<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.3.0.11</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ReportType />
  <ContextCount>1202</ContextCount>
  <ElementCount>526</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>157</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>true</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0110 - Statement - Consolidated Statements of Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StatementConsolidatedStatementsOfIncomeUnaudited</Role>
      <ShortName>Consolidated Statements of Income (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0111 - Statement - Consolidated Statements of Income (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StatementConsolidatedStatementsOfIncomeUnauditedParenthetical</Role>
      <ShortName>Consolidated Statements of Income (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0120 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StatementsOfComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0130 - Statement - Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StatementConsolidatedBalanceSheetsUnaudited</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0131 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StatementConsolidatedBalanceSheetsUnauditedParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0140 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StatementConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0201 - Disclosure - Organization and Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureOrganizationAndBasisOfPresentation</Role>
      <ShortName>Organization and Basis of Presentation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0202 - Disclosure - Merger</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/Merger</Role>
      <ShortName>Merger</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0203 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0204 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/FairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value Measurements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0205 - Disclosure - Derivative Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DerivativeInstruments</Role>
      <ShortName>Derivative Instruments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0206 - Disclosure - Pension and Other Postretirement Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosurePensionAndOtherPostretirementBenefits</Role>
      <ShortName>Pension and Other Postretirement Benefits</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0207 - Disclosure - Variable Interest Entities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureVariableInterestEntities</Role>
      <ShortName>Variable Interest Entities</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0208 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0209 - Disclosure - Commitments, Guarantees and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureCommitmentsGuaranteesAndContingencies</Role>
      <ShortName>Commitments, Guarantees and Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0210 - Disclosure - Regulatory Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/RegulatoryMatters</Role>
      <ShortName>Regulatory Matters</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0211 - Disclosure - Stock Based Compensation Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StockBasedCompensationPlans</Role>
      <ShortName>Stock Based Compensation Plans</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0212 - Disclosure - New Accounting Standards and Interpretations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/NewAccountingStandardsAndInterpretations</Role>
      <ShortName>New Accounting Standards and Interpretations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0213 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureSegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0214 - Disclosure - Impairment of Long-Lived Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/ImpairmentOfLongLivedAssets</Role>
      <ShortName>Impairment of Long-Lived Assets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0215 - Disclosure - Asset Retirement Obligations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/AssetRetirementObligations</Role>
      <ShortName>Asset Retirement Obligations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>0216 - Disclosure - Supplemental Guarantor Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureSupplementalGuarantorInformation</Role>
      <ShortName>Supplemental Guarantor Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>0412 - Disclosure - New Accounting Standards and Interpretations (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/NewAccountingStandardsAndInterpretationsPolicies</Role>
      <ShortName>New Accounting Standards and Interpretations (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>0502 - Disclosure - Merger (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/MergerTables</Role>
      <ShortName>Merger (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>0503 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>0504 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureFairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>0505 - Disclosure - Derivative Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureDerivativeInstrumentsTables</Role>
      <ShortName>Derivative Instruments (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>0506 - Disclosure - Pension and Other Postretirement Benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosurePensionAndOtherPostretirementBenefitsTables</Role>
      <ShortName>Pension and Other Postretirement Benefits (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>0507 - Disclosure - Variable Interest Entities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureVariableInterestEntitiesTables</Role>
      <ShortName>Variable Interest Entities (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>0511 - Disclosure - Stock-Based Compensation Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StockBasedCompensationPlansTables</Role>
      <ShortName>Stock-Based Compensation Plans (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>0513 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureSegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>0516 - Disclosure - Supplemental Guarantor Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureSupplementalGuarantorInformationTables</Role>
      <ShortName>Supplemental Guarantor Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>0602 - Disclosure - Merger (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/MergerDetails</Role>
      <ShortName>Merger (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>06021 - Disclosure - Merger (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/MergerDetails1</Role>
      <ShortName>Merger (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>06022 - Disclosure - Merger (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/MergerDetails2</Role>
      <ShortName>Merger (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>06023 - Disclosure - Merger (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/MergerDetails3</Role>
      <ShortName>Merger (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>06024 - Disclosure - Merger (Details 4)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/MergerDetails4</Role>
      <ShortName>Merger (Details 4)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>06025 - Disclosure - Merger (Details 5)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/MergerDetails5</Role>
      <ShortName>Merger (Details 5)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>06026 - Disclosure - Merger (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/MergerDetailsTextuals</Role>
      <ShortName>Merger (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>0603 - Disclosure - Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/EarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>0604 - Disclosure - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/FairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value Measurements (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>06041 - Disclosure - Fair Value Measurements (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/FairValueOfFinancialInstrumentsDetails1</Role>
      <ShortName>Fair Value Measurements (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>06042 - Disclosure - Fair Value Measurements (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/FairValueOfFinancialInstrumentsDetails2</Role>
      <ShortName>Fair Value Measurements (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>06043 - Disclosure - Fair Value Measurements (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/FairValueOfFinancialInstrumentsDetails3</Role>
      <ShortName>Fair Value Measurements (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>06044 - Disclosure - Fair Value Measurements (Details 4)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/FairValueOfFinancialInstrumentsDetails4</Role>
      <ShortName>Fair Value Measurements (Details 4)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>06045 - Disclosure - Fair Value Measurements (Details 5)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/FairValueOfFinancialInstrumentsDetails5</Role>
      <ShortName>Fair Value Measurements (Details 5)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>06046 - Disclosure - Fair Value Measurements (Details 6)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/FairValueOfFinancialInstrumentsDetails6</Role>
      <ShortName>Fair Value Measurements (Details 6)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>06047 - Disclosure - Fair Value Measurements (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/FairValueOfFinancialInstrumentsDetailsTextuals</Role>
      <ShortName>Fair Value Measurements (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>0605 - Disclosure - Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DerivativeInstrumentsDetails</Role>
      <ShortName>Derivative Instruments (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>06051 - Disclosure - Derivative Instruments (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DerivativeInstrumentsDetails1</Role>
      <ShortName>Derivative Instruments (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>06052 - Disclosure - Derivative Instruments (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DerivativeInstrumentsDetails2</Role>
      <ShortName>Derivative Instruments (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>06053 - Disclosure - Derivative Instruments (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DerivativeInstrumentsDetails3</Role>
      <ShortName>Derivative Instruments (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>06054 - Disclosure - Derivative Instruments (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DerivativeInstrumentsDetailsTextuals</Role>
      <ShortName>Derivative Instruments (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>0606 - Disclosure - Pension and Other Postretirement Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/PensionAndOtherPostretirementBenefitPlansDetails</Role>
      <ShortName>Pension and Other Postretirement Benefits (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>06061 - Disclosure - Pension and Other Postretirement Benefits (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/PensionAndOtherPostretirementBenefitPlansDetails1</Role>
      <ShortName>Pension and Other Postretirement Benefits (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>06062 - Disclosure - Pension and Other Postretirement Benefits (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/PensionAndOtherPostretirementBenefitPlansDetailsTextuals</Role>
      <ShortName>Pension and Other Postretirement Benefits (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>0607 - Disclosure - Variable Interest Entities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureVariableInterestEntitiesDetails</Role>
      <ShortName>Variable Interest Entities (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>06071 - Disclosure - Variable Interest Entities (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/VariableInterestEntitiesDetails1</Role>
      <ShortName>Variable Interest Entities (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>0608 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/IncomeTaxesDetailsTextuals</Role>
      <ShortName>Income Taxes (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>0609 - Disclosure - Commitments, Guarantees and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/CommitmentsGuaranteesAndContingenciesDetails</Role>
      <ShortName>Commitments, Guarantees and Contingencies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>0610 - Disclosure - Regulatory Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureRegulatoryMattersDetails</Role>
      <ShortName>Regulatory Matters (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>0611 - Disclosure - Stock-Based Compensation Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StockBasedCompensationPlansDetails</Role>
      <ShortName>Stock-Based Compensation Plans (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>06111 - Disclosure - Stock-Based Compensation Plans (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StockBasedCompensationPlans1Details</Role>
      <ShortName>Stock-Based Compensation Plans (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>06112 - Disclosure - Stock-Based Compensation Plans (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StockBasedCompensationPlans2Details</Role>
      <ShortName>Stock-Based Compensation Plans (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>06113 - Disclosure - Stock-Based Compensation Plans (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/StockBasedCompensationPlansDetailsTextuals</Role>
      <ShortName>Stock-Based Compensation Plans (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>0613 - Disclosure - Segment Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/SegmentInformationDetails</Role>
      <ShortName>Segment Information (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>06131 - Disclosure - Segment Information (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/SegmentInformationDetailsTextuals</Role>
      <ShortName>Segment Information (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>0614 - Disclosure - Impairment of Long-Lived Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/ImpairmentOfLongLivedAssetsDetails</Role>
      <ShortName>Impairment of Long-Lived Assets (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>0615 - Disclosure - Asset Retirement Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/AssetRetirementObligationsDetails</Role>
      <ShortName>Asset Retirement Obligations (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>0616 - Disclosure - Supplemental Guarantor Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/DisclosureSupplementalGuarantorInformationDetails</Role>
      <ShortName>Supplemental Guarantor Information (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>06161 - Disclosure - Supplemental Guarantor Information (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/SupplementalGuarantorInformationDetails1</Role>
      <ShortName>Supplemental Guarantor Information (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>06162 - Disclosure - Supplemental Guarantor Information (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/SupplementalGuarantorInformationDetails2</Role>
      <ShortName>Supplemental Guarantor Information (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>06163 - Disclosure - Supplemental Guarantor Information (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://firstenergycorp.com/role/SupplementalGuarantorInformationDetailsTextuals</Role>
      <ShortName>Supplemental Guarantor Information (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element us-gaap_ElectricDomesticRegulatedRevenue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ElectricUtilityRevenue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CostOfPurchasedPower had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherCostAndExpenseOperating had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_DepreciationNonproduction had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AmortizationOfRegulatoryAsset had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_TaxesExcludingIncomeAndExciseTaxes had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CostsAndExpenses had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OperatingIncomeLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_InvestmentIncomeInterestAndDividend had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherNonoperatingIncomeExpense had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_InterestAndDebtExpense had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NonoperatingIncomeExpense had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncomeTaxExpenseBenefit had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProfitLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetIncomeLossAttributableToNoncontrollingInterest had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetIncomeLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProfitLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecrease had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPeriodIncreaseDecrease had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentBeforeTaxPeriodIncreaseDecrease had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecrease had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherComprehensiveIncomeLossTax had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetIncomeLossAttributableToNoncontrollingInterest had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ComprehensiveIncomeNetOfTax had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CashAndCashEquivalentsAtCarryingValue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccountsReceivableNetCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccountsReceivableRelatedPartiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherReceivables had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_InventoryNet had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NotesReceivableRelatedPartiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PrepaidTaxes had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherAssetsCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AssetsCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PropertyPlantAndEquipmentGross had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_NetPlantExcludingConstructionWorkInProgress had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ConstructionInProgressGross had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PropertyPlantAndEquipmentNet had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_DecommissioningFundInvestments had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_HeldToMaturitySecuritiesNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_NuclearFuelDisposalTrust had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherLongTermInvestments had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LongTermInvestments had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_Goodwill had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_RegulatoryAssetsNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_PropertyTaxes had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_UnamortizedSaleAndLeasebackCosts had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherAssetsNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AssetsNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_Assets had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ShortTermNonBankLoansAndNotesPayable had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ShortTermBorrowings had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccountsPayableRelatedPartiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccountsPayableCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccruedIncomeTaxesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccruedEmployeeBenefitsCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherLiabilitiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LiabilitiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CommonStockValueOutstanding had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AdditionalPaidInCapitalCommonStock had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_RetainedEarningsAccumulatedDeficit had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_StockholdersEquity had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_MinorityInterest had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LongTermDebtAndCapitalLeaseObligations had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CapitalizationLongtermDebtAndEquity had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_DeferredTaxLiabilitiesNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AssetRetirementObligationsNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OffMarketLeaseUnfavorable had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherLiabilitiesNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LiabilitiesNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LiabilitiesAndStockholdersEquity had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProfitLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_DepreciationNonproduction had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AmortizationOfRegulatoryAsset had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_DeferredPurchasedPowerCosts had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_DeferredIncomeTaxesAndTaxCredits had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_DeferredRentsAndLeaseMarketValuationLiability had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PensionContributions had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncreaseDecreaseInDepositsOutstanding had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncreaseDecreaseInPrepaidExpense had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncreaseDecreaseInAccountsPayableTrade had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncreaseDecreaseInInterestPayableNet had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetCashProvidedByUsedInOperatingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromIssuanceOfLongTermDebt had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromShortTermDebt had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_RepaymentsOfLongTermDebt had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_RepaymentsOfShortTermDebt had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsOfDividendsCommonStock had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromPaymentsForOtherFinancingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetCashProvidedByUsedInFinancingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsToAcquireProductiveAssets had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsToAcquireAvailableForSaleSecurities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_LeaseholdImprovementPaymentsToAssociatedCompanies had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsForProceedsFromInvestments had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromPaymentsForLongTermLoansForRelatedParties had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsForProceedsFromOtherInvestingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetCashProvidedByUsedInInvestingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CashAndCashEquivalentsAtCarryingValue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CashAndCashEquivalentsAtCarryingValue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_Goodwill had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_Goodwill had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ElectricUtilityRevenue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProfitLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetIncomeLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LongTermDebtAndCapitalLeaseObligations had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_LossesToBeAmortizedToInterestExpensesDuringNextTwelveMonths had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AdditionalCollateralAggregateFairValue had a mix of decimals attribute values: -5 -6.</Log>
    <Log type="Info">Element us-gaap_CostOfPurchasedPower had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetIncomeLossAttributableToNoncontrollingInterest had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AdditionalCollateralAggregateFairValue had a mix of decimals attribute values: -5 -6.</Log>
    <Log type="Info">Element us-gaap_AllocatedShareBasedCompensationExpense had a mix of decimals attribute values: -5 -6.</Log>
    <Log type="Info">Element us-gaap_ElectricUtilityRevenue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_InvestmentIncomeInterestAndDividend had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncomeTaxExpenseBenefit had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProfitLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_Assets had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_Goodwill had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsToAcquireProductiveAssets had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ElectricUtilityRevenue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CostOfPurchasedPower had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherCostAndExpenseOperating had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_DepreciationNonproduction had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_TaxesExcludingIncomeAndExciseTaxes had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CostsAndExpenses had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OperatingIncomeLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_InvestmentIncomeInterestAndDividend had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_InterestAndDebtExpense had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NonoperatingIncomeExpense had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_IncomeTaxExpenseBenefit had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProfitLoss had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CashAndCashEquivalentsAtCarryingValue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccountsReceivableNetCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccountsReceivableRelatedPartiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherReceivables had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NotesReceivableRelatedPartiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_InventoryNet had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherAssetsCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AssetsCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PropertyPlantAndEquipmentGross had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_NetPlantExcludingConstructionWorkInProgress had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ConstructionInProgressGross had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PropertyPlantAndEquipmentNet had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_DecommissioningFundInvestments had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherLongTermInvestments had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LongTermInvestments had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_Goodwill had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_PropertyTaxes had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_UnamortizedSaleAndLeasebackCosts had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherAssetsNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AssetsNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_Assets had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ShortTermNonBankLoansAndNotesPayable had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ShortTermBorrowings had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccountsPayableRelatedPartiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AccountsPayableCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherLiabilitiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LiabilitiesCurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_StockholdersEquity had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LongTermDebtAndCapitalLeaseObligations had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CapitalizationLongtermDebtAndEquity had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_DeferredTaxLiabilitiesNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_AssetRetirementObligationsNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OffMarketLeaseUnfavorable had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_OtherLiabilitiesNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LiabilitiesNoncurrent had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_LiabilitiesAndStockholdersEquity had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetCashProvidedByUsedInOperatingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromIssuanceOfLongTermDebt had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromShortTermDebt had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_RepaymentsOfLongTermDebt had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_RepaymentsOfShortTermDebt had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsOfDividendsCommonStock had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromPaymentsForOtherFinancingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetCashProvidedByUsedInFinancingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsToAcquireProductiveAssets had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsToAcquireAvailableForSaleSecurities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromPaymentsForLongTermLoansForRelatedParties had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element fe_LeaseholdImprovementPaymentsToAssociatedCompanies had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_PaymentsForProceedsFromOtherInvestingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_NetCashProvidedByUsedInInvestingActivities had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CashAndCashEquivalentsAtCarryingValue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">Element us-gaap_CashAndCashEquivalentsAtCarryingValue had a mix of decimals attribute values: -3 -6.</Log>
    <Log type="Info">'Monetary' elements on report '0110 - Statement - Consolidated Statements of Income (Unaudited)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0130 - Statement - Consolidated Balance Sheets (Unaudited)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0140 - Statement - Consolidated Statements of Cash Flows (Unaudited)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Shares' elements on report '0602 - Disclosure - Merger (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06021 - Disclosure - Merger (Details 1)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06054 - Disclosure - Derivative Instruments (Details Textuals)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06071 - Disclosure - Variable Interest Entities (Details Textuals)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0609 - Disclosure - Commitments, Guarantees and Contingencies (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0610 - Disclosure - Regulatory Matters (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0613 - Disclosure - Segment Information (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0616 - Disclosure - Supplemental Guarantor Information (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06161 - Disclosure - Supplemental Guarantor Information (Details 1)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06162 - Disclosure - Supplemental Guarantor Information (Details 2)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 0110 - Statement - Consolidated Statements of Income (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0111 - Statement - Consolidated Statements of Income (Unaudited) (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0120 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0130 - Statement - Consolidated Balance Sheets (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Jun. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 0131 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0140 - Statement - Consolidated Statements of Cash Flows (Unaudited)</Log>
  </Logs>
  <InputFiles>
    <File>fe-20110630.xml</File>
    <File>fe-20110630.xsd</File>
    <File>fe-20110630_cal.xml</File>
    <File>fe-20110630_def.xml</File>
    <File>fe-20110630_lab.xml</File>
    <File>fe-20110630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
