2.2.0.25truefalse0604 - Disclosure - Fair Value of Financial Instruments (Details)truefalseIn Thousandsfalse1falsefalseUSDfalsefalse3/31/2011 USD ($) USD ($) / shares $BalanceAsOf_31Mar2011http://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0MWHStandardhttp://firstenergycorp.com/2011-03-31MWHfe0USDUSD$2falsefalseUSDfalsefalse12/31/2010 USD ($) $BalanceAsOf_31Dec2010http://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations3false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1753500000017535000falsetruefalsefalsefalse2truefalsefalse1257900000012579000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations4false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$4falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseFES5true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations6false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse31449970003144997falsefalsefalsefalsefalse2truefalsefalse31808750003180875falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations7false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Carrying_Reported_Amount_Fair_Value_Disclosure_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Carrying_Reported_Amount_Fair_Value_Disclosure_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseFES | Carrying Value8true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations9false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse40990000004099000falsefalsefalsefalsefalse2truefalsefalse42790000004279000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations10false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse7falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseFES | Fair Value11true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations12false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse42270000004227000falsefalsefalsefalsefalse2truefalsefalse44030000004403000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations13false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse9falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Oe_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Oe_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseOE | Carrying Value14true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations15false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse11590000001159000falsefalsefalsefalsefalse2truefalsefalse11590000001159000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations16false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse11falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Oe_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$12falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Oe_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseOE | Fair Value17true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations18false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse13340000001334000falsefalsefalsefalsefalse2truefalsefalse13210000001321000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations19false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse13falsefalseUSDtruefalse{dei_LegalEntityAxis} : CEI [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Cei_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseCEIdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_CeiMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$14falsefalseUSDtruefalse{dei_LegalEntityAxis} : CEI [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Cei_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseCEIdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_CeiMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseCEI | Carrying Value20true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations21false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse18310000001831000falsefalsefalsefalsefalse2truefalsefalse18530000001853000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations22false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse15falsefalseUSDtruefalse{dei_LegalEntityAxis} : CEI [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Cei_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseCEIdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_CeiMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$16falsefalseUSDtruefalse{dei_LegalEntityAxis} : CEI [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Cei_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseCEIdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_CeiMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseCEI | Fair Value23true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations24false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse20350000002035000falsefalsefalsefalsefalse2truefalsefalse20350000002035000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations25false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse17falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$18falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseTE | Carrying Value26true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations27false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse600000000600000falsefalsefalsefalsefalse2truefalsefalse600000000600000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations28false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse19falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$20falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseTE | Fair Value29true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations30false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse666000000666000falsefalsefalsefalsefalse2truefalsefalse653000000653000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations31false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse21falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$22falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseJCP&L | Carrying Value32true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations33false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse18020000001802000falsefalsefalsefalsefalse2truefalsefalse18100000001810000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations34false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse23falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$24falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseJCP&L | Fair Value35true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations36false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse19770000001977000falsefalsefalsefalsefalse2truefalsefalse19620000001962000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations37false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse25falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$26falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseMet-Ed | Carrying Value38true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations39false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse742000000742000falsefalsefalsefalsefalse2truefalsefalse742000000742000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations40false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse27falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$28falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseMet-Ed | Fair Value41true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations42false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse826000000826000falsefalsefalsefalsefalse2truefalsefalse821000000821000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations43false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse29falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penelec [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penelec_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalsePenelecdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PenelecMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$30falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penelec [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penelec_Member_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalsePenelecdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PenelecMemberdei_LegalEntityAxisexplicitMemberfalsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalsePenelec | Carrying Value44true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations45false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse11200000001120000falsefalsefalsefalsefalse2truefalsefalse11200000001120000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations46false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse31falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penelec [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penelec_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalsePenelecdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PenelecMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$32falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penelec [Member] {us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penelec_Member_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalsePenelecdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PenelecMemberdei_LegalEntityAxisexplicitMemberfalsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalsePenelec | Fair Value47true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations48false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse11900000001190000falsefalsefalsefalsefalse2truefalsefalse11890000001189000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations49false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse33falsefalseUSDtruefalse{us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$34falsefalseUSDtruefalse{us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Carrying Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Carrying_Reported_Amount_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseCarrying Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CarryingReportedAmountFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseCarrying Value50true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations51false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1874300000018743000falsefalsefalsefalsefalse2truefalsefalse1392800000013928000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations52false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://firstenergycorp.com/role/fairvalueoffinancialinstrumentsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse35falsefalseUSDtruefalse{us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$36falsefalseUSDtruefalse{us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis} : Fair Value [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Estimate_Of_Fair_Value_Fair_Value_Disclosure_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFair Valueus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EstimateOfFairValueFairValueDisclosureMemberus-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseFair Value53true0fe_FairValueAndRelatedCarryingAmountsOfLongTermDebtAndOtherLongTermObligationsAbstractfefalsenadurationFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFair value and related carrying amounts of long-term debt and other long-term obligations.falsefalseFair value and related carrying amounts of long-term debt and other long-term obligations54false0us-gaap_LongTermDebtAndCapitalLeaseObligationsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1977300000019773000falsetruefalsefalsefalse2truefalsefalse1484500000014845000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H falsefalseLong-term debt and other long-term obligations253Fair Value of Financial Instruments (Details) (USD $)ThousandsUnKnownUnKnownUnKnownfalsetrue