2.2.0.7 true Regulatory Matters (Details) (USD $) 00610 - Disclosure - Regulatory Matters (Details) true false In Millions false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Tons Standard http://firstenergycorp.com/20100331 tons fe 0 Percent Standard http://www.xbrl.org/2003/instance pure xbrli 0 kV Standard http://firstenergycorp.com/20100331 kV fe 0 Customers Standard http://firstenergycorp.com/20100331 Customers fe 0 Days Standard http://firstenergycorp.com/20100331 Days fe 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 false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 kV Standard http://firstenergycorp.com/20100331 kV fe 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 3 false false MWH Standard http://firstenergycorp.com/20100331 MWH fe 0 false 4 false false Percent Standard http://www.xbrl.org/2003/instance pure xbrli 0 MWH Standard http://firstenergycorp.com/20100331 MWH fe 0 false 5 false false MWH Standard http://firstenergycorp.com/20100331 MWH fe 0 false 6 USD false false MWH Standard http://firstenergycorp.com/20100331 MWH fe 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 7 USD false false MWH Standard http://firstenergycorp.com/20100331 MWH fe 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 8 false false Percent Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 9 false false Percent Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 10 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Tons Standard http://firstenergycorp.com/20100331 tons fe 0 Percent Standard http://www.xbrl.org/2003/instance pure xbrli 0 MWH Standard http://firstenergycorp.com/20100331 MWH fe 0 Generating_Facilities Standard http://firstenergycorp.com/20100331 Generating_Facilities fe 0 Square_Miles Standard http://firstenergycorp.com/20100331 Square_Miles fe 0 Gallons Standard http://firstenergycorp.com/20100331 Gallons fe 0 mmBTU Standard http://firstenergycorp.com/20100331 mmBTU fe 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 3 Increase electric distribution rates 2 fe_IncreaseElectricDistributionRates fe false debit instant Increase electric distribution rates. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 true true false false 136600000 136.6 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Increase electric distribution rates. No authoritative reference available. false 4 Total annual energy savings 2 fe_TotalAnnualEnergySavings fe false na duration Total annual energy savings. 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 false false false 3 false true false false 530000 530000 false false false 4 false true false false 470000 470000 false false false 5 false true false false 410000 410000 false false false 6 false true false false 290000 290000 false false false 7 false true false false 166000 166000 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:integerItemType integer Total annual energy savings. No authoritative reference available. false 5 Utilities required to reduce peak demand in 2009 (In Percentage) 2 fe_UtilitiesRequiredToReducePeakDemand fe false na duration Utilities required to reduce peak demand in 2009 in percentage. false false false false false false false false false false false verboselabel false 1 false true false false 1 1 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:pureItemType pure Utilities required to reduce peak demand in 2009 in percentage. No authoritative reference available. false 6 Utilities required to additional reduction in peak demand through 2018 2 fe_UtilitiesRequiredToReducePeakDemandFromTwoThousandTenToTwoThousandEighteen fe false na duration Utilities Required to Reduce Peak Demand From 2010 To 2018 in percentage false false false false false false false false false false false verboselabel false 1 false false false false 0 0 <p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Arial;font-size:9pt;margin-left:0px;">0</font><font style="font-family:Arial;font-size:9pt;">.75</font></p> false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false us-types:textBlockItemType textblock Utilities Required to Reduce Peak Demand From 2010 To 2018 in percentage No authoritative reference available. false 7 Transmission cost projections 2 fe_ProjectedTransmissionCost fe false debit duration Projected Transmission Cost. false false false false false false false false false false false verboselabel false 1 false true false false 199700000 199.7 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Projected Transmission Cost. No authoritative reference available. false 8 Minimum reduction in Utilities peak demand (In Percentage) 2 fe_MinimumReductionInUtilitiesPeakDemand fe false na instant Minimum reduction in Utilities peak demand. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false true false false 4.5 4.5 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false us-types:percentItemType pure Minimum reduction in Utilities peak demand. No authoritative reference available. false 9 Minimum reduction in Utilities reduce energy consumption (In Percentage) 2 fe_MinimumReductionInUtilitiesReduceEnergyConsumption fe false na instant Minimum reduction in Utilities reduce energy consumption. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false true false false 3 3 false false false 9 false true false false 1 1 false false false 10 false false false false 0 0 false false false us-types:percentItemType pure Minimum reduction in Utilities reduce energy consumption. No authoritative reference available. false 10 Deferred accumulated cost, total 2 fe_DeferredAccumulatedCostTotal fe false credit instant Deferred accumulated cost, total. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false true false false 81000000 81 false false false xbrli:monetaryItemType monetary Deferred accumulated cost, total. No authoritative reference available. false 11 Updated estimated decommissioning costs 2 fe_UpdatedEstimatedDecommissioningCosts fe false debit instant Updated estimated decommissioning costs. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false true false false 729000000 729 false false false xbrli:monetaryItemType monetary Updated estimated decommissioning costs. No authoritative reference available. false 12 Previously estimated decommissioning costs 2 fe_PreviouslyEstimatedDecommissioningCosts fe false debit instant Previously estimated decommissioning costs. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false true false false 528000000 528 false false false xbrli:monetaryItemType monetary Previously estimated decommissioning costs. No authoritative reference available. false 14 New Voltage transmission facilities across PJM and a zonal transmission rate (In KV) 2 fe_NewVoltageTransmissionFacilitiesZonalTransmissionRate fe false na duration New Voltage transmission facilities and zonal transmission rate. false false false false false false false false false false false verboselabel false 1 false true false false 500 500 false false false 2 false true false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:integerItemType integer New Voltage transmission facilities and zonal transmission rate. No authoritative reference available. false 15 Assessment period costs 2 fe_AssessmentPeriodCosts fe false debit duration Assessment period costs. false false false false false false false false false false false false 1 false true false false 29500000 29.5 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Assessment period costs. No authoritative reference available. false 16 Underpayment by PJM 2007 - 2009 2 fe_UnderpaymentByPJM2007Thru2009 fe false debit duration Underpayment by PJM 2007 - 2009 false false false false false false false false false false false false 1 false true false false 75000000 75 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Underpayment by PJM 2007 - 2009 No authoritative reference available. false 17 Underpayment by PJM 2005 - 2007 2 fe_UnderpaymentByPJM2005Thru2007 fe false debit duration Underpayment by PJM 2005 - 2007. false false false false false false false false false false false false 1 false true false false 12000000 12 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Underpayment by PJM 2005 - 2007. No authoritative reference available. false 18 Regulatory asset impairment related to ESP 2 fe_RegulatoryAssetImpairmentRelatedToESP fe false credit instant Regulatory asset impairment related to ESP. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false true false false 39500000 39.5 false false false xbrli:monetaryItemType monetary Regulatory asset impairment related to ESP. No authoritative reference available. false 19 Costs avoided by customers 2 fe_CostsAvoidedByCustomers fe false debit duration Costs avoided by customers. false false false false false false false false false false false false 1 false true false false 360000000 360 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Costs avoided by customers. No authoritative reference available. false 20 Fund to assist low income customers 2 fe_FundToAssistLowIncomeCustomers fe false debit duration Fund to assist low income customers. false false false false false false false false false false false false 1 false true false false 12000000 12 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Fund to assist low income customers. No authoritative reference available. false 21 Generation discount for low income customers 2 fe_GenerationDiscountForLowIncomeCustomers fe false na duration Generation discount for low income customers. false false false false false false false false false false false false 1 false true false false 6 6 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false us-types:percentItemType pure Generation discount for low income customers. No authoritative reference available. false 22 PUCO review of MRO (In Days) 2 fe_PUCOReviewOfMROInDays fe false na duration PUCO review of MRO in days. false false false false false false false false false false false false 1 false true false false 90 90 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:integerItemType integer PUCO review of MRO in days. No authoritative reference available. false 23 Responsive comments (In Days) 2 fe_ResponsiveCommentsInDays fe false na duration Responsive comments in days. false false false false false false false false false false false false 1 false true false false 45 45 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:integerItemType integer Responsive comments in days. No authoritative reference available. false 24 Reply comments (In Days) 2 fe_ReplyCommentsInDays fe false na duration Reply comments in days. false false false false false false false false false false false false 1 false true false false 30 30 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:integerItemType integer Reply comments in days. No authoritative reference available. false 25 Decrease in the amount recovered for the costs incurred 2 fe_DecreaseInTheAmountRecoveredForTheCostsIncurred fe false credit duration Decrease in the amount recovered for the costs incurred. false false false false false false false false false false false false 1 false true false false 180000000 180 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Decrease in the amount recovered for the costs incurred. No authoritative reference available. false 26 Regional allocation of costs 2 fe_RegionalAllocationOfCosts fe false na duration Regional allocation of costs. false false false false false false false false false false false false 1 false true false false 100 100 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false us-types:percentItemType pure Regional allocation of costs. No authoritative reference available. false 27 Revised decommisioning costs 2 fe_RevisedDecommisioningCosts fe false debit duration Revised decommisioning costs. false false false false false false false false false false false false 1 false true false false 736000000 736 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Revised decommisioning costs. No authoritative reference available. false 28 Market flow PJM generators 2 fe_MarketFlowGenerators fe false na duration Market flow generators. false false false false false false false false false false false verboselabel false 1 false true false false 34 34 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:integerItemType integer Market flow generators. No authoritative reference available. false 29 Net underpayments from PJM to MISO 2 fe_NetUnderpayments fe false credit duration Net underpayments. false false false false false false false false false false false verboselabel false 1 false true false false 130000000 130 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net underpayments. No authoritative reference available. false 30 Transformerand Distibutionline [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 11 USD true false false false Transformerand Distibutionline [Member] us-gaap_PublicUtilityAxis xbrldi http://xbrl.org/2006/xbrldi fe_TransformerandDistibutionlineMember us-gaap_PublicUtilityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 31 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 42 Infrastructure and energy projects 2 fe_InfrastructureAndEnergyProjects fe false debit instant Infrastructure and energy projects. false false false false false false false false false false false verboselabel false 1 false true false false 40000000 40 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Infrastructure and energy projects. No authoritative reference available. false 59 Existing Program [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 12 USD true false false false Existing Program [Member] us-gaap_PublicUtilityAxis xbrldi http://xbrl.org/2006/xbrldi fe_ExistingProgramMember us-gaap_PublicUtilityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 60 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 71 Infrastructure and energy projects 2 fe_InfrastructureAndEnergyProjects fe false debit instant Infrastructure and energy projects. false false false false false false false false false false false verboselabel false 1 false true false false 34000000 34 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Infrastructure and energy projects. No authoritative reference available. false 88 Transformerand Capicitor [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 13 USD true false false false Transformerand Capicitor [Member] us-gaap_PublicUtilityAxis xbrldi http://xbrl.org/2006/xbrldi fe_TransformerandCapicitorMember us-gaap_PublicUtilityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 89 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 100 Infrastructure and energy projects 2 fe_InfrastructureAndEnergyProjects fe false debit instant Infrastructure and energy projects. false false false false false false false false false false false verboselabel false 1 false true false false 11000000 11 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Infrastructure and energy projects. No authoritative reference available. false 117 Current Program [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 14 USD true false false false Current Program [Member] us-gaap_PublicUtilityAxis xbrldi http://xbrl.org/2006/xbrldi fe_CurrentProgramMember us-gaap_PublicUtilityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 118 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 129 Infrastructure and energy projects 2 fe_InfrastructureAndEnergyProjects fe false debit instant Infrastructure and energy projects. false false false false false false false false false false false verboselabel false 1 false true false false 13000000 13 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Infrastructure and energy projects. No authoritative reference available. false 146 CEI [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 15 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 $ na No definition available. No authoritative reference available. false 147 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 148 Increase electric distribution rates 2 fe_IncreaseElectricDistributionRates fe false debit instant Increase electric distribution rates. false false false false false false false false false false false verboselabel false 1 false true false false 29200000 29.2 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Increase electric distribution rates. No authoritative reference available. false 175 TE [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 16 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 $ na No definition available. No authoritative reference available. false 176 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 177 Increase electric distribution rates 2 fe_IncreaseElectricDistributionRates fe false debit instant Increase electric distribution rates. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false true false false 38500000 38.5 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Increase electric distribution rates. No authoritative reference available. false 204 JCP&L [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 17 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 $ na No definition available. No authoritative reference available. false 205 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 216 Infrastructure and energy projects 2 fe_InfrastructureAndEnergyProjects fe false debit instant Infrastructure and energy projects. false false false false false false false false false false false verboselabel false 1 false true false false 98000000 98 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Infrastructure and energy projects. No authoritative reference available. false 233 Met-Ed [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 18 USD true false false false Met-Ed [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiaryFiveMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 234 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 239 Transmission cost projections 2 fe_ProjectedTransmissionCost fe false debit duration Projected Transmission Cost. false false false false false false false false false false false verboselabel false 1 false true false false 158500000 158.5 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Projected Transmission Cost. No authoritative reference available. false 262 Penelec [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 19 USD true false false false Penelec [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiarySixMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 263 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 268 Transmission cost projections 2 fe_ProjectedTransmissionCost fe false debit duration Projected Transmission Cost. false false false false false false false false false false false verboselabel false 1 false true false false 41200000 41.2 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Projected Transmission Cost. No authoritative reference available. false 291 OE [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosureregulatorymattersdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 20 USD true false false false OE [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiaryOneMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 292 Regulatory Matters (Textuals) 2 fe_RegulatoryMattersTextualsAbstract fe false na duration Regulatory Matters. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:stringItemType string Regulatory Matters. false 293 Increase electric distribution rates 2 fe_IncreaseElectricDistributionRates fe false debit instant Increase electric distribution rates. 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 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 true true false false 68900000 68.9 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Increase electric distribution rates. No authoritative reference available. false 10 57 false HundredThousands UnKnown UnKnown false true