2.2.0.25truefalse0614 - Disclosure - Commitments, Guarantees and Contingencies (Details)truefalsefalse1falsefalsefalsefalse1/1/2012 - 12/31/2012 TwelveMonthsEnded_31Dec2012http://www.sec.gov/CIK0001031296duration2012-01-01T00:00:002012-12-31T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli02falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0001031296duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0MWHStandardhttp://firstenergycorp.com/2010-12-31MWHfe0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008 USD ($) USD ($) / shares $TwelveMonthsEnded_31Dec2008http://www.sec.gov/CIK0001031296duration2008-01-01T00:00:002008-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$4falsefalseUSDfalsefalse9/30/2010 USD ($) $BalanceAsOf_30Sep2010http://www.sec.gov/CIK0001031296instant2010-09-30T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]3false0fe_PublicLiabilityAssessedWithRespectToSingleNuclearIncidentBasedOnActfefalsedebitdurationPublic liability assessed with respect to a single nuclear incident based on Price-Anderson Act.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse1260000000012600000000falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPublic liability assessed with respect to a single nuclear incident based on Price-Anderson Act.No authoritative reference available.falsefalsePublic liability assessed with respect to a single nuclear incident based on Price-Anderson Act4false0fe_NuclearIncidenceLiabilityPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterestsfefalsedebitdurationNuclear Incidence liability not more than in any one year per incident of Parent and Subsidiary company's based on their...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse470000000470000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNuclear Incidence liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests.No authoritative reference available.falsefalseNuclear incident liability per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests5false0fe_NuclearIncidentLiabilityNotMoreThanInAnyOneYearPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterestsfefalsedebitdurationNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse7000000070000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests.No authoritative reference available.falsefalseNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests6false0fe_MaximumAggregateAssessmentForIncidentsfefalsedebitdurationMaximum aggregate assessment for incidents (approximately).falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse90000009000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum aggregate assessment for incidents (approximately).No authoritative reference available.falsefalseMaximum aggregate assessment for incidents (approximately)7false0fe_RetrospectiveAssessmentsLiabilitiesfefalsedebitdurationRetrospective assessments liability.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse6100000061000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRetrospective assessments liability.No authoritative reference available.falsefalseRetrospective assessments liabilities8false0fe_AggregateIndemnityForReplacementPowerCostsfefalsedebitdurationAggregate indemnity for replacement power costs.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse14000000001400000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate indemnity for replacement power costs.No authoritative reference available.falsefalseAggregate indemnity for replacement power costs9false0fe_CoverageOfDecontaminationCostsAsPerPropertyDamageInsurancefefalsedebitdurationCoverage of decontamination costs as per property damage insurance.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse28000000002800000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCoverage of decontamination costs as per property damage insurance.No authoritative reference available.falsefalseCoverage of decontamination costs as per property damage insurance provided by NEIL10false0us-gaap_GuaranteeObligationsCurrentCarryingValueus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse37000000003700000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe 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 falsefalseOutstanding guarantees and other assurances aggregated11false0fe_SuretyBondsAndRelatedGuaranteesfefalsecreditinstantSurety bonds and related guarantees.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse8200000082000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySurety bonds and related guarantees.No authoritative reference available.falsefalseSurety bonds and related guarantees12false0fe_SurplusMarginGuarantyfefalsecreditinstantSurplus Margin Guaranty.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse500000000500000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySurplus Margin Guaranty.No authoritative reference available.falsefalseNGC entered into a Surplus Margin Guaranty13false0fe_ExpectedNumberOfNuclearPowerPlantLicensedToOperatefefalsenadurationExpected Number Of Nuclear Power Plant Licensed To Operate.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse104104falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerExpected Number Of Nuclear Power Plant Licensed To Operate.No authoritative reference available.falsefalseExpected number of nuclear power plant licensed to operate14false0fe_PeriodOfTimeWhenReplacementPowerCostsIncurredByDuringOutagefefalsenadurationPeriod Of Time When Replacement Power Costs Incurred By During Outage.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00After an initial 26-week waiting periodfalsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPeriod Of Time When Replacement Power Costs Incurred By During Outage.No authoritative reference available.falsefalsePeriod of time when replacement power costs incurred by during an outage15false0fe_PortionOfInsuranceCoverageOfPrivateInsurerIncludedInSingleNuclearIncidentLiabilityfefalsedebitdurationPortion Of Insurance Coverage Of Private Insurer Included In Single Nuclear Incident Liability.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse375000000375000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPortion Of Insurance Coverage Of Private Insurer Included In Single Nuclear Incident Liability.No authoritative reference available.falsefalsePortion of insurance coverage of a privet insurer included in single nuclear incident liability16false0fe_LossesInExcessOfPrivateInsuranceContributedForEachNuclearUnitLicensefefalsedebitdurationLosses In Excess Of Private Insurance Contributed For Each Nuclear Unit License.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse118000000118000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryLosses In Excess Of Private Insurance Contributed For Each Nuclear Unit License.No authoritative reference available.falsefalselosses in excess of private insurance contributed for each nuclear unit license17false0fe_LossesInExcessOfPrivateInsuranceContributedForEachNuclearUnitLicensePerUnitfefalsedebitdurationLosses In Excess Of Private Insurance Contributed For Each Nuclear Unit License Per Unit.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse1800000018000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryLosses In Excess Of Private Insurance Contributed For Each Nuclear Unit License Per Unit.No authoritative reference available.falsefalseLoosses in excess of private insurance contributed for each nuclear unit license, per unit18false0fe_PortionOfInsuranceCoverageByIndustryRetrospectiveRatingPlanfefalsedebitdurationPortion Of Insurance Coverage By Industry Retrospective Rating Plan.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse1220000000012200000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPortion Of Insurance Coverage By Industry Retrospective Rating Plan.No authoritative reference available.falsefalsePortion of Insurance coverage by industry retospective rating plan19false0fe_SeniorSecuredTermLoanFacilityfefalsecreditinstantSenior secured term loan facility.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse350000000350000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySenior secured term loan facility.No authoritative reference available.falsefalseSignal Peak and Global Rail entered into a syndicated two-year senior secured term loan facility20false0fe_PowerPlantsComplaintsfefalsenadurationPower plants complaints.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse33falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerPower plants complaints.No authoritative reference available.falsefalseNumber of complaints filed against FGCO21false0fe_ElectricityProductionFromRenewableSourcesfefalsenadurationElectricity production from renewable sources.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.100.10falsefalsefalsefalsefalse2truetruefalse0.250.25falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureElectricity production from renewable sources.No authoritative reference available.falsefalseElectricity production from renewable sources (In Percentage)22false0fe_EnvironmentalRemediationLiabilitiesAccruedfefalsecreditinstantEnvironmental Remediation Liabilities Accrued.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse104000000104000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEnvironmental Remediation Liabilities Accrued.No authoritative reference available.falsefalseTotal environmental liabilities23false0fe_InsuranceCoverageForReplacementPowerCostsfefalsecreditinstantInsurance coverage for replacement power costs.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse11000000001100000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryInsurance coverage for replacement power costs.No authoritative reference available.falsefalseInsurance coverage for replacement power costs24false0fe_ParentalGuaranteeAssociatedWithFundingOfDecommissioningCostsfefalsecreditinstantParental guarantee associated with funding of decommissioning costs.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse1500000015000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryParental guarantee associated with funding of decommissioning costs.No authoritative reference available.falsefalseParental guarantee associated with the funding of decommissioning costs25false0fe_OutstandingGuaranteesRelatedToEnergyAndEnergyRelatedContractsfefalsecreditinstantOutstanding guarantees related to energy and energy related contracts.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse300000000300000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryOutstanding guarantees related to energy and energy related contracts.No authoritative reference available.falsefalseOutstanding guarantees related to energy and energy related contracts26false0fe_AdditionalFesCollateralPaymentsfefalsecreditinstantAdditional FES collateral payments.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse2800000028000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAdditional FES collateral payments.No authoritative reference available.falsefalseAdditional FES collateral payments27false0fe_SuretyBondsAndLinesOfCreditfefalsecreditinstantSurety bonds and lines of credit.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse400000000400000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySurety bonds and lines of credit.No authoritative reference available.falsefalseSurety bonds and lines of credit28false0fe_FundsProvidedOverNextThreeYearsfefalsecreditdurationFunds provided over the next three years.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse3000000000030000000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFunds provided over the next three years.No authoritative reference available.falsefalseFunds provided over next three years29false0fe_FundsProvidedBy2020fefalsecreditdurationFunds provided by 2020.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse100000000000100000000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFunds provided by 2020.No authoritative reference available.falsefalseFunds provided by 202030false0fe_NumberOfOptionsProposedByEpaForAdditionalRegulationOfCoalCombustionResidualsfefalsenainstantNumber of options proposed by EPA for additional regulation of coal combustion residuals.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse002falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNumber of options proposed by EPA for additional regulation of coal combustion residuals.No authoritative reference available.falsefalseNumber of options proposed by EPA for additional regulation of coal combustion residuals31false0fe_EnvironmentalLiabilitiesFormerGasFacilitiesfefalsecreditinstantEnvironmental Liabilities Former Gas Facilities.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse6400000064000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEnvironmental Liabilities Former Gas Facilities.No authoritative reference available.falsefalseEnvironmental Liabilities Former Gas Facilities32false0fe_NuclearPlantDecommissioningTrustsfefalsedebitinstantNuclear Plant Decommissioning Trusts.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse20000000002000000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNuclear Plant Decommissioning Trusts.No authoritative reference available.falsefalseNuclear Plant Decommissioning Trusts33false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Normal Condition [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Normal_Condition_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseNormal Condition [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_NormalConditionMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseNormal Condition [Member]34true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]35false0us-gaap_GuaranteeObligationsMaximumExposureus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse468000000468000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum 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 falsefalseMaximum exposure under collateral provisions36false0fe_GuaranteesAndSuretyBondsContractsfefalsecreditinstantGuarantees and Surety Bonds Contracts.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse185000000185000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryGuarantees and Surety Bonds Contracts.No authoritative reference available.falsefalseOutstanding collateral payments37false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse6falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Normal Condition [Member] {us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis} : Below Investment Grade Credit Rating [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Normal_Condition_Member_Below_Investment_Grade_Credit_Rating_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseNormal Condition [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_NormalConditionMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberfalsefalseBelow Investment Grade Credit Rating [Member]us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldife_BelowInvestmentGradeCreditRatingMemberus-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseNormal Condition [Member] | Below Investment Grade Credit Rating [Member]38true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]39false0us-gaap_GuaranteeObligationsMaximumExposureus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse429000000429000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum 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 falsefalseMaximum exposure under collateral provisions40false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse7falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Normal Condition [Member] {us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis} : Material Adverse Event [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Normal_Condition_Member_Material_Adverse_Event_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseNormal Condition [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_NormalConditionMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberfalsefalseMaterial Adverse Event [Member]us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldife_MaterialAdverseEventMemberus-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseNormal Condition [Member] | Material Adverse Event [Member]41true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]42false0us-gaap_GuaranteeObligationsMaximumExposureus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse3900000039000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum 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 falsefalseMaximum exposure under collateral provisions43false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse8falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Normal Condition [Member] {us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis} : Acceleration Of Payment [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Normal_Condition_Member_Acceleration_Of_Payment_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseNormal Condition [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_NormalConditionMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberfalsefalseAcceleration Of Payment [Member]us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldife_AccelerationOfPaymentMemberus-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseNormal Condition [Member] | Acceleration Of Payment [Member]44true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]45false0us-gaap_GuaranteeObligationsMaximumExposureus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse224000000224000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum 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 falsefalseMaximum exposure under collateral provisions46false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse9falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Stress Condition [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Stress_Condition_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseStress Condition [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_StressConditionMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseStress Condition [Member]47true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]48false0us-gaap_GuaranteeObligationsMaximumExposureus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse532000000532000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum 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 falsefalseMaximum exposure under collateral provisions49false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse10falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Stress Condition [Member] {us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis} : Below Investment Grade Credit Rating [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Stress_Condition_Member_Below_Investment_Grade_Credit_Rating_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseStress Condition [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_StressConditionMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberfalsefalseBelow Investment Grade Credit Rating [Member]us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldife_BelowInvestmentGradeCreditRatingMemberus-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseStress Condition [Member] | Below Investment Grade Credit Rating [Member]50true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]51false0us-gaap_GuaranteeObligationsMaximumExposureus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse486000000486000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum 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 falsefalseMaximum exposure under collateral provisions52false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse11falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Stress Condition [Member] {us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis} : Material Adverse Event [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Stress_Condition_Member_Material_Adverse_Event_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseStress Condition [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_StressConditionMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberfalsefalseMaterial Adverse Event [Member]us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldife_MaterialAdverseEventMemberus-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseStress Condition [Member] | Material Adverse Event [Member]53true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]54false0us-gaap_GuaranteeObligationsMaximumExposureus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse4600000046000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum 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 falsefalseMaximum exposure under collateral provisions55false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse12falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Stress Condition [Member] {us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxis} : Acceleration Of Payment [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Stress_Condition_Member_Acceleration_Of_Payment_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseStress Condition [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_StressConditionMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberfalsefalseAcceleration Of Payment [Member]us-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldife_AccelerationOfPaymentMemberus-gaap_GuaranteeObligationsByPaymentAndPerformanceRiskCreditRatingAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseStress Condition [Member] | Acceleration Of Payment [Member]56true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]57false0us-gaap_GuaranteeObligationsMaximumExposureus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse224000000224000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum 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 falsefalseMaximum exposure under collateral provisions58false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse13falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Parental Guarantees [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Parental_Guarantees_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseParental Guarantees [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_ParentalGuaranteesMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseParental Guarantees [Member]59true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]60false0us-gaap_GuaranteeObligationsCurrentCarryingValueus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse800000000800000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe 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 falsefalseOutstanding guarantees and other assurances aggregated61false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse14falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Subsidiaries Guarantees [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Subsidiaries_Guarantees_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseSubsidiaries Guarantees [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldife_SubsidiariesGuaranteesMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseSubsidiaries Guarantees [Member]62true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]63false0us-gaap_GuaranteeObligationsCurrentCarryingValueus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse25000000002500000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe 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 falsefalseOutstanding guarantees and other assurances aggregated64false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse15falsefalseUSDtruefalse{dei_LegalEntityAxis} : FE [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fe_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFE [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FeMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseFE [Member]65true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]66false0fe_EnvironmentalRemediationLiabilitiesAccruedfefalsecreditinstantEnvironmental Remediation Liabilities Accrued.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse3200000032000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEnvironmental Remediation Liabilities Accrued.No authoritative reference available.falsefalseTotal environmental liabilities67false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse16falsefalseUSDtruefalse{dei_LegalEntityAxis} : CEI [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Cei_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseCEI [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_CeiMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseCEI [Member]68true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]69false0fe_EnvironmentalRemediationLiabilitiesAccruedfefalsecreditinstantEnvironmental Remediation Liabilities Accrued.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse10000001000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEnvironmental Remediation Liabilities Accrued.No authoritative reference available.falsefalseTotal environmental liabilities70false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse17falsefalseUSDtruefalse{dei_LegalEntityAxis} : FGCO [ Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Non_Guarantor_Subsidiaries_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFGCO [ Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_NonGuarantorSubsidiariesMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseFGCO [ Member]71true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]72false0fe_EnvironmentalRemediationLiabilitiesAccruedfefalsecreditinstantEnvironmental Remediation Liabilities Accrued.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse10000001000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEnvironmental Remediation Liabilities Accrued.No authoritative reference available.falsefalseTotal environmental liabilities73false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse18falsefalseUSDtruefalse{dei_LegalEntityAxis} : JCP&L [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&L [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseJCP&L [Member]74true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]75false0fe_EnvironmentalRemediationLiabilitiesAccruedfefalsecreditinstantEnvironmental Remediation Liabilities Accrued.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse6900000069000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEnvironmental Remediation Liabilities Accrued.No authoritative reference available.falsefalseTotal environmental liabilities76false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse19falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] 1/1/2010 - 12/31/2010 USD ($) $TwelveMonthsEnded_31Dec2010_Oe_Memberhttp://www.sec.gov/CIK0001031296duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseOE [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseOE [Member]77true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]78false0fe_NuclearIncidenceLiabilityPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterestsfefalsedebitdurationNuclear Incidence liability not more than in any one year per incident of Parent and Subsidiary company's based on their...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse4000000040000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNuclear Incidence liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests.No authoritative reference available.falsefalseNuclear incident liability per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests79false0fe_NuclearIncidentLiabilityNotMoreThanInAnyOneYearPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterestsfefalsedebitdurationNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse60000006000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests.No authoritative reference available.falsefalseNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests80false0fe_MaximumAggregateAssessmentForIncidentsfefalsedebitdurationMaximum aggregate assessment for incidents (approximately).falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse10000001000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum aggregate assessment for incidents (approximately).No authoritative reference available.falsefalseMaximum aggregate assessment for incidents (approximately)81false0fe_RetrospectiveAssessmentsLiabilitiesfefalsedebitdurationRetrospective assessments liability.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse50000005000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRetrospective assessments liability.No authoritative reference available.falsefalseRetrospective assessments liabilities82false0fe_AggregateIndemnityForReplacementPowerCostsfefalsedebitdurationAggregate indemnity for replacement power costs.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse120000000120000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate indemnity for replacement power costs.No authoritative reference available.falsefalseAggregate indemnity for replacement power costs83false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse20falsefalseUSDtruefalse{dei_LegalEntityAxis} : NGC [Member] 1/1/2010 - 12/31/2010 USD ($) $TwelveMonthsEnded_31Dec2010_Ngc_Memberhttp://www.sec.gov/CIK0001031296duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseNGC [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_NgcMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseNGC [Member]84true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]85false0fe_NuclearIncidenceLiabilityPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterestsfefalsedebitdurationNuclear Incidence liability not more than in any one year per incident of Parent and Subsidiary company's based on their...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse408000000408000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNuclear Incidence liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests.No authoritative reference available.falsefalseNuclear incident liability per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests86false0fe_NuclearIncidentLiabilityNotMoreThanInAnyOneYearPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterestsfefalsedebitdurationNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse6100000061000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests.No authoritative reference available.falsefalseNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests87false0fe_MaximumAggregateAssessmentForIncidentsfefalsedebitdurationMaximum aggregate assessment for incidents (approximately).falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse80000008000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum aggregate assessment for incidents (approximately).No authoritative reference available.falsefalseMaximum aggregate assessment for incidents (approximately)88false0fe_RetrospectiveAssessmentsLiabilitiesfefalsedebitdurationRetrospective assessments liability.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse5200000052000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRetrospective assessments liability.No authoritative reference available.falsefalseRetrospective assessments liabilities89false0fe_AggregateIndemnityForReplacementPowerCostsfefalsedebitdurationAggregate indemnity for replacement power costs.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse12200000001220000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate indemnity for replacement power costs.No authoritative reference available.falsefalseAggregate indemnity for replacement power costs90false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse21falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] 1/1/2010 - 12/31/2010 USD ($) $TwelveMonthsEnded_31Dec2010_Te_Memberhttp://www.sec.gov/CIK0001031296duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseTE [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseTE [Member]91true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]92false0fe_NuclearIncidenceLiabilityPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterestsfefalsedebitdurationNuclear Incidence liability not more than in any one year per incident of Parent and Subsidiary company's based on their...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse2200000022000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNuclear Incidence liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests.No authoritative reference available.falsefalseNuclear incident liability per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests93false0fe_NuclearIncidentLiabilityNotMoreThanInAnyOneYearPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterestsfefalsedebitdurationNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse30000003000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests.No authoritative reference available.falsefalseNuclear incident liability not more than in any one year per incident of Parent and Subsidiary company's based on their present nuclear ownership and leasehold interests94false0fe_MaximumAggregateAssessmentForIncidentfefalsenadurationMaximum aggregate assessment for incident.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00less than 1falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringMaximum aggregate assessment for incident.No authoritative reference available.falsefalseMaximum aggregate assessment for incident95false0fe_RetrospectiveAssessmentsLiabilitiesfefalsedebitdurationRetrospective assessments liability.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse20000002000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRetrospective assessments liability.No authoritative reference available.falsefalseRetrospective assessments liabilities96false0fe_AggregateIndemnityForReplacementPowerCostsfefalsedebitdurationAggregate indemnity for replacement power costs.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse6400000064000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate indemnity for replacement power costs.No authoritative reference available.falsefalseAggregate indemnity for replacement power costs97false0fe_EnvironmentalRemediationLiabilitiesAccruedfefalsecreditinstantEnvironmental Remediation Liabilities Accrued.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse10000001000000falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEnvironmental Remediation Liabilities Accrued.No authoritative reference available.falsefalseTotal environmental liabilities98false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse22falsefalsetruefalse{dei_LegalEntityAxis} : Met Ed, Penelec And JCP&L 1/1/2010 - 12/31/2010 TwelveMonthsEnded_31Dec2010_Met_Ed_Penelec_And_Jcp_And_L_Memberhttp://www.sec.gov/CIK0001031296duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseMet Ed, Penelec And JCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdPenelecAndJcpAndLMemberdei_LegalEntityAxisexplicitMemberOthernaNo definition available.No authoritative reference available.falsefalseMet Ed, Penelec And JCP&L99true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]100false0fe_RetrospectiveAssessmentsLiabilityfefalsenadurationRetrospective assessments liability.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00less than 1falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRetrospective assessments liability.No authoritative reference available.falsefalseRetrospective assessments liability101false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse23falsefalsetruefalse{fe_CommitmentsMeasurementUnitsAxis} : Tons [Member] 1/1/2010 - 12/31/2010 TwelveMonthsEnded_31Dec2010_Tons_Memberhttp://www.sec.gov/CIK0001031296duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseTons [Member]fe_CommitmentsMeasurementUnitsAxisxbrldihttp://xbrl.org/2006/xbrldife_TonsMemberfe_CommitmentsMeasurementUnitsAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseTons [Member]102true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]103false0fe_CappingOfGasOneEmissionsfefalsenainstantCapping of SO2 emissions.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse25000002500000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalCapping of SO2 emissions.No authoritative reference available.falsefalseCapping of SO2 emissions (In Tons)104false0fe_CappingOfGasTwoEmissionsfefalsenainstantCapping of NOx emissions.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse13000001300000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalCapping of NOx emissions.No authoritative reference available.falsefalseCapping of NOx emissions (In Tons)105false0fe_CapAndTradeProgramToReduceMercuryEmissionsAfterOneYearfefalsenainstantCap-and-trade program to reduce mercury emissions after one year.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse3838falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerCap-and-trade program to reduce mercury emissions after one year.No authoritative reference available.falsefalseCap-and-trade program to reduce mercury emissions by 2010 (In Tons)106false0fe_CapAndTradeProgramToReduceMercuryEmissionsAfterNineYearsfefalsenainstantCap-and-trade program to reduce mercury emissions after nine years.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse1515falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerCap-and-trade program to reduce mercury emissions after nine years.No authoritative reference available.falsefalseCap-and-trade program to reduce mercury emissions by 2018 (In Tons)107false0fe_UppperThresholdLimitForCarbonDiOxideEmissionfefalsenainstantUppper threshold limit for carbon di oxide emission.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse7500075000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerUppper threshold limit for carbon di oxide emission.No authoritative reference available.falsefalseUppper threshold limit for carbon di oxide emission (Tons per Year)108false0fe_CappingOfGasOneEmissionsUnderCleanAirTransportRulefefalsenadurationCapping of SO2 emissions under Clean Air Transport Rules.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse26000002600000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalCapping of SO2 emissions under Clean Air Transport Rules.No authoritative reference available.falsefalseCapping Of Gas One Emissions Under Clean Air Transport Rule109false0fe_CappingOfGasTwoEmissionsUnderCleanAirTransportRulefefalsenadurationCapping of gas two emissions under clean air transport rule.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse13000001300000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalCapping of gas two emissions under clean air transport rule.No authoritative reference available.falsefalseCapping of NOx emissions under CATR110false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse24falsefalsetruefalse{fe_CommitmentsMeasurementUnitsAxis} : Days [Member] 12/31/2010 BalanceAsOf_31Dec2010_Days_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDays [Member]fe_CommitmentsMeasurementUnitsAxisxbrldihttp://xbrl.org/2006/xbrldife_DaysMemberfe_CommitmentsMeasurementUnitsAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseDays [Member]111true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]112false0fe_NoticeLetterRequiredfefalsenainstantNotice letter, required.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse6060falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerNotice letter, required.No authoritative reference available.falsefalseNumber of days required prior to the filing of a citizen suit under notice113false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/disclosurecommitmentsguaranteesandcontingenciesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse25falsefalsetruefalse{fe_CommitmentsMeasurementUnitsAxis} : Percent [Member] 1/1/2010 - 12/31/2010 TwelveMonthsEnded_31Dec2010_Percent_Memberhttp://www.sec.gov/CIK0001031296duration2010-01-01T00:00:002010-12-31T00:00:00falsefalsePercent [Member]fe_CommitmentsMeasurementUnitsAxisxbrldihttp://xbrl.org/2006/xbrldife_PercentMemberfe_CommitmentsMeasurementUnitsAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalsePercent [Member]114true0fe_CommitmentsGuaranteesAndContingenciesTextualsAbstractfefalsenadurationCommitments Guarantees and Contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments Guarantees and Contingencies.falsefalseCommitments, Guarantees and Contingencies (Textuals) [Abstract]115false0fe_FormerOwnershipOfSubsidiaryInWorkUnitfefalsenainstantFormer ownership of Subsidiary in Work Unit.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truetruefalse0.16670.1667falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFormer ownership of Subsidiary in Work Unit.No authoritative reference available.falsefalseJCP&L former owning in Keystone Station and Penelec (In Percentage)116false0fe_PercentChangeInConfidenceLevelOverOneYearfefalsenainstantPercent change in confidence level over one year.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truetruefalse0.950.95falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepurePercent change in confidence level over one year.No authoritative reference available.falsefalsePercent change in confidence level over one year117false0fe_ProposedGreenhouseGasEmissionsReductionByTwentyFiftyfefalsenadurationProposed greenhouse gas emissions reduction by 2050.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truetruefalse0.800.80falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureProposed greenhouse gas emissions reduction by 2050.No authoritative reference available.falsefalseProposed Greenhouse Gas emissions reduction by Twenty Fifty4116Commitments, Guarantees and Contingencies (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue