Periodic Pension and Other Post-Employment Benefits Costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfSharesToBeReceivedByAcquireeCompanyOnMerger">
    <definition>Number of shares to be received by acquiree company on merger.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationEquityInNetIncomeOfEquityMethodInvesteesOfSegment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeLiabilitiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ExpendituresForCostRecoveryProgram">
    <definition>Expenditures for cost recovery program.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VariableInterestEntitiesNetExposure">
    <definition>Variable Interest Entities Net Exposure.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetCashProvidedByUsedInInvestingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ReturnOnEquityGrantedForRegionalTransmissionOrganizationParticipation">
    <definition>Return on equity granted for RTO participation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_OperatingLossCarryForwardsNetOfTax">
    <definition>Operating loss carry forwards net of tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfCompaniesInvolvedInComplianceWithYetToBeDefinedModifiedBenchmarks">
    <definition>Number of companies involved in compliance with yet to be defined modified benchmarks.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AllocatedShareBasedCompensationExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FundToAssistLowIncomeCustomers">
    <definition>Fund to assist low income customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxExpenseBenefit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetImpairmentCharges">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod">
    <definition>Share based compensation arrangement by share based payment award equity instruments other than options exercised in period.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ProposedElectricConsumptionReductionPercentage">
    <definition>Proposed electric consumption reduction percentage.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionPurchasePriceAllocationNoncurrentLiabilitiesLongTermDebt">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherLongTermInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccountsPayableRelatedPartiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ApproximateIncreaseInRetailRates">
    <definition>Approximate increase in retail rates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TaxesExcludingIncomeAndExciseTaxes">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongtermTransitionBondCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfElectricGenerationFacilities">
    <definition>Number of electric generation facilities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AnnualRevenueRequirementsInZone">
    <definition>Annual Revenue Requirements In ATSI Zone related to Michigan Thumb Project.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesAmortizedCost">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DecreaseInEnecRates">
    <definition>Decrease in Enec rates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessCombinationConsiderationTransferred">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccountsReceivableNetCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ServiceArea">
    <definition>Service Area.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredPurchasedPowerCosts">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_EnvironmentalLiabilitiesFormerGasFacilities">
    <definition>Environmental Liabilities Former Gas Facilities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UnamortizedGainsIncludedInLongTermDebtAssociatedWithPriorFixedForFloatingInterestRateSwapAgreements">
    <definition>Unamortized gains included in long-term debt associated with prior fixed-for-floating interest rate swap agreements.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AssetImpairmentChargesTextBlock">
    <definition>Asset Impairment Charges.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_BusinessCombinationAcquiredDebtCarryingValue">
    <definition>Business combination acquired debt carrying value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGain">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ElectricityProductionFromRenewableSources">
    <definition>Electricity production from renewable sources.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DepreciationNonproduction">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_GenerationDiscountForLowIncomeCustomers">
    <definition>Generation discount for low income customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CappingOfGasOneEmissions">
    <definition>Capping of SO2 emissions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NoticeLetterRequired">
    <definition>Notice letter, required.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherAmortizationOfDeferredCharges">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CostOfPurchasedPowerFromAffiliates">
    <definition>Purchased power from affiliates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SupplementalGuarantorCondensedConsolidatingBalanceSheetsTextBlock">
    <definition>Condensed consolidating balance sheets.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DecreaseInAmountRecoveredForCostsIncurred">
    <definition>Decrease in amount recovered for costs incurred.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_EquityOwnershipPercentageByParent">
    <definition>Equity ownership percentage by parent.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueDisclosuresTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfGasCombinedCycleCombustionTurbinesSold">
    <definition>Number of gas combined cycle combustion turbines sold.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_InvestmentInAssociatedCompanies">
    <definition>Investment in associated companies.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInInterestPayableNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfGenerationFacilitiesFromWhichCompanyPurchasesEntireOutput">
    <definition>Number of generation facilities from which the company purchases entire output.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UnamortizedLossesAssociatedWithPriorInterestRateHedges">
    <definition>Unamortized losses associated with prior interest rate hedges.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfStockBasedCompensationPrograms">
    <definition>Number of stock based compensation programs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet">
    <definition>Derivatives not designated as hedging instruments at fair value net.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInAccountsPayableTrade">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UpperThresholdLimitForCarbonDiOxideEmission">
    <definition>Upper Threshold Limit For Carbon Di Oxide Emission.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_MarginalTransmissionLosses">
    <definition>Marginal transmission losses.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_DocumentFiscalPeriodFocus">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UtilitiesRequiredToReducePeakDemand">
    <definition>Utilities required to reduce peak demand in 2009 in percentage.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityRealizedGainLoss">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Realized gain loss.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PurchasePriceCalculationTextBlock">
    <definition>Purchase price calculation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShortTermBorrowings">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrealizedGainLossOnDerivatives">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ExciseAndSalesTaxes">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_TotalCapitalization">
    <definition>Total Capitalization.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PropertyTaxes">
    <definition>Property taxes.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeAssetNotDesignatedAsHedgingInstrumentFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PowerPlantsComplaints">
    <definition>Power plants complaints.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfDaysRequiredToIncreaseParentalGuarantee">
    <definition>Number of days required to increase Parental Guarantee.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DepreciationAndAmortization">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ScheduleOfGoodwillBySegmentTextBlock">
    <definition>Schedule of goodwill by segment.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ChangeInEffectiveTaxRateAsResultOfNonDeductiblePortionOfMergerTransactionAndIntegrationCosts">
    <definition>Change in effective tax rate as a result of non-deductible portion of merger transaction and integration costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationInterestIncomeExpenseNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_HeldToMaturitySecuritiesTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ExpensesRelatedToMergerSettlementsApprovedByRegulatoryAgencies">
    <definition>Expenses related to merger settlements approved by regulatory agencies.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PreTaxMergerIntegrationCosts">
    <definition>Pre-tax merger integration costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesGrossRealizedGains">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_RecoveryPeriodForExpendituresForCostRecoveryProgram">
    <definition>Recovery period for expenditures for cost recovery program.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsToAcquireProductiveAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecurities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ConstructionInProgressGross">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AdditionalCollateralAggregateFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_HeldToMaturitySecurities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedDeferredInvestmentTaxCredit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RepaymentsOfLongTermDebt">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_CurrentFiscalYearEndDate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PeriodOfPortfolioPlansFiledSeekingApprovalForProgramme">
    <definition>Period of the portfolio plans filed seeking approval for the programme.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NewVoltageTransmissionFacilitiesZonalTransmissionRate">
    <definition>New Voltage transmission facilities and zonal transmission rate.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsForProceedsFromInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_DocumentPeriodEndDate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ReclassificationsFromAccumulatedOtherComprehensiveLossIntoOtherOperatingExpense">
    <definition>Reclassifications from AOCL into other operating expense.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfInterestRateSwapAgrements">
    <definition>Number of Interest Rate Swap agrements.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfEventsOccured">
    <definition>Number of events occured.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CappingOfGasTwoEmissionsUnderCleanAirTransportRule">
    <definition>Capping of gas two emissions under clean air transport rule.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeLiabilityNotDesignatedAsHedgingInstrumentFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_LoadFollowingCapacity">
    <definition>Load following capacity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedInPeriodWeightedAverageExercisePrice">
    <definition>Share based compensation arrangement by share based payment award options converted in period weighted average exercise price.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CostOfPurchasedPower">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PropertyPlantAndEquipmentGross">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockSharesAuthorized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DecreaseNetIncomeDueToAdverseChangeInCommodityPricesNetOfTax">
    <definition>Decrease net income due to adverse change in commodity prices,Net of tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NetUnderpayments">
    <definition>Net underpayments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ProposedGreenhouseGasEmissionsReduction">
    <definition>Proposed greenhouse gas emissions reduction.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AdditionalBaseRateIncrease">
    <definition>Additional base rate increase.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_DocumentFiscalYearFocus">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_BusinessAcquisitionPurchasePriceAllocationInvestments">
    <definition>Business acquisition purchase price allocation investments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfGenerationUnits">
    <definition>Number of generation units.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FuelCosts">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DeliveryServiceImprovementRiderAverageRate">
    <definition>Delivery Service Improvement Rider Average Rate.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherCostAndExpenseOperating">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityUnrealizedGainLoss">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability unrealized gain loss.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetCashProvidedByUsedInFinancingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityTransfersNetTotal">
    <definition>Fair value measurement with unobservable inputs reconciliation recurring basis asset and liability transfers net total.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SeniorSecuredTermLoanFacility">
    <definition>Senior secured term loan facility.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionProFormaNetIncomeLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfOptionsProposedByEpaForAdditionalRegulationOfCoalCombustionResiduals">
    <definition>Number of options proposed by EPA for additional regulation of coal combustion residuals.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInAssetRetirementObligations">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasis">
    <definition>Fair value net assets liabilities measured on recurring basis.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SaleAndLeasebackTransactionsOfUndividedInterest">
    <definition>Sale and leaseback transactions of undivided interest.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_GuaranteeObligationsMaximumExposure">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CashBalanceExcludedFromAvailableForSaleSecurities">
    <definition>Cash Balance Excluded From Available For Sale Securities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PercentageOfReductionInFishImpingement">
    <definition>Percentage of reduction in fish impingement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AnnualEnergySavings">
    <definition>Annual Energy Savings.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisUnrealizedGainLossTotal">
    <definition>Fair value measurement with unobservable inputs reconciliation recurring basis unrealized gain (loss) total.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherAssetsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsToAcquireAvailableForSaleSecurities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_AssetsAndLiabilitiesMeasuredOnRecurringBasisTextBlock">
    <definition>Assets and liabilities measured on recurring basis.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ElectricWorldwideUnregulatedRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockValueOutstanding">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IntangibleAssetsNetExcludingGoodwill">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PropertyPlantAndEquipmentNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VolumeOfDerivativesNet">
    <definition>Volume Of Derivatives Net.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FinancialAssetsAndLiabilitiesInMerger">
    <definition>Financial assets and liabilities in merger.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ComprehensiveIncomeNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SpecifiedMinimumPercentageOfElectricitySoldToRetailCustomers">
    <definition>Specified minimum percentage of electricity sold to retail customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementsWithUnobservableInputsReconciliationRecurringBasisLiabilityValue">
    <definition>Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Liability Value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsForProceedsFromOtherInvestingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ScheduleOfNetBenefitCostsTableTextBlock">
    <definition>Schedule of net benefit costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NetPlantExcludingConstructionWorkInProgress">
    <definition>Net Plant Excluding Construction Work In Progress.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DeferredRentsAndLeaseMarketValuationLiability">
    <definition>Deferred Rents And Lease Market Valuation Liability.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAverageUsefulLife">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_SurplusMarginGuaranty">
    <definition>Surplus Margin Guaranty.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DefinedBenefitPlanAccumulatedBenefitObligationReducedAmount">
    <definition>Defined benefit plan accumulated benefit obligation reduced amount.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ProposedElectricDemandReductionPercentage">
    <definition>Proposed electric demand reduction percentage.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ElectricUtilityRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VegetationEncroachmentEvent">
    <definition>Vegetation Encroachment Event.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanBenefitObligation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanCurtailments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockParOrStatedValuePerShare">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CapAndTradeProgramToReduceMercuryEmissions">
    <definition>Cap and trade program to reduce mercury emissions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_GoodwillAcquiredDuringPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CostsAndExpenses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_InvestmentsExcludesReceivablesPayablesAndAccruedIncome">
    <definition>Investments excludes Receivables, Payables and Accrued income.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FundsProvidedForCopenhagenGreenClimateFund">
    <definition>Funds Provided for Copenhagen Green Climate Fund.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_InterestAndDebtExpenseAffiliates">
    <definition>Interest expense to affiliates</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssuances">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issuances.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock">
    <definition>Summary of stock option activities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_MergerTransactionsCostsNetOfTax">
    <definition>Merger transactions costs, Net of tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_IncreaseInRetailRates">
    <definition>Increase in retail rates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VariableInterestEntitiesPercentageOfHighVoltageTransmissionLineProjectOwnedByVariableInterestEntityOneInJointVenturePartyOne">
    <definition>Variable Interest Entities Percentage Of high voltage transmission line project owned By variable interest entity one in joint venture party one.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_MaximumAmountOfPenalityAssessedPerDayPerViolation">
    <definition>Maximum amount of penality assessed per day per violation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueOfCommodityDerivativesTextBlock">
    <definition>Fair value of commodity derivatives.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CashCollateralNet">
    <definition>Cash Collateral Net.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfPreviouslyReportableOperatingSegments">
    <definition>Number of previously reportable operating segments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InvestmentIncomeInterestAndDividend">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_CappingOfGasTwoEmissions">
    <definition>Capping of NOx emissions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanContributionsByEmployer">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProfitLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsGainRecognizedInIncome">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases">
    <definition>Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ScheduleOfPurchasePriceAllocationTableTextBlock">
    <definition>Schedule of purchase price allocation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_NumberOfExistingUtilityOperatingCompanies">
    <definition>Number of existing utility operating companies.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_BusinessCombinationIntegrationCosts">
    <definition>Business Combination Integration costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityVoluntaryFilers">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_VariableInterestEntitiesDistributionsToOwners">
    <definition>Variable interest entities distributions to owners.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_DeferredCompensationArrangementWithIndividualNumberOfSharesAvailableForGrant">
    <definition>Deferred Compensation Arrangement With Individual Number Of Shares Available For Grant.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_HeldToMaturitySecuritiesFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageVestingPeriod">
    <definition>Share based compensation arrangement by share based payment award options weighted average vesting period.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInPrepaidExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefits">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_UnamortizedLossesAssociatedWithPriorInterestRateHedgesNetOfTax">
    <definition>Unamortized losses associated with prior interest rate hedges net of tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsDeferredIncome">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_VariableInterestMaximumExposureToLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RegulatoryAssetsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccountsPayableCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeFairValueOfDerivativeNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NotionalAmountOfInterestRateFairValueHedgeDerivatives">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_PeriodOfCycle">
    <definition>Period of Cycle.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="fe_ScheduleOfEarningsPerShareReconciliationTableTextBlock">
    <definition>Schedule of earnings per share reconciliation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
</DefinitionAndReference>
