2.2.0.7 true Commitments, Guarantees and Contingencies (Details) (USD $) 00609 - Disclosure - Commitments, Guarantees and Contingencies (Details) true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 EPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD true false false false Normal Condition [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi fe_NormalConditionMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 3 USD true false false false Normal Condition [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi fe_NormalConditionMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember false false Below 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http://xbrl.org/2006/xbrldi fe_NormalConditionMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember false false Acceleration Of Payment [Member] us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis xbrldi http://xbrl.org/2006/xbrldi fe_AccelerationOfPaymentMember us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false Stress Condition [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi fe_StressConditionMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false Stress Condition [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi fe_StressConditionMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember false false Below Investment Grade Credit Rating [Member] us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis xbrldi http://xbrl.org/2006/xbrldi fe_BelowInvestmentGradeCreditRatingMember us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false Stress Condition [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi fe_StressConditionMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember false false Material Adverse Event [Member] us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis xbrldi http://xbrl.org/2006/xbrldi fe_MaterialAdverseEventMember us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 USD true false false false Stress Condition [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi fe_StressConditionMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember false false Acceleration Of Payment [Member] us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis xbrldi http://xbrl.org/2006/xbrldi fe_AccelerationOfPaymentMember us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 10 USD true false false false Parental Guarantees [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi fe_ParentalGuaranteesMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false Subsidiaries Guarantees [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiariesGuaranteesMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 USD true false false false CEI [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiaryTwoMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 13 USD true false false false TE [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiaryThreeMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 14 USD true false false false JCP&L [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiaryFourMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 15 USD true false false false FGCO [ Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_NonGuarantorSubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 16 USD true false false false Parent Company [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentCompanyMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 17 true false false false Tons [Member] fe_CommitmentsMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_TonsMember fe_CommitmentsMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 Tons Standard http://firstenergycorp.com/20100930 tons fe 0 false 18 true false false false Tons [Member] fe_CommitmentsMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_TonsMember fe_CommitmentsMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 19 true false false false Percent [Member] fe_CommitmentsMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_PercentMember fe_CommitmentsMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 20 true false false false Percent [Member] fe_CommitmentsMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_PercentMember fe_CommitmentsMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 21 true false false false Days [Member] fe_CommitmentsMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_DaysMember fe_CommitmentsMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 5 Commitments, Guarantees and Contingencies (Textuals) 3 fe_CommitmentsGuaranteesAndContingenciesTextualsAbstract fe false na duration Commitments Guarantees and Contingencies. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:stringItemType string Commitments Guarantees and Contingencies. false 6 Outstanding guarantees and other assurances aggregated 4 us-gaap_GuaranteeObligationsCurrentCarryingValue us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 3800000000 3800000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 true true false false 800000000 800000000 true false false 11 true true false false 2500000000 2500000000 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph c false 7 Maximum exposure under collateral provisions 4 us-gaap_GuaranteeObligationsMaximumExposure us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 419000000 419000000 true false false 3 false true false false 374000000 374000000 true false false 4 false true false false 45000000 45000000 true false false 5 false true false false 175000000 175000000 true false false 6 false true false false 511000000 511000000 true false false 7 false true false false 463000000 463000000 true false false 8 false true false false 48000000 48000000 true false false 9 false true false false 175000000 175000000 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph b false 8 Surety bonds and related guarantees 4 fe_SuretyBondsAndRelatedGuarantees fe false credit instant Surety bonds and related guarantees. false false false false false false false false false false false verboselabel false 1 false true false false 84000000 84000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Surety bonds and related guarantees. No authoritative reference available. false 9 Outstanding collateral payments 4 fe_GuaranteesAndSuretyBondsContracts fe false credit instant Guarantees and Surety Bonds Contracts. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 244000000 244000000 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Guarantees and Surety Bonds Contracts. No authoritative reference available. false 10 NGC entered into a Surplus Margin Guaranty 4 fe_SurplusMarginGuaranty fe false credit instant Surplus Margin Guaranty. false false false false false false false false false false false verboselabel false 1 false true false false 500000000 500000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Surplus Margin Guaranty. No authoritative reference available. false 11 Capital expenditures for environmental compliance 4 us-gaap_EnvironmentalRemediationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 399000000 399000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 147, 148, 149, 150 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 2 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 90-8 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 170 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10 false 12 Number of days required prior to the filing of a citizen suit under notice 4 fe_NoticeLetterRequired fe false na instant Notice letter, required. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false true false false 60 60 true false false xbrli:integerItemType integer Notice letter, required. No authoritative reference available. false 13 JCP&L former owning in Keystone Station and Penelec (In Percentage) 4 fe_FormerOwnershipOfSubsidiaryInWorkUnit fe false na instant Former ownership of Subsidiary in Work Unit. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false true false false 0.1667 0.1667 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false us-types:percentItemType pure Former ownership of Subsidiary in Work Unit. No authoritative reference available. false 14 Capping of SO2 emissions (In Tons) 4 fe_CappingOfGasOneEmissions fe false na instant Capping of SO2 emissions. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false true false false 2500000 2500000 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:decimalItemType decimal Capping of SO2 emissions. No authoritative reference available. false 15 Capping of NOx emissions (In Tons) 4 fe_CappingOfGasTwoEmissions fe false na instant Capping of NOx emissions. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false true false false 1300000 1300000 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:decimalItemType decimal Capping of NOx emissions. No authoritative reference available. false 16 Cap-and-trade program to reduce mercury emissions by 2010 (In Tons) 4 fe_CapAndTradeProgramToReduceMercuryEmissionsAfterOneYear fe false na instant Cap-and-trade program to reduce mercury emissions after one year. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false true false false 38 38 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:integerItemType integer Cap-and-trade program to reduce mercury emissions after one year. No authoritative reference available. false 17 Cap-and-trade program to reduce mercury emissions by 2018 (In Tons) 4 fe_CapAndTradeProgramToReduceMercuryEmissionsAfterNineYears fe false na instant Cap-and-trade program to reduce mercury emissions after nine years. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false true false false 15 15 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:integerItemType integer Cap-and-trade program to reduce mercury emissions after nine years. No authoritative reference available. false 18 Electricity production from renewable sources (In Percentage) 4 fe_ElectricityProductionFromRenewableSources fe false na duration Electricity production from renewable sources. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false true false false 0.25 0.25 true false false 19 false false false false 0 0 true false false 20 false true false false 0.1 0.1 true false false 21 false false false false 0 0 true false false us-types:percentItemType pure Electricity production from renewable sources. No authoritative reference available. false 19 Uppper threshold limit for carbon di oxide emission (Tons per Year) 4 fe_UppperThresholdLimitForCarbonDiOxideEmission fe false na instant Uppper threshold limit for carbon di oxide emission. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false true false false 75000 75000 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:integerItemType integer Uppper threshold limit for carbon di oxide emission. No authoritative reference available. false 20 Total environmental liabilities 4 fe_EnvironmentalRemediationLiabilitiesAccrued fe false credit instant Environmental Remediation Liabilities Accrued. false false false false false false false false false false false verboselabel false 1 false true false false 105000000 105000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false true false false 1000000 1000000 true false false 13 false true false false 1000000 1000000 true false false 14 false true false false 76000000 76000000 true false false 15 false true false false 1000000 1000000 true false false 16 false true false false 26000000 26000000 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Environmental Remediation Liabilities Accrued. No authoritative reference available. false 21 Parental guarantee associated with the funding of decommissioning costs 4 fe_ParentalGuaranteeAssociatedWithFundingOfDecommissioningCosts fe false credit instant Parental guarantee associated with funding of decommissioning costs. false false false false false false false false false false false verboselabel false 1 false true false false 15000000 15000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Parental guarantee associated with funding of decommissioning costs. No authoritative reference available. false 22 Outstanding guarantees related to energy and energy related contracts 4 fe_OutstandingGuaranteesRelatedToEnergyAndEnergyRelatedContracts fe false credit instant Outstanding guarantees related to energy and energy related contracts. false false false false false false false false false false false false 1 false true false false 300000000 300000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Outstanding guarantees related to energy and energy related contracts. No authoritative reference available. false 23 Additional FES collateral payments 4 fe_AdditionalFesCollateralPayments fe false credit instant Additional FES collateral payments. false false false false false false false false false false false false 1 false true false false 46000000 46000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Additional FES collateral payments. No authoritative reference available. false 24 Percent change in confidence level over one year 4 fe_PercentChangeInConfidenceLevelOverOneYear fe false na instant Percent change in confidence level over one year. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false true false false 0.95 0.95 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false us-types:percentItemType pure Percent change in confidence level over one year. No authoritative reference available. false 25 Surety bonds and lines of credit 4 fe_SuretyBondsAndLinesOfCredit fe false credit instant Surety bonds and lines of credit. false false false false false false false false false false false false 1 false true false false 500000000 500000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Surety bonds and lines of credit. No authoritative reference available. false 26 Funds provided over next three years 4 fe_FundsProvidedOverNextThreeYears fe false credit duration Funds provided over the next three years. false false false false false false false false false false false false 1 false true false false 30000000000 30000000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Funds provided over the next three years. No authoritative reference available. false 27 Funds provided by 2020 4 fe_FundsProvidedBy2020 fe false credit duration Funds provided by 2020. false false false false false false false false false false false false 1 false true false false 100000000000 100000000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Funds provided by 2020. No authoritative reference available. false 28 Capping of SO2 emissions under CATR 4 fe_CappingOfGasOneEmissionsUnderCleanAirTransportRule fe false na duration Capping of SO2 emissions under Clean Air Transport Rules. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false true false false 2600000 2600000 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:integerItemType integer Capping of SO2 emissions under Clean Air Transport Rules. No authoritative reference available. false 29 Proposed Greenhouse Gas emissions reduction by Twenty Fifty 4 fe_ProposedGreenhouseGasEmissionsReductionByTwentyFifty fe false na duration Proposed greenhouse gas emissions reduction by 2050. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false true false false 0.8 0.8 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false us-types:percentItemType pure Proposed greenhouse gas emissions reduction by 2050. No authoritative reference available. false 30 Environmental Liabilities Former Gas Facilities 4 fe_EnvironmentalLiabilitiesFormerGasFacilities fe false credit instant Environmental Liabilities Former Gas Facilities. false false false false false false false false false false false false 1 false true false false 67000000 67000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Environmental Liabilities Former Gas Facilities. No authoritative reference available. false 31 Nuclear Plant Decommissioning Trusts 4 fe_NuclearPlantDecommissioningTrusts fe false debit instant Nuclear Plant Decommissioning Trusts. false false false false false false false false false false false false 1 true true false false 2000000000 2000000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false xbrli:monetaryItemType monetary Nuclear Plant Decommissioning Trusts. No authoritative reference available. false 21 27 false NoRounding UnKnown UnKnown true true