2.2.0.25truefalse06045 - Disclosure - Fair Value of Financial Instruments (Details 5)truefalseIn Millionsfalse1falsefalseUSDfalsefalse3/31/2011 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$3falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fes_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$9falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$11falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$12falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Foreign_Government_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$13falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Foreign_Government_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$14falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$15falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$16falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Other_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$17falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Other_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$18falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis} : Ftrs [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fes_Member_Fair_Value_Inputs_Level1_Member_Ftrs_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseFTRsus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisxbrldihttp://xbrl.org/2006/xbrldife_FtrsMemberus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$19falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Oe_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$20falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Oe_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$21falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_U_S_Government_Agencies_Debt_Securities_Member_Oe_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$22falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Agencies_Debt_Securities_Member_Oe_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$23falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Other_Securities_Member_Oe_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$24falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Other_Securities_Member_Oe_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$25falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$26falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$27falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$28falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$29falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$30falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$31falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$32falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$33falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Te_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$34falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$35falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$36falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$37falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$38falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$39falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$40falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$41falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$42falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$43falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$44falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$45falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$46falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$47falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$48falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$49falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$50falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$51falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$52falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$53falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$54falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$55falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$56falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$57falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$58falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$59falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$60falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$61falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$62falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$63falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$64falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Foreign_Government_Debt_Securities_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$65falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$66falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$67falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$68falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$69falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$70falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$71falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$72falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$73falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$74falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2009 USD ($) $BalanceAsOf_31Dec2009_Penn_Member_Fair_Value_Inputs_Level1_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$75falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$76falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$77falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$78falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$79falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$80falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$81falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$82falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$83falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$84falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$85falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$86falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$87falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$88falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$89falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level1_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$90falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level1_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$91falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$92falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$93falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$94falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$95falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$96falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$97falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$98falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$99falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$100falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$101falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$102falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$103falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$104falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level1_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$105falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Interest Rate Swap [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Interest_Rate_Swap_Member_Fair_Value_Inputs_Level1_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseInterest Rate Swap [Member]us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_InterestRateSwapMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$106falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level1 [Member] {us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis} : Ftrs [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level1_Member_Ftrs_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 1fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseFTRsus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisxbrldihttp://xbrl.org/2006/xbrldife_FtrsMemberus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$107falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$108falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$109falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fes_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$110falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$111falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$112falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$113falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$114falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$115falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$116falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Foreign_Government_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$117falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Foreign_Government_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$118falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$119falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$120falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Other_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$121falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Other_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$122falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis} : Ftrs [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fes_Member_Fair_Value_Inputs_Level2_Member_Ftrs_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseFTRsus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisxbrldihttp://xbrl.org/2006/xbrldife_FtrsMemberus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$123falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Oe_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$124falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Oe_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$125falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_U_S_Government_Agencies_Debt_Securities_Member_Oe_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$126falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Agencies_Debt_Securities_Member_Oe_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$127falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Other_Securities_Member_Oe_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$128falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Other_Securities_Member_Oe_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$129falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$130falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$131falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$132falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$133falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$134falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$135falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$136falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$137falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Te_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$138falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$139falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$140falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$141falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$142falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$143falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$144falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$145falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$146falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$147falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$148falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$149falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$150falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$151falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$152falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$153falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$154falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$155falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$156falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$157falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$158falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$159falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$160falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$161falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$162falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$163falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$164falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$165falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$166falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$167falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$168falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Foreign_Government_Debt_Securities_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$169falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$170falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$171falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$172falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$173falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$174falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$175falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$176falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$177falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$178falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2009 USD ($) $BalanceAsOf_31Dec2009_Penn_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$179falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$180falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$181falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$182falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$183falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$184falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$185falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$186falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$187falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$188falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$189falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$190falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$191falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$192falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$193falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level2_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$194falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level2_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$195falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$196falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$197falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$198falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$199falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$200falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$201falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$202falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$203falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$204falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$205falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$206falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$207falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$208falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level2_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$209falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Interest Rate Swap [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Interest_Rate_Swap_Member_Fair_Value_Inputs_Level2_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseInterest Rate Swap [Member]us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_InterestRateSwapMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$210falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 2 [Member] {us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis} : Ftrs [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level2_Member_Ftrs_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 2fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseFTRsus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisxbrldihttp://xbrl.org/2006/xbrldife_FtrsMemberus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$211falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$212falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$213falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fes_Member_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$214falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$215falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$216falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$217falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$218falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$219falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$220falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Foreign_Government_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$221falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Foreign_Government_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$222falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$223falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$224falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Other_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$225falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Other_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$226falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis} : Ftrs [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fes_Member_Fair_Value_Inputs_Level3_Member_Ftrs_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseFTRsus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisxbrldihttp://xbrl.org/2006/xbrldife_FtrsMemberus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$227falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Oe_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$228falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Oe_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$229falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_U_S_Government_Agencies_Debt_Securities_Member_Oe_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$230falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Agencies_Debt_Securities_Member_Oe_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$231falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Other_Securities_Member_Oe_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$232falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Other_Securities_Member_Oe_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$233falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$234falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$235falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$236falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$237falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$238falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$239falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$240falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$241falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Te_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$242falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$243falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$244falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$245falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$246falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$247falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$248falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$249falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$250falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$251falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$252falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$253falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$254falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$255falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$256falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$257falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$258falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$259falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$260falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$261falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$262falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$263falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$264falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$265falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$266falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$267falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$268falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$269falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$270falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$271falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$272falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Foreign_Government_Debt_Securities_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$273falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$274falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$275falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$276falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$277falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$278falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$279falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$280falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$281falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$282falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2009 USD ($) $BalanceAsOf_31Dec2009_Penn_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$283falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$284falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$285falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$286falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level3_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$287falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$288falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$289falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$290falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$291falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$292falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$293falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$294falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$295falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$296falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$297falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level3_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$298falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level3_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$299falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$300falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$301falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$302falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$303falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$304falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$305falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$306falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$307falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$308falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$309falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$310falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$311falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$312falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fair_Value_Inputs_Level3_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$313falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Interest Rate Swap [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Interest_Rate_Swap_Member_Fair_Value_Inputs_Level3_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseInterest Rate Swap [Member]us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_InterestRateSwapMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$314falsefalseUSDtruefalse{fe_FairValueNetAssetsMeasuredOnRecurringBasisAxis} : Fair Value Inputs Level 3 [Member] {us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis} : Ftrs [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fair_Value_Inputs_Level3_Member_Ftrs_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseLevel 3fe_FairValueNetAssetsMeasuredOnRecurringBasisAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberfe_FairValueNetAssetsMeasuredOnRecurringBasisAxisexplicitMemberfalsefalseFTRsus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisxbrldihttp://xbrl.org/2006/xbrldife_FtrsMemberus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$315falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] 3/31/2011 USD ($) $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$316falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] 12/31/2010 USD ($) $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$317falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$318falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$319falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fes_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$320falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_U_S_Government_Agencies_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$321falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Agencies_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$322falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$323falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$324falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Foreign_Government_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$325falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Foreign_Government_Debt_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$326falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Commodity_Contract_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$327falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Commodity_Contract_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$328falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Other_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$329falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Other_Securities_Member_Fes_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$330falsefalseUSDtruefalse{dei_LegalEntityAxis} : FES [Member] {us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis} : Ftrs [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fes_Member_Ftrs_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFESdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_FesMemberdei_LegalEntityAxisexplicitMemberfalsefalseFTRsus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisxbrldihttp://xbrl.org/2006/xbrldife_FtrsMemberus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$331falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$332falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$333falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$334falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$335falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Equity_Securities_Member_Te_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$336falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$337falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$338falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$339falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Sponsored_Enterprises_Debt_Securities_Member_Te_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$340falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Te_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$341falsefalseUSDtruefalse{dei_LegalEntityAxis} : TE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Te_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseTEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_TeMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$342falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$343falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$344falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$345falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$346falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$347falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$348falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$349falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$350falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$351falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$352falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$353falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$354falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$355falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$356falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$357falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Jcp_And_L_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$358falsefalseUSDtruefalse{dei_LegalEntityAxis} : Jcp And L Member {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Jcp_And_L_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseJCP&Ldei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_JcpAndLMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$359falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Oe_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$360falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Oe_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$361falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_U_S_Government_Agencies_Debt_Securities_Member_Oe_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$362falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Agencies_Debt_Securities_Member_Oe_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$363falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Other_Securities_Member_Oe_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$364falsefalseUSDtruefalse{dei_LegalEntityAxis} : OE [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Other_Securities_Member_Oe_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOEdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_OeMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$365falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$366falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$367falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$368falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$369falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$370falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$371falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$372falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$373falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$374falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$375falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$376falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$377falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$378falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$379falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$380falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Non_Utility_Generation_Contract_Member_2http://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$381falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Met_Ed_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$382falsefalseUSDtruefalse{dei_LegalEntityAxis} : Met-Ed [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Met_Ed_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMet-Eddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_MetEdMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$383falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$384falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2009 USD ($) $BalanceAsOf_31Dec2009_Penn_Member_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$385falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {dei_LegalEntityAxis} : Penn [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$386falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] {dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberfalsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$387falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$388falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$389falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$390falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$391falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$392falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$393falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$394falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$395falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$396falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$397falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Penn_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$398falsefalseUSDtruefalse{dei_LegalEntityAxis} : Penn [Member] {us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Penn_Member_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalsePenndei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldife_PennMemberdei_LegalEntityAxisexplicitMemberfalsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$399falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$400falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Equity_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseEquity Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$401falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Debt_Securities_Member_2http://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$402falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Corporate Debt Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Debt_Securities_Member_2http://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$403falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$404falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : U.S. government debt securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Agencies_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseU.S. government debt securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$405falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$406falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by states of the U.S. [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_U_S_Government_Sponsored_Enterprises_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt securities issued by states of the U.Sus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$407falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$408falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt securities issued by foreign governments [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Foreign_Government_Debt_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseDebt securities issued by foreign governmentsus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignGovernmentDebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$409falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$410falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Commodity Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Commodity_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseCommodity Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommodityContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$411falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Non_Utility_Generation_Contract_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$412falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Non Utility Generation Contract [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Non_Utility_Generation_Contract_Member_2http://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseNon Utility Generation Contractus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_NonUtilityGenerationContractMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$413falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$414falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Other Securities [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Other_Securities_Memberhttp://www.sec.gov/CIK0001031296instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOther Securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldife_OtherSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$415falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Interest Rate Swap [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Interest_Rate_Swap_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseInterest Rate Swap [Member]us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_InterestRateSwapMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$416falsefalseUSDtruefalse{us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis} : Ftrs [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Ftrs_Memberhttp://www.sec.gov/CIK0001031296instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFTRsus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisxbrldihttp://xbrl.org/2006/xbrldife_FtrsMemberus-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170MWHStandardhttp://firstenergycorp.com/2011-03-31MWHfe0USDUSD$2true0fe_FairValueAssetsMeasuredOnRecurringBasisAbstractfefalsenadurationFair value assets measured on recurring basis.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalse43falsefalsefalse00falsefalsefalsetruefalse44falsefalsefalse00falsefalsefalsetruefalse45falsefalsefalse00falsefalsefalsetruefalse46falsefalsefalse00falsefalsefalsetruefalse47falsefalsefalse00falsefalsefalsetruefalse48falsefalsefalse00falsefalsefalsetruefalse49falsefalsefalse00falsefalsefalsetruefalse50falsefalsefalse00falsefalsefalsetruefalse51falsefalsefalse00falsefalsefalsetruefalse52falsefalsefalse00falsefalsefalsetruefalse53falsefalsefalse00falsefalsefalsetruefalse54falsefalsefalse00falsefalsefalsetruefalse55falsefalsefalse00falsefalsefalsetruefalse56falsefalsefalse00falsefalsefalsetruefalse57falsefalsefalse00falsefalsefalsetruefalse58falsefalsefalse00falsefalsefalsetruefalse59falsefalsefalse00falsefalsefalsetruefalse60falsefalsefalse00falsefalsefalsetruefalse61falsefalsefalse00falsefalsefalsetruefalse62falsefalsefalse00falsefalsefalsetruefalse63falsefalsefalse00falsefalsefalsetruefalse64falsefalsefalse00falsefalsefalsetruefalse65falsefalsefalse00falsefalsefalsetruefalse66falsefalsefalse00falsefalsefalsetruefalse67falsefalsefalse00falsefalsefalsetruefalse68falsefalsefalse00falsefalsefalsetruefalse69falsefalsefalse00falsefalsefalsetruefalse70falsefalsefalse00falsefalsefalsetruefalse71falsefalsefalse00falsefalsefalsetruefalse72falsefalsefalse00falsefalsefalsetruefalse73falsefalsefalse00falsefalsefalsetruefalse74falsefalsefalse00falsefalsefalsetruefalse75falsefalsefalse00falsefalsefalsetruefalse76falsefalsefalse00falsefalsefalsetruefalse77falsefalsefalse00falsefalsefalsetruefalse78falsefalsefalse00falsefalsefalsetruefalse79falsefalsefalse00falsefalsefalsetruefalse80falsefalsefalse00falsefalsefalsetruefalse81falsefalsefalse00falsefalsefalsetruefalse82falsefalsefalse00falsefalsefalsetruefalse83falsefalsefalse00falsefalsefalsetruefalse84falsefalsefalse00falsefalsefalsetruefalse85falsefalsefalse00falsefalsefalsetruefalse86falsefalsefalse00falsefalsefalsetruefalse87falsefalsefalse00falsefalsefalsetruefalse88falsefalsefalse00falsefalsefalsetruefalse89falsefalsefalse00falsefalsefalsetruefalse90falsefalsefalse00falsefalsefalsetruefalse91falsefalsefalse00falsefalsefalsetruefalse92falsefalsefalse00falsefalsefalsetruefalse93falsefalsefalse00falsefalsefalsetruefalse94falsefalsefalse00falsefalsefalsetruefalse95falsefalsefalse00falsefalsefalsetruefalse96falsefalsefalse00falsefalsefalsetruefalse97falsefalsefalse00falsefalsefalsetruefalse98falsefalsefalse00falsefalsefalsetruefalse99falsefalsefalse00falsefalsefalsetruefalse100falsefalsefalse00falsefalsefalsetruefalse101falsefalsefalse00falsefalsefalsetruefalse102falsefalsefalse00falsefalsefalsetruefalse103falsefalsefalse00falsefalsefalsetruefalse104falsefalsefalse00falsefalsefalsetruefalse105falsefalsefalse00falsefalsefalsetruefalse106falsefalsefalse00falsefalsefalsetruefalse107falsefalsefalse00falsefalsefalsetruefalse108falsefalsefalse00falsefalsefalsetruefalse109falsefalsefalse00falsefalsefalsetruefalse110falsefalsefalse00falsefalsefalsetruefalse111falsefalsefalse00falsefalsefalsetruefalse112falsefalsefalse00falsefalsefalsetruefalse113falsefalsefalse00falsefalsefalsetruefalse114falsefalsefalse00falsefalsefalsetruefalse115falsefalsefalse00falsefalsefalsetruefalse116falsefalsefalse00falsefalsefalsetruefalse117falsefalsefalse00falsefalsefalsetruefalse118falsefalsefalse00falsefalsefalsetruefalse119falsefalsefalse00falsefalsefalsetruefalse120falsefalsefalse00falsefalsefalsetruefalse121falsefalsefalse00falsefalsefalsetruefalse122falsefalsefalse00falsefalsefalsetruefalse123falsefalsefalse00falsefalsefalsetruefalse124falsefalsefalse00falsefalsefalsetruefalse125falsefalsefalse00falsefalsefalsetruefalse126falsefalsefalse00falsefalsefalsetruefalse127falsefalsefalse00falsefalsefalsetruefalse128falsefalsefalse00falsefalsefalsetruefalse129falsefalsefalse00falsefalsefalsetruefalse130falsefalsefalse00falsefalsefalsetruefalse131falsefalsefalse00falsefalsefalsetruefalse132falsefalsefalse00falsefalsefalsetruefalse133falsefalsefalse00falsefalsefalsetruefalse134falsefalsefalse00falsefalsefalsetruefalse135falsefalsefalse00falsefalsefalsetruefalse136falsefalsefalse00falsefalsefalsetruefalse137falsefalsefalse00falsefalsefalsetruefalse138falsefalsefalse00falsefalsefalsetruefalse139falsefalsefalse00falsefalsefalsetruefalse140falsefalsefalse00falsefalsefalsetruefalse141falsefalsefalse00falsefalsefalsetruefalse142falsefalsefalse00falsefalsefalsetruefalse143falsefalsefalse00falsefalsefalsetruefalse144falsefalsefalse00falsefalsefalsetruefalse145falsefalsefalse00falsefalsefalsetruefalse146falsefalsefalse00falsefalsefalsetruefalse147falsefalsefalse00falsefalsefalsetruefalse148falsefalsefalse00falsefalsefalsetruefalse149falsefalsefalse00falsefalsefalsetruefalse150falsefalsefalse00falsefalsefalsetruefalse151falsefalsefalse00falsefalsefalsetruefalse152falsefalsefalse00falsefalsefalsetruefalse153falsefalsefalse00falsefalsefalsetruefalse154falsefalsefalse00falsefalsefalsetruefalse155falsefalsefalse00falsefalsefalsetruefalse156falsefalsefalse00falsefalsefalsetruefalse157falsefalsefalse00falsefalsefalsetruefalse158falsefalsefalse00falsefalsefalsetruefalse159falsefalsefalse00falsefalsefalsetruefalse160falsefalsefalse00falsefalsefalsetruefalse161falsefalsefalse00falsefalsefalsetruefalse162falsefalsefalse00falsefalsefalsetruefalse163falsefalsefalse00falsefalsefalsetruefalse164falsefalsefalse00falsefalsefalsetruefalse165falsefalsefalse00falsefalsefalsetruefalse166falsefalsefalse00falsefalsefalsetruefalse167falsefalsefalse00falsefalsefalsetruefalse168falsefalsefalse00falsefalsefalsetruefalse169falsefalsefalse00falsefalsefalsetruefalse170falsefalsefalse00falsefalsefalsetruefalse171falsefalsefalse00falsefalsefalsetruefalse172falsefalsefalse00falsefalsefalsetruefalse173falsefalsefalse00falsefalsefalsetruefalse174falsefalsefalse00falsefalsefalsetruefalse175falsefalsefalse00falsefalsefalsetruefalse176falsefalsefalse00falsefalsefalsetruefalse177falsefalsefalse00falsefalsefalsetruefalse178falsefalsefalse00falsefalsefalsetruefalse179falsefalsefalse00falsefalsefalsetruefalse180falsefalsefalse00falsefalsefalsetruefalse181falsefalsefalse00falsefalsefalsetruefalse182falsefalsefalse00falsefalsefalsetruefalse183falsefalsefalse00falsefalsefalsetruefalse184falsefalsefalse00falsefalsefalsetruefalse185falsefalsefalse00falsefalsefalsetruefalse186falsefalsefalse00falsefalsefalsetruefalse187falsefalsefalse00falsefalsefalsetruefalse188falsefalsefalse00falsefalsefalsetruefalse189falsefalsefalse00falsefalsefalsetruefalse190falsefalsefalse00falsefalsefalsetruefalse191falsefalsefalse00falsefalsefalsetruefalse192falsefalsefalse00falsefalsefalsetruefalse193falsefalsefalse00falsefalsefalsetruefalse194falsefalsefalse00falsefalsefalsetruefalse195falsefalsefalse00falsefalsefalsetruefalse196falsefalsefalse00falsefalsefalsetruefalse197falsefalsefalse00falsefalsefalsetruefalse198falsefalsefalse00falsefalsefalsetruefalse199falsefalsefalse00falsefalsefalsetruefalse200falsefalsefalse00falsefalsefalsetruefalse201falsefalsefalse00falsefalsefalsetruefalse202falsefalsefalse00falsefalsefalsetruefalse203falsefalsefalse00falsefalsefalsetruefalse204falsefalsefalse00falsefalsefalsetruefalse205falsefalsefalse00falsefalsefalsetruefalse206falsefalsefalse00falsefalsefalsetruefalse207falsefalsefalse00falsefalsefalsetruefalse208falsefalsefalse00falsefalsefalsetruefalse209falsefalsefalse00falsefalsefalsetruefalse210falsefalsefalse00falsefalsefalsetruefalse211falsefalsefalse00falsefalsefalsetruefalse212falsefalsefalse00falsefalsefalsetruefalse213falsefalsefalse00falsefalsefalsetruefalse214falsefalsefalse00falsefalsefalsetruefalse215falsefalsefalse00falsefalsefalsetruefalse216falsefalsefalse00falsefalsefalsetruefalse217falsefalsefalse00falsefalsefalsetruefalse218falsefalsefalse00falsefalsefalsetruefalse219falsefalsefalse00falsefalsefalsetruefalse220falsefalsefalse00falsefalsefalsetruefalse221falsefalsefalse00falsefalsefalsetruefalse222falsefalsefalse00falsefalsefalsetruefalse223falsefalsefalse00falsefalsefalsetruefalse224falsefalsefalse00falsefalsefalsetruefalse225falsefalsefalse00falsefalsefalsetruefalse226falsefalsefalse00falsefalsefalsetruefalse227falsefalsefalse00falsefalsefalsetruefalse228falsefalsefalse00falsefalsefalsetruefalse229falsefalsefalse00falsefalsefalsetruefalse230falsefalsefalse00falsefalsefalsetruefalse231falsefalsefalse00falsefalsefalsetruefalse232falsefalsefalse00falsefalsefalsetruefalse233falsefalsefalse00falsefalsefalsetruefalse234falsefalsefalse00falsefalsefalsetruefalse235falsefalsefalse00falsefalsefalsetruefalse236falsefalsefalse00falsefalsefalsetruefalse237falsefalsefalse00falsefalsefalsetruefalse238falsefalsefalse00falsefalsefalsetruefalse239falsefalsefalse00falsefalsefalsetruefalse240falsefalsefalse00falsefalsefalsetruefalse241falsefalsefalse00falsefalsefalsetruefalse242falsefalsefalse00falsefalsefalsetruefalse243falsefalsefalse00falsefalsefalsetruefalse244falsefalsefalse00falsefalsefalsetruefalse245falsefalsefalse00falsefalsefalsetruefalse246falsefalsefalse00falsefalsefalsetruefalse247falsefalsefalse00falsefalsefalsetruefalse248falsefalsefalse00falsefalsefalsetruefalse249falsefalsefalse00falsefalsefalsetruefalse250falsefalsefalse00falsefalsefalsetruefalse251falsefalsefalse00falsefalsefalsetruefalse252falsefalsefalse00falsefalsefalsetruefalse253falsefalsefalse00falsefalsefalsetruefalse254falsefalsefalse00falsefalsefalsetruefalse255falsefalsefalse00falsefalsefalsetruefalse256falsefalsefalse00falsefalsefalsetruefalse257falsefalsefalse00falsefalsefalsetruefalse258falsefalsefalse00falsefalsefalsetruefalse259falsefalsefalse00falsefalsefalsetruefalse260falsefalsefalse00falsefalsefalsetruefalse261falsefalsefalse00falsefalsefalsetruefalse262falsefalsefalse00falsefalsefalsetruefalse263falsefalsefalse00falsefalsefalsetruefalse264falsefalsefalse00falsefalsefalsetruefalse265falsefalsefalse00falsefalsefalsetruefalse266falsefalsefalse00falsefalsefalsetruefalse267falsefalsefalse00falsefalsefalsetruefalse268falsefalsefalse00falsefalsefalsetruefalse269falsefalsefalse00falsefalsefalsetruefalse270falsefalsefalse00falsefalsefalsetruefalse271falsefalsefalse00falsefalsefalsetruefalse272falsefalsefalse00falsefalsefalsetruefalse273falsefalsefalse00falsefalsefalsetruefalse274falsefalsefalse00falsefalsefalsetruefalse275falsefalsefalse00falsefalsefalsetruefalse276falsefalsefalse00falsefalsefalsetruefalse277falsefalsefalse00falsefalsefalsetruefalse278falsefalsefalse00falsefalsefalsetruefalse279falsefalsefalse00falsefalsefalsetruefalse280falsefalsefalse00falsefalsefalsetruefalse281falsefalsefalse00falsefalsefalsetruefalse282falsefalsefalse00falsefalsefalsetruefalse283falsefalsefalse00falsefalsefalsetruefalse284falsefalsefalse00falsefalsefalsetruefalse285falsefalsefalse00falsefalsefalsetruefalse286falsefalsefalse00falsefalsefalsetruefalse287falsefalsefalse00falsefalsefalsetruefalse288falsefalsefalse00falsefalsefalsetruefalse289falsefalsefalse00falsefalsefalsetruefalse290falsefalsefalse00falsefalsefalsetruefalse291falsefalsefalse00falsefalsefalsetruefalse292falsefalsefalse00falsefalsefalsetruefalse293falsefalsefalse00falsefalsefalsetruefalse294falsefalsefalse00falsefalsefalsetruefalse295falsefalsefalse00falsefalsefalsetruefalse296falsefalsefalse00falsefalsefalsetruefalse297falsefalsefalse00falsefalsefalsetruefalse298falsefalsefalse00falsefalsefalsetruefalse299falsefalsefalse00falsefalsefalsetruefalse300falsefalsefalse00falsefalsefalsetruefalse301falsefalsefalse00falsefalsefalsetruefalse302falsefalsefalse00falsefalsefalsetruefalse303falsefalsefalse00falsefalsefalsetruefalse304falsefalsefalse00falsefalsefalsetruefalse305falsefalsefalse00falsefalsefalsetruefalse306falsefalsefalse00falsefalsefalsetruefalse307falsefalsefalse00falsefalsefalsetruefalse308falsefalsefalse00falsefalsefalsetruefalse309falsefalsefalse00falsefalsefalsetruefalse310falsefalsefalse00falsefalsefalsetruefalse311falsefalsefalse00falsefalsefalsetruefalse312falsefalsefalse00falsefalsefalsetruefalse313falsefalsefalse00falsefalsefalsetruefalse314falsefalsefalse00falsefalsefalsetruefalse315falsefalsefalse00falsefalsefalsetruefalse316falsefalsefalse00falsefalsefalsetruefalse317falsefalsefalse00falsefalsefalsetruefalse318falsefalsefalse00falsefalsefalsetruefalse319falsefalsefalse00falsefalsefalsetruefalse320falsefalsefalse00falsefalsefalsetruefalse321falsefalsefalse00falsefalsefalsetruefalse322falsefalsefalse00falsefalsefalsetruefalse323falsefalsefalse00falsefalsefalsetruefalse324falsefalsefalse00falsefalsefalsetruefalse325falsefalsefalse00falsefalsefalsetruefalse326falsefalsefalse00falsefalsefalsetruefalse327falsefalsefalse00falsefalsefalsetruefalse328falsefalsefalse00falsefalsefalsetruefalse329falsefalsefalse00falsefalsefalsetruefalse330falsefalsefalse00falsefalsefalsetruefalse331falsefalsefalse00falsefalsefalsetruefalse332falsefalsefalse00falsefalsefalsetruefalse333falsefalsefalse00falsefalsefalsetruefalse334falsefalsefalse00falsefalsefalsetruefalse335falsefalsefalse00falsefalsefalsetruefalse336falsefalsefalse00falsefalsefalsetruefalse337falsefalsefalse00falsefalsefalsetruefalse338falsefalsefalse00falsefalsefalsetruefalse339falsefalsefalse00falsefalsefalsetruefalse340falsefalsefalse00falsefalsefalsetruefalse341falsefalsefalse00falsefalsefalsetruefalse342falsefalsefalse00falsefalsefalsetruefalse343falsefalsefalse00falsefalsefalsetruefalse344falsefalsefalse00falsefalsefalsetruefalse345falsefalsefalse00falsefalsefalsetruefalse346falsefalsefalse00falsefalsefalsetruefalse347falsefalsefalse00falsefalsefalsetruefalse348falsefalsefalse00falsefalsefalsetruefalse349falsefalsefalse00falsefalsefalsetruefalse350falsefalsefalse00falsefalsefalsetruefalse351falsefalsefalse00falsefalsefalsetruefalse352falsefalsefalse00falsefalsefalsetruefalse353falsefalsefalse00falsefalsefalsetruefalse354falsefalsefalse00falsefalsefalsetruefalse355falsefalsefalse00falsefalsefalsetruefalse356falsefalsefalse00falsefalsefalsetruefalse357falsefalsefalse00falsefalsefalsetruefalse358falsefalsefalse00falsefalsefalsetruefalse359falsefalsefalse00falsefalsefalsetruefalse360falsefalsefalse00falsefalsefalsetruefalse361falsefalsefalse00falsefalsefalsetruefalse362falsefalsefalse00falsefalsefalsetruefalse363falsefalsefalse00falsefalsefalsetruefalse364falsefalsefalse00falsefalsefalsetruefalse365falsefalsefalse00falsefalsefalsetruefalse366falsefalsefalse00falsefalsefalsetruefalse367falsefalsefalse00falsefalsefalsetruefalse368falsefalsefalse00falsefalsefalsetruefalse369falsefalsefalse00falsefalsefalsetruefalse370falsefalsefalse00falsefalsefalsetruefalse371falsefalsefalse00falsefalsefalsetruefalse372falsefalsefalse00falsefalsefalsetruefalse373falsefalsefalse00falsefalsefalsetruefalse374falsefalsefalse00falsefalsefalsetruefalse375falsefalsefalse00falsefalsefalsetruefalse376falsefalsefalse00falsefalsefalsetruefalse377falsefalsefalse00falsefalsefalsetruefalse378falsefalsefalse00falsefalsefalsetruefalse379falsefalsefalse00falsefalsefalsetruefalse380falsefalsefalse00falsefalsefalsetruefalse381falsefalsefalse00falsefalsefalsetruefalse382falsefalsefalse00falsefalsefalsetruefalse383falsefalsefalse00falsefalsefalsetruefalse384falsefalsefalse00falsefalsefalsetruefalse385falsefalsefalse00falsefalsefalsetruefalse386falsefalsefalse00falsefalsefalsetruefalse387falsefalsefalse00falsefalsefalsetruefalse388falsefalsefalse00falsefalsefalsetruefalse389falsefalsefalse00falsefalsefalsetruefalse390falsefalsefalse00falsefalsefalsetruefalse391falsefalsefalse00falsefalsefalsetruefalse392falsefalsefalse00falsefalsefalsetruefalse393falsefalsefalse00falsefalsefalsetruefalse394falsefalsefalse00falsefalsefalsetruefalse395falsefalsefalse00falsefalsefalsetruefalse396falsefalsefalse00falsefalsefalsetruefalse397falsefalsefalse00falsefalsefalsetruefalse398falsefalsefalse00falsefalsefalsetruefalse399falsefalsefalse00falsefalsefalsetruefalse400falsefalsefalse00falsefalsefalsetruefalse401falsefalsefalse00falsefalsefalsetruefalse402falsefalsefalse00falsefalsefalsetruefalse403falsefalsefalse00falsefalsefalsetruefalse404falsefalsefalse00falsefalsefalsetruefalse405falsefalsefalse00falsefalsefalsetruefalse406falsefalsefalse00falsefalsefalsetruefalse407falsefalsefalse00falsefalsefalsetruefalse408falsefalsefalse00falsefalsefalsetruefalse409falsefalsefalse00falsefalsefalsetruefalse410falsefalsefalse00falsefalsefalsetruefalse411falsefalsefalse00falsefalsefalsetruefalse412falsefalsefalse00falsefalsefalsetruefalse413falsefalsefalse00falsefalsefalsetruefalse414falsefalsefalse00falsefalsefalsetruefalse415falsefalsefalse00falsefalsefalsetruefalse416falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringFair value assets measured on recurring basis.falsefalseAssets3false0fe_FairValueAssetsMeasuredOnRecurringBasisfefalsedebitinstantFair Value Assets Measured On Recurring Basis.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse29930000002993falsetruefalsefalsefalse2truefalsefalse26490000002649falsetruefalsefalsefalse3truefalsefalse00falsetruefalsetruefalse4truefalsefalse00falsetruefalsetruefalse5truefalsefalse9300000093falsetruefalsetruefalse6truefalsefalse9300000093falsetruefalsetruefalse7truefalsefalse00falsetruefalsetruefalse8truefalsefalse00falsetruefalsetruefalse9truefalsefalse00falsetruefalsetruefalse10truefalsefalse00falsetruefalsetruefalse11truefalsefalse00falsetruefalsetruefalse12truefalsefalse00falsetruefalsetruefalse13truefalsefalse00falsetruefalsetruefalse14truefalsefalse00falsetruefalsetruefalse15truefalsefalse00falsetruefalsetruefalse16truefalsefalse00falsetruefalsetruefalse17truefalsefalse00falsetruefalsetruefalse18truefalsefalse00falsetruefalsetruefalse19truefalsefalse00falsetruefalsetruefalse20truefalsefalse00falsetruefalsetruefalse21truefalsefalse00falsetruefalsetruefalse22truefalsefalse00falsetruefalsetruefalse23truefalsefalse00falsetruefalsetruefalse24truefalsefalse00falsetruefalsetruefalse25truefalsefalse00falsetruefalsetruefalse26truefalsefalse00falsetruefalsetruefalse27truefalsefalse2500000025falsetruefalsetruefalse28truefalsefalse2500000025falsetruefalsetruefalse29truefalsefalse00falsetruefalsetruefalse30truefalsefalse00falsetruefalsetruefalse31truefalsefalse00falsetruefalsetruefalse32truefalsefalse00falsetruefalsetruefalse33truefalsefalse00falsetruefalsetruefalse34truefalsefalse00falsetruefalsetruefalse35truefalsefalse00falsetruefalsetruefalse36truefalsefalse00falsetruefalsetruefalse37truefalsefalse00falsetruefalsetruefalse38truefalsefalse2100000021falsetruefalsetruefalse39truefalsefalse9600000096falsetruefalsetruefalse40truefalsefalse2100000021falsetruefalsetruefalse41truefalsefalse9600000096falsetruefalsetruefalse42truefalsefalse00falsetruefalsetruefalse43truefalsefalse00falsetruefalsetruefalse44truefalsefalse00falsetruefalsetruefalse45truefalsefalse00falsetruefalsetruefalse46truefalsefalse00falsetruefalsetruefalse47truefalsefalse00falsetruefalsetruefalse48truefalsefalse00falsetruefalsetruefalse49truefalsefalse00falsetruefalsetruefalse50truefalsefalse00falsetruefalsetruefalse51truefalsefalse00falsetruefalsetruefalse52truefalsefalse00falsetruefalsetruefalse53truefalsefalse00falsetruefalsetruefalse54truefalsefalse00falsetruefalsetruefalse55truefalsefalse3400000034falsetruefalsetruefalse56truefalsefalse160000000160falsetruefalsetruefalse57truefalsefalse3400000034falsetruefalsetruefalse58truefalsefalse160000000160falsetruefalsetruefalse59truefalsefalse00falsetruefalsetruefalse60truefalsefalse00falsetruefalsetruefalse61truefalsefalse00falsetruefalsetruefalse62truefalsefalse00falsetruefalsetruefalse63truefalsefalse00falsetruefalsetruefalse64truefalsefalse00falsetruefalsetruefalse65truefalsefalse00falsetruefalsetruefalse66truefalsefalse00falsetruefalsetruefalse67truefalsefalse00falsetruefalsetruefalse68truefalsefalse00falsetruefalsetruefalse69truefalsefalse00falsetruefalsetruefalse70truefalsefalse00falsetruefalsetruefalse71truefalsefalse00falsetruefalsetruefalse72truefalsefalse00falsetruefalsetruefalse73truefalsefalse00falsetruefalsetruefalse74truefalsefalse00falsetruefalsetruefalse75truefalsefalse194000000194falsetruefalsetruefalse76truefalsefalse338000000338falsetruefalsetruefalse77truefalsefalse2000000020falsetruefalsetruefalse78truefalsefalse8100000081falsetruefalsetruefalse79truefalsefalse194000000194falsetruefalsetruefalse80truefalsefalse338000000338falsetruefalsetruefalse81truefalsefalse2000000020falsetruefalsetruefalse82truefalsefalse8100000081falsetruefalsetruefalse83truefalsefalse00falsetruefalsetruefalse84truefalsefalse00falsetruefalsetruefalse85truefalsefalse00falsetruefalsetruefalse86truefalsefalse00falsetruefalsetruefalse87truefalsefalse00falsetruefalsetruefalse88truefalsefalse00falsetruefalsetruefalse89truefalsefalse00falsetruefalsetruefalse90truefalsefalse00falsetruefalsetruefalse91truefalsefalse00falsetruefalsetruefalse92truefalsefalse00falsetruefalsetruefalse93truefalsefalse00falsetruefalsetruefalse94truefalsefalse00falsetruefalsetruefalse95truefalsefalse00falsetruefalsetruefalse96truefalsefalse00falsetruefalsetruefalse97truefalsefalse00falsetruefalsetruefalse98truefalsefalse00falsetruefalsetruefalse99truefalsefalse00falsetruefalsetruefalse100truefalsefalse00falsetruefalsetruefalse101truefalsefalse00falsetruefalsetruefalse102truefalsefalse00falsetruefalsetruefalse103truefalsefalse00falsetruefalsetruefalse104truefalsefalse00falsetruefalsetruefalse105truefalsefalse00falsetruefalsetruefalse106truefalsefalse00falsetruefalsetruefalse107truefalsefalse567000000567falsetruefalsetruefalse108truefalsefalse528000000528falsetruefalsetruefalse109truefalsefalse00falsetruefalsetruefalse110truefalsefalse15460000001546falsetruefalsetruefalse111truefalsefalse13780000001378falsetruefalsetruefalse112truefalsefalse304000000304falsetruefalsetruefalse113truefalsefalse308000000308falsetruefalsetruefalse114truefalsefalse80000008falsetruefalsetruefalse115truefalsefalse60000006falsetruefalsetruefalse116truefalsefalse-148000000-148falsetruefalsetruefalse117truefalsefalse147000000147falsetruefalsetruefalse118truefalsefalse476000000476falsetruefalsetruefalse119truefalsefalse241000000241falsetruefalsetruefalse120truefalsefalse4300000043falsetruefalsetruefalse121truefalsefalse148000000148falsetruefalsetruefalse122truefalsefalse00falsetruefalsetruefalse123truefalsefalse131000000131falsetruefalsetruefalse124truefalsefalse126000000126falsetruefalsetruefalse125truefalsefalse125000000125falsetruefalsetruefalse126truefalsefalse124000000124falsetruefalsetruefalse127truefalsefalse60000006falsetruefalsetruefalse128truefalsefalse20000002falsetruefalsetruefalse129truefalsefalse1600000016falsetruefalsetruefalse130truefalsefalse70000007falsetruefalsetruefalse131truefalsefalse00falsetruefalsetruefalse132truefalsefalse5300000053falsetruefalsetruefalse133truefalsefalse7600000076falsetruefalsetruefalse134truefalsefalse3200000032falsetruefalsetruefalse135truefalsefalse3300000033falsetruefalsetruefalse136truefalsefalse20000002falsetruefalsetruefalse137truefalsefalse10000001falsetruefalsetruefalse138truefalsefalse30000003falsetruefalsetruefalse139truefalsefalse3500000035falsetruefalsetruefalse140truefalsefalse9200000092falsetruefalsetruefalse141truefalsefalse2300000023falsetruefalsetruefalse142truefalsefalse00falsetruefalsetruefalse143truefalsefalse00falsetruefalsetruefalse144truefalsefalse383000000383falsetruefalsetruefalse145truefalsefalse298000000298falsetruefalsetruefalse146truefalsefalse6000000060falsetruefalsetruefalse147truefalsefalse3300000033falsetruefalsetruefalse148truefalsefalse214000000214falsetruefalsetruefalse149truefalsefalse236000000236falsetruefalsetruefalse150truefalsefalse10000001falsetruefalsetruefalse151truefalsefalse00falsetruefalsetruefalse152truefalsefalse20000002falsetruefalsetruefalse153truefalsefalse00falsetruefalsetruefalse154truefalsefalse00falsetruefalsetruefalse155truefalsefalse1600000016falsetruefalsetruefalse156truefalsefalse40000004falsetruefalsetruefalse157truefalsefalse131000000131falsetruefalsetruefalse158truefalsefalse3200000032falsetruefalsetruefalse159truefalsefalse00falsetruefalsetruefalse160truefalsefalse00falsetruefalsetruefalse161truefalsefalse272000000272falsetruefalsetruefalse162truefalsefalse142000000142falsetruefalsetruefalse163truefalsefalse100000000100falsetruefalsetruefalse164truefalsefalse8800000088falsetruefalsetruefalse165truefalsefalse20000002falsetruefalsetruefalse166truefalsefalse20000002falsetruefalsetruefalse167truefalsefalse-2000000-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-148000000-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-2000000-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:monetaryItemTypemonetaryFair Value Assets Measured On Recurring Basis.No authoritative reference available.falsefalseTotal4true0fe_FairValueLiabilitiesMeasuredOnRecurringBasisAbstractfefalsenadurationFair value liabilities measured on recurring basis.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalse43falsefalsefalse00falsefalsefalsetruefalse44falsefalsefalse00falsefalsefalsetruefalse45falsefalsefalse00falsefalsefalsetruefalse46falsefalsefalse00falsefalsefalsetruefalse47falsefalsefalse00falsefalsefalsetruefalse48falsefalsefalse00falsefalsefalsetruefalse49falsefalsefalse00falsefalsefalsetruefalse50falsefalsefalse00falsefalsefalsetruefalse51falsefalsefalse00falsefalsefalsetruefalse52falsefalsefalse00falsefalsefalsetruefalse53falsefalsefalse00falsefalsefalsetruefalse54falsefalsefalse00falsefalsefalsetruefalse55falsefalsefalse00falsefalsefalsetruefalse56falsefalsefalse00falsefalsefalsetruefalse57falsefalsefalse00falsefalsefalsetruefalse58falsefalsefalse00falsefalsefalsetruefalse59falsefalsefalse00falsefalsefalsetruefalse60falsefalsefalse00falsefalsefalsetruefalse61falsefalsefalse00falsefalsefalsetruefalse62falsefalsefalse00falsefalsefalsetruefalse63falsefalsefalse00falsefalsefalsetruefalse64falsefalsefalse00falsefalsefalsetruefalse65falsefalsefalse00falsefalsefalsetruefalse66falsefalsefalse00falsefalsefalsetruefalse67falsefalsefalse00falsefalsefalsetruefalse68falsefalsefalse00falsefalsefalsetruefalse69falsefalsefalse00falsefalsefalsetruefalse70falsefalsefalse00falsefalsefalsetruefalse71falsefalsefalse00falsefalsefalsetruefalse72falsefalsefalse00falsefalsefalsetruefalse73falsefalsefalse00falsefalsefalsetruefalse74falsefalsefalse00falsefalsefalsetruefalse75falsefalsefalse00falsefalsefalsetruefalse76falsefalsefalse00falsefalsefalsetruefalse77falsefalsefalse00falsefalsefalsetruefalse78falsefalsefalse00falsefalsefalsetruefalse79falsefalsefalse00falsefalsefalsetruefalse80falsefalsefalse00falsefalsefalsetruefalse81falsefalsefalse00falsefalsefalsetruefalse82falsefalsefalse00falsefalsefalsetruefalse83falsefalsefalse00falsefalsefalsetruefalse84falsefalsefalse00falsefalsefalsetruefalse85falsefalsefalse00falsefalsefalsetruefalse86falsefalsefalse00falsefalsefalsetruefalse87falsefalsefalse00falsefalsefalsetruefalse88falsefalsefalse00falsefalsefalsetruefalse89falsefalsefalse00falsefalsefalsetruefalse90falsefalsefalse00falsefalsefalsetruefalse91falsefalsefalse00falsefalsefalsetruefalse92falsefalsefalse00falsefalsefalsetruefalse93falsefalsefalse00falsefalsefalsetruefalse94falsefalsefalse00falsefalsefalsetruefalse95falsefalsefalse00falsefalsefalsetruefalse96falsefalsefalse00falsefalsefalsetruefalse97falsefalsefalse00falsefalsefalsetruefalse98falsefalsefalse00falsefalsefalsetruefalse99falsefalsefalse00falsefalsefalsetruefalse100falsefalsefalse00falsefalsefalsetruefalse101falsefalsefalse00falsefalsefalsetruefalse102falsefalsefalse00falsefalsefalsetruefalse103falsefalsefalse00falsefalsefalsetruefalse104falsefalsefalse00falsefalsefalsetruefalse105falsefalsefalse00falsefalsefalsetruefalse106falsefalsefalse00falsefalsefalsetruefalse107falsefalsefalse00falsefalsefalsetruefalse108falsefalsefalse00falsefalsefalsetruefalse109falsefalsefalse00falsefalsefalsetruefalse110falsefalsefalse00falsefalsefalsetruefalse111falsefalsefalse00falsefalsefalsetruefalse112falsefalsefalse00falsefalsefalsetruefalse113falsefalsefalse00falsefalsefalsetruefalse114falsefalsefalse00falsefalsefalsetruefalse115falsefalsefalse00falsefalsefalsetruefalse116falsefalsefalse00falsefalsefalsetruefalse117falsefalsefalse00falsefalsefalsetruefalse118falsefalsefalse00falsefalsefalsetruefalse119falsefalsefalse00falsefalsefalsetruefalse120falsefalsefalse00falsefalsefalsetruefalse121falsefalsefalse00falsefalsefalsetruefalse122falsefalsefalse00falsefalsefalsetruefalse123falsefalsefalse00falsefalsefalsetruefalse124falsefalsefalse00falsefalsefalsetruefalse125falsefalsefalse00falsefalsefalsetruefalse126falsefalsefalse00falsefalsefalsetruefalse127falsefalsefalse00falsefalsefalsetruefalse128falsefalsefalse00falsefalsefalsetruefalse129falsefalsefalse00falsefalsefalsetruefalse130falsefalsefalse00falsefalsefalsetruefalse131falsefalsefalse00falsefalsefalsetruefalse132falsefalsefalse00falsefalsefalsetruefalse133falsefalsefalse00falsefalsefalsetruefalse134falsefalsefalse00falsefalsefalsetruefalse135falsefalsefalse00falsefalsefalsetruefalse136falsefalsefalse00falsefalsefalsetruefalse137falsefalsefalse00falsefalsefalsetruefalse138falsefalsefalse00falsefalsefalsetruefalse139falsefalsefalse00falsefalsefalsetruefalse140falsefalsefalse00falsefalsefalsetruefalse141falsefalsefalse00falsefalsefalsetruefalse142falsefalsefalse00falsefalsefalsetruefalse143falsefalsefalse00falsefalsefalsetruefalse144falsefalsefalse00falsefalsefalsetruefalse145falsefalsefalse00falsefalsefalsetruefalse146falsefalsefalse00falsefalsefalsetruefalse147falsefalsefalse00falsefalsefalsetruefalse148falsefalsefalse00falsefalsefalsetruefalse149falsefalsefalse00falsefalsefalsetruefalse150falsefalsefalse00falsefalsefalsetruefalse151falsefalsefalse00falsefalsefalsetruefalse152falsefalsefalse00falsefalsefalsetruefalse153falsefalsefalse00falsefalsefalsetruefalse154falsefalsefalse00falsefalsefalsetruefalse155falsefalsefalse00falsefalsefalsetruefalse156falsefalsefalse00falsefalsefalsetruefalse157falsefalsefalse00falsefalsefalsetruefalse158falsefalsefalse00falsefalsefalsetruefalse159falsefalsefalse00falsefalsefalsetruefalse160falsefalsefalse00falsefalsefalsetruefalse161falsefalsefalse00falsefalsefalsetruefalse162falsefalsefalse00falsefalsefalsetruefalse163falsefalsefalse00falsefalsefalsetruefalse164falsefalsefalse00falsefalsefalsetruefalse165falsefalsefalse00falsefalsefalsetruefalse166falsefalsefalse00falsefalsefalsetruefalse167falsefalsefalse00falsefalsefalsetruefalse168falsefalsefalse00falsefalsefalsetruefalse169falsefalsefalse00falsefalsefalsetruefalse170falsefalsefalse00falsefalsefalsetruefalse171falsefalsefalse00falsefalsefalsetruefalse172falsefalsefalse00falsefalsefalsetruefalse173falsefalsefalse00falsefalsefalsetruefalse174falsefalsefalse00falsefalsefalsetruefalse175falsefalsefalse00falsefalsefalsetruefalse176falsefalsefalse00falsefalsefalsetruefalse177falsefalsefalse00falsefalsefalsetruefalse178falsefalsefalse00falsefalsefalsetruefalse179falsefalsefalse00falsefalsefalsetruefalse180falsefalsefalse00falsefalsefalsetruefalse181falsefalsefalse00falsefalsefalsetruefalse182falsefalsefalse00falsefalsefalsetruefalse183falsefalsefalse00falsefalsefalsetruefalse184falsefalsefalse00falsefalsefalsetruefalse185falsefalsefalse00falsefalsefalsetruefalse186falsefalsefalse00falsefalsefalsetruefalse187falsefalsefalse00falsefalsefalsetruefalse188falsefalsefalse00falsefalsefalsetruefalse189falsefalsefalse00falsefalsefalsetruefalse190falsefalsefalse00falsefalsefalsetruefalse191falsefalsefalse00falsefalsefalsetruefalse192falsefalsefalse00falsefalsefalsetruefalse193falsefalsefalse00falsefalsefalsetruefalse194falsefalsefalse00falsefalsefalsetruefalse195falsefalsefalse00falsefalsefalsetruefalse196falsefalsefalse00falsefalsefalsetruefalse197falsefalsefalse00falsefalsefalsetruefalse198falsefalsefalse00falsefalsefalsetruefalse199falsefalsefalse00falsefalsefalsetruefalse200falsefalsefalse00falsefalsefalsetruefalse201falsefalsefalse00falsefalsefalsetruefalse202falsefalsefalse00falsefalsefalsetruefalse203falsefalsefalse00falsefalsefalsetruefalse204falsefalsefalse00falsefalsefalsetruefalse205falsefalsefalse00falsefalsefalsetruefalse206falsefalsefalse00falsefalsefalsetruefalse207falsefalsefalse00falsefalsefalsetruefalse208falsefalsefalse00falsefalsefalsetruefalse209falsefalsefalse00falsefalsefalsetruefalse210falsefalsefalse00falsefalsefalsetruefalse211falsefalsefalse00falsefalsefalsetruefalse212falsefalsefalse00falsefalsefalsetruefalse213falsefalsefalse00falsefalsefalsetruefalse214falsefalsefalse00falsefalsefalsetruefalse215falsefalsefalse00falsefalsefalsetruefalse216falsefalsefalse00falsefalsefalsetruefalse217falsefalsefalse00falsefalsefalsetruefalse218falsefalsefalse00falsefalsefalsetruefalse219falsefalsefalse00falsefalsefalsetruefalse220falsefalsefalse00falsefalsefalsetruefalse221falsefalsefalse00falsefalsefalsetruefalse222falsefalsefalse00falsefalsefalsetruefalse223falsefalsefalse00falsefalsefalsetruefalse224falsefalsefalse00falsefalsefalsetruefalse225falsefalsefalse00falsefalsefalsetruefalse226falsefalsefalse00falsefalsefalsetruefalse227falsefalsefalse00falsefalsefalsetruefalse228falsefalsefalse00falsefalsefalsetruefalse229falsefalsefalse00falsefalsefalsetruefalse230falsefalsefalse00falsefalsefalsetruefalse231falsefalsefalse00falsefalsefalsetruefalse232falsefalsefalse00falsefalsefalsetruefalse233falsefalsefalse00falsefalsefalsetruefalse234falsefalsefalse00falsefalsefalsetruefalse235falsefalsefalse00falsefalsefalsetruefalse236falsefalsefalse00falsefalsefalsetruefalse237falsefalsefalse00falsefalsefalsetruefalse238falsefalsefalse00falsefalsefalsetruefalse239falsefalsefalse00falsefalsefalsetruefalse240falsefalsefalse00falsefalsefalsetruefalse241falsefalsefalse00falsefalsefalsetruefalse242falsefalsefalse00falsefalsefalsetruefalse243falsefalsefalse00falsefalsefalsetruefalse244falsefalsefalse00falsefalsefalsetruefalse245falsefalsefalse00falsefalsefalsetruefalse246falsefalsefalse00falsefalsefalsetruefalse247falsefalsefalse00falsefalsefalsetruefalse248falsefalsefalse00falsefalsefalsetruefalse249falsefalsefalse00falsefalsefalsetruefalse250falsefalsefalse00falsefalsefalsetruefalse251falsefalsefalse00falsefalsefalsetruefalse252falsefalsefalse00falsefalsefalsetruefalse253falsefalsefalse00falsefalsefalsetruefalse254falsefalsefalse00falsefalsefalsetruefalse255falsefalsefalse00falsefalsefalsetruefalse256falsefalsefalse00falsefalsefalsetruefalse257falsefalsefalse00falsefalsefalsetruefalse258falsefalsefalse00falsefalsefalsetruefalse259falsefalsefalse00falsefalsefalsetruefalse260falsefalsefalse00falsefalsefalsetruefalse261falsefalsefalse00falsefalsefalsetruefalse262falsefalsefalse00falsefalsefalsetruefalse263falsefalsefalse00falsefalsefalsetruefalse264falsefalsefalse00falsefalsefalsetruefalse265falsefalsefalse00falsefalsefalsetruefalse266falsefalsefalse00falsefalsefalsetruefalse267falsefalsefalse00falsefalsefalsetruefalse268falsefalsefalse00falsefalsefalsetruefalse269falsefalsefalse00falsefalsefalsetruefalse270falsefalsefalse00falsefalsefalsetruefalse271falsefalsefalse00falsefalsefalsetruefalse272falsefalsefalse00falsefalsefalsetruefalse273falsefalsefalse00falsefalsefalsetruefalse274falsefalsefalse00falsefalsefalsetruefalse275falsefalsefalse00falsefalsefalsetruefalse276falsefalsefalse00falsefalsefalsetruefalse277falsefalsefalse00falsefalsefalsetruefalse278falsefalsefalse00falsefalsefalsetruefalse279falsefalsefalse00falsefalsefalsetruefalse280falsefalsefalse00falsefalsefalsetruefalse281falsefalsefalse00falsefalsefalsetruefalse282falsefalsefalse00falsefalsefalsetruefalse283falsefalsefalse00falsefalsefalsetruefalse284falsefalsefalse00falsefalsefalsetruefalse285falsefalsefalse00falsefalsefalsetruefalse286falsefalsefalse00falsefalsefalsetruefalse287falsefalsefalse00falsefalsefalsetruefalse288falsefalsefalse00falsefalsefalsetruefalse289falsefalsefalse00falsefalsefalsetruefalse290falsefalsefalse00falsefalsefalsetruefalse291falsefalsefalse00falsefalsefalsetruefalse292falsefalsefalse00falsefalsefalsetruefalse293falsefalsefalse00falsefalsefalsetruefalse294falsefalsefalse00falsefalsefalsetruefalse295falsefalsefalse00falsefalsefalsetruefalse296falsefalsefalse00falsefalsefalsetruefalse297falsefalsefalse00falsefalsefalsetruefalse298falsefalsefalse00falsefalsefalsetruefalse299falsefalsefalse00falsefalsefalsetruefalse300falsefalsefalse00falsefalsefalsetruefalse301falsefalsefalse00falsefalsefalsetruefalse302falsefalsefalse00falsefalsefalsetruefalse303falsefalsefalse00falsefalsefalsetruefalse304falsefalsefalse00falsefalsefalsetruefalse305falsefalsefalse00falsefalsefalsetruefalse306falsefalsefalse00falsefalsefalsetruefalse307falsefalsefalse00falsefalsefalsetruefalse308falsefalsefalse00falsefalsefalsetruefalse309falsefalsefalse00falsefalsefalsetruefalse310falsefalsefalse00falsefalsefalsetruefalse311falsefalsefalse00falsefalsefalsetruefalse312falsefalsefalse00falsefalsefalsetruefalse313falsefalsefalse00falsefalsefalsetruefalse314falsefalsefalse00falsefalsefalsetruefalse315falsefalsefalse00falsefalsefalsetruefalse316falsefalsefalse00falsefalsefalsetruefalse317falsefalsefalse00falsefalsefalsetruefalse318falsefalsefalse00falsefalsefalsetruefalse319falsefalsefalse00falsefalsefalsetruefalse320falsefalsefalse00falsefalsefalsetruefalse321falsefalsefalse00falsefalsefalsetruefalse322falsefalsefalse00falsefalsefalsetruefalse323falsefalsefalse00falsefalsefalsetruefalse324falsefalsefalse00falsefalsefalsetruefalse325falsefalsefalse00falsefalsefalsetruefalse326falsefalsefalse00falsefalsefalsetruefalse327falsefalsefalse00falsefalsefalsetruefalse328falsefalsefalse00falsefalsefalsetruefalse329falsefalsefalse00falsefalsefalsetruefalse330falsefalsefalse00falsefalsefalsetruefalse331falsefalsefalse00falsefalsefalsetruefalse332falsefalsefalse00falsefalsefalsetruefalse333falsefalsefalse00falsefalsefalsetruefalse334falsefalsefalse00falsefalsefalsetruefalse335falsefalsefalse00falsefalsefalsetruefalse336falsefalsefalse00falsefalsefalsetruefalse337falsefalsefalse00falsefalsefalsetruefalse338falsefalsefalse00falsefalsefalsetruefalse339falsefalsefalse00falsefalsefalsetruefalse340falsefalsefalse00falsefalsefalsetruefalse341falsefalsefalse00falsefalsefalsetruefalse342falsefalsefalse00falsefalsefalsetruefalse343falsefalsefalse00falsefalsefalsetruefalse344falsefalsefalse00falsefalsefalsetruefalse345falsefalsefalse00falsefalsefalsetruefalse346falsefalsefalse00falsefalsefalsetruefalse347falsefalsefalse00falsefalsefalsetruefalse348falsefalsefalse00falsefalsefalsetruefalse349falsefalsefalse00falsefalsefalsetruefalse350falsefalsefalse00falsefalsefalsetruefalse351falsefalsefalse00falsefalsefalsetruefalse352falsefalsefalse00falsefalsefalsetruefalse353falsefalsefalse00falsefalsefalsetruefalse354falsefalsefalse00falsefalsefalsetruefalse355falsefalsefalse00falsefalsefalsetruefalse356falsefalsefalse00falsefalsefalsetruefalse357falsefalsefalse00falsefalsefalsetruefalse358falsefalsefalse00falsefalsefalsetruefalse359falsefalsefalse00falsefalsefalsetruefalse360falsefalsefalse00falsefalsefalsetruefalse361falsefalsefalse00falsefalsefalsetruefalse362falsefalsefalse00falsefalsefalsetruefalse363falsefalsefalse00falsefalsefalsetruefalse364falsefalsefalse00falsefalsefalsetruefalse365falsefalsefalse00falsefalsefalsetruefalse366falsefalsefalse00falsefalsefalsetruefalse367falsefalsefalse00falsefalsefalsetruefalse368falsefalsefalse00falsefalsefalsetruefalse369falsefalsefalse00falsefalsefalsetruefalse370falsefalsefalse00falsefalsefalsetruefalse371falsefalsefalse00falsefalsefalsetruefalse372falsefalsefalse00falsefalsefalsetruefalse373falsefalsefalse00falsefalsefalsetruefalse374falsefalsefalse00falsefalsefalsetruefalse375falsefalsefalse00falsefalsefalsetruefalse376falsefalsefalse00falsefalsefalsetruefalse377falsefalsefalse00falsefalsefalsetruefalse378falsefalsefalse00falsefalsefalsetruefalse379falsefalsefalse00falsefalsefalsetruefalse380falsefalsefalse00falsefalsefalsetruefalse381falsefalsefalse00falsefalsefalsetruefalse382falsefalsefalse00falsefalsefalsetruefalse383falsefalsefalse00falsefalsefalsetruefalse384falsefalsefalse00falsefalsefalsetruefalse385falsefalsefalse00falsefalsefalsetruefalse386falsefalsefalse00falsefalsefalsetruefalse387falsefalsefalse00falsefalsefalsetruefalse388falsefalsefalse00falsefalsefalsetruefalse389falsefalsefalse00falsefalsefalsetruefalse390falsefalsefalse00falsefalsefalsetruefalse391falsefalsefalse00falsefalsefalsetruefalse392falsefalsefalse00falsefalsefalsetruefalse393falsefalsefalse00falsefalsefalsetruefalse394falsefalsefalse00falsefalsefalsetruefalse395falsefalsefalse00falsefalsefalsetruefalse396falsefalsefalse00falsefalsefalsetruefalse397falsefalsefalse00falsefalsefalsetruefalse398falsefalsefalse00falsefalsefalsetruefalse399falsefalsefalse00falsefalsefalsetruefalse400falsefalsefalse00falsefalsefalsetruefalse401falsefalsefalse00falsefalsefalsetruefalse402falsefalsefalse00falsefalsefalsetruefalse403falsefalsefalse00falsefalsefalsetruefalse404falsefalsefalse00falsefalsefalsetruefalse405falsefalsefalse00falsefalsefalsetruefalse406falsefalsefalse00falsefalsefalsetruefalse407falsefalsefalse00falsefalsefalsetruefalse408falsefalsefalse00falsefalsefalsetruefalse409falsefalsefalse00falsefalsefalsetruefalse410falsefalsefalse00falsefalsefalsetruefalse411falsefalsefalse00falsefalsefalsetruefalse412falsefalsefalse00falsefalsefalsetruefalse413falsefalsefalse00falsefalsefalsetruefalse414falsefalsefalse00falsefalsefalsetruefalse415falsefalsefalse00falsefalsefalsetruefalse416falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringFair value liabilities measured on recurring basis.falsefalseLiabilities5false0fe_FairValueLiabilitiesMeasuredOnRecurringBasisfefalsecreditinstantFair Value Liabilities Measured On Recurring Basis.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse-1078000000-1078falsefalsefalsefalsefalse2truefalsefalse-814000000-814falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6truefalsefalse00falsefalsefalsetruefalse7truefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14truefalsefalse00falsefalsefalsetruefalse15truefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40truefalsefalse00falsefalsefalsetruefalse41truefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalse43falsefalsefalse00falsefalsefalsetruefalse44falsefalsefalse00falsefalsefalsetruefalse45falsefalsefalse00falsefalsefalsetruefalse46falsefalsefalse00falsefalsefalsetruefalse47falsefalsefalse00falsefalsefalsetruefalse48falsefalsefalse00falsefalsefalsetruefalse49truefalsefalse00falsefalsefalsetruefalse50truefalsefalse00falsefalsefalsetruefalse51falsefalsefalse00falsefalsefalsetruefalse52falsefalsefalse00falsefalsefalsetruefalse53falsefalsefalse00falsefalsefalsetruefalse54falsefalsefalse00falsefalsefalsetruefalse55falsefalsefalse00falsefalsefalsetruefalse56falsefalsefalse00falsefalsefalsetruefalse57truefalsefalse00falsefalsefalsetruefalse58truefalsefalse00falsefalsefalsetruefalse59falsefalsefalse00falsefalsefalsetruefalse60falsefalsefalse00falsefalsefalsetruefalse61falsefalsefalse00falsefalsefalsetruefalse62falsefalsefalse00falsefalsefalsetruefalse63falsefalsefalse00falsefalsefalsetruefalse64falsefalsefalse00falsefalsefalsetruefalse65falsefalsefalse00falsefalsefalsetruefalse66falsefalsefalse00falsefalsefalsetruefalse67truefalsefalse00falsefalsefalsetruefalse68truefalsefalse00falsefalsefalsetruefalse69falsefalsefalse00falsefalsefalsetruefalse70falsefalsefalse00falsefalsefalsetruefalse71falsefalsefalse00falsefalsefalsetruefalse72falsefalsefalse00falsefalsefalsetruefalse73falsefalsefalse00falsefalsefalsetruefalse74falsefalsefalse00falsefalsefalsetruefalse75falsefalsefalse00falsefalsefalsetruefalse76falsefalsefalse00falsefalsefalsetruefalse77falsefalsefalse00falsefalsefalsetruefalse78falsefalsefalse00falsefalsefalsetruefalse79truefalsefalse00falsefalsefalsetruefalse80truefalsefalse00falsefalsefalsetruefalse81truefalsefalse00falsefalsefalsetruefalse82truefalsefalse00falsefalsefalsetruefalse83falsefalsefalse00falsefalsefalsetruefalse84falsefalsefalse00falsefalsefalsetruefalse85falsefalsefalse00falsefalsefalsetruefalse86falsefalsefalse00falsefalsefalsetruefalse87falsefalsefalse00falsefalsefalsetruefalse88falsefalsefalse00falsefalsefalsetruefalse89truefalsefalse00falsefalsefalsetruefalse90truefalsefalse00falsefalsefalsetruefalse91falsefalsefalse00falsefalsefalsetruefalse92falsefalsefalse00falsefalsefalsetruefalse93falsefalsefalse00falsefalsefalsetruefalse94falsefalsefalse00falsefalsefalsetruefalse95falsefalsefalse00falsefalsefalsetruefalse96falsefalsefalse00falsefalsefalsetruefalse97falsefalsefalse00falsefalsefalsetruefalse98falsefalsefalse00falsefalsefalsetruefalse99truefalsefalse00falsefalsefalsetruefalse100truefalsefalse00falsefalsefalsetruefalse101truefalsefalse00falsefalsefalsetruefalse102truefalsefalse00falsefalsefalsetruefalse103falsefalsefalse00falsefalsefalsetruefalse104falsefalsefalse00falsefalsefalsetruefalse105truefalsefalse00falsefalsefalsetruefalse106truefalsefalse00falsefalsefalsetruefalse107falsefalsefalse00falsefalsefalsetruefalse108falsefalsefalse00falsefalsefalsetruefalse109falsefalsefalse00falsefalsefalsetruefalse110truefalsefalse-549000000-549falsefalsefalsetruefalse111truefalsefalse-348000000-348falsefalsefalsetruefalse112falsefalsefalse00falsefalsefalsetruefalse113falsefalsefalse00falsefalsefalsetruefalse114falsefalsefalse00falsefalsefalsetruefalse115falsefalsefalse00falsefalsefalsetruefalse116falsefalsefalse00falsefalsefalsetruefalse117falsefalsefalse00falsefalsefalsetruefalse118truefalsefalse-549000000-549falsefalsefalsetruefalse119truefalsefalse-348000000-348falsefalsefalsetruefalse120falsefalsefalse00falsefalsefalsetruefalse121falsefalsefalse00falsefalsefalsetruefalse122falsefalsefalse00falsefalsefalsetruefalse123falsefalsefalse00falsefalsefalsetruefalse124falsefalsefalse00falsefalsefalsetruefalse125falsefalsefalse00falsefalsefalsetruefalse126falsefalsefalse00falsefalsefalsetruefalse127falsefalsefalse00falsefalsefalsetruefalse128falsefalsefalse00falsefalsefalsetruefalse129falsefalsefalse00falsefalsefalsetruefalse130falsefalsefalse00falsefalsefalsetruefalse131falsefalsefalse00falsefalsefalsetruefalse132falsefalsefalse00falsefalsefalsetruefalse133falsefalsefalse00falsefalsefalsetruefalse134falsefalsefalse00falsefalsefalsetruefalse135falsefalsefalse00falsefalsefalsetruefalse136falsefalsefalse00falsefalsefalsetruefalse137falsefalsefalse00falsefalsefalsetruefalse138falsefalsefalse00falsefalsefalsetruefalse139falsefalsefalse00falsefalsefalsetruefalse140falsefalsefalse00falsefalsefalsetruefalse141falsefalsefalse00falsefalsefalsetruefalse142falsefalsefalse00falsefalsefalsetruefalse143falsefalsefalse00falsefalsefalsetruefalse144truefalsefalse00falsefalsefalsetruefalse145truefalsefalse00falsefalsefalsetruefalse146falsefalsefalse00falsefalsefalsetruefalse147falsefalsefalse00falsefalsefalsetruefalse148falsefalsefalse00falsefalsefalsetruefalse149falsefalsefalse00falsefalsefalsetruefalse150falsefalsefalse00falsefalsefalsetruefalse151falsefalsefalse00falsefalsefalsetruefalse152falsefalsefalse00falsefalsefalsetruefalse153truefalsefalse00falsefalsefalsetruefalse154truefalsefalse00falsefalsefalsetruefalse155falsefalsefalse00falsefalsefalsetruefalse156falsefalsefalse00falsefalsefalsetruefalse157falsefalsefalse00falsefalsefalsetruefalse158falsefalsefalse00falsefalsefalsetruefalse159falsefalsefalse00falsefalsefalsetruefalse160falsefalsefalse00falsefalsefalsetruefalse161truefalsefalse00falsefalsefalsetruefalse162truefalsefalse00falsefalsefalsetruefalse163falsefalsefalse00falsefalsefalsetruefalse164falsefalsefalse00falsefalsefalsetruefalse165falsefalsefalse00falsefalsefalsetruefalse166falsefalsefalse00falsefalsefalsetruefalse167falsefalsefalse00falsefalsefalsetruefalse168falsefalsefalse00falsefalsefalsetruefalse169falsefalsefalse00falsefalsefalsetruefalse170falsefalsefalse00falsefalsefalsetruefalse171truefalsefalse00falsefalsefalsetruefalse172truefalsefalse00falsefalsefalsetruefalse173falsefalsefalse00falsefalsefalsetruefalse174falsefalsefalse00falsefalsefalsetruefalse175falsefalsefalse00falsefalsefalsetruefalse176falsefalsefalse00falsefalsefalsetruefalse177falsefalsefalse00falsefalsefalsetruefalse178falsefalsefalse00falsefalsefalsetruefalse179falsefalsefalse00falsefalsefalsetruefalse180falsefalsefalse00falsefalsefalsetruefalse181falsefalsefalse00falsefalsefalsetruefalse182falsefalsefalse00falsefalsefalsetruefalse183truefalsefalse-588000000-588falsefalsefalsetruefalse184truefalsefalse-348000000-348falsefalsefalsetruefalse185truefalsefalse00falsefalsefalsetruefalse186truefalsefalse00falsefalsefalsetruefalse187falsefalsefalse00falsefalsefalsetruefalse188falsefalsefalse00falsefalsefalsetruefalse189falsefalsefalse00falsefalsefalsetruefalse190falsefalsefalse00falsefalsefalsetruefalse191falsefalsefalse00falsefalsefalsetruefalse192falsefalsefalse00falsefalsefalsetruefalse193truefalsefalse00falsefalsefalsetruefalse194truefalsefalse00falsefalsefalsetruefalse195falsefalsefalse00falsefalsefalsetruefalse196falsefalsefalse00falsefalsefalsetruefalse197falsefalsefalse00falsefalsefalsetruefalse198falsefalsefalse00falsefalsefalsetruefalse199falsefalsefalse00falsefalsefalsetruefalse200falsefalsefalse00falsefalsefalsetruefalse201falsefalsefalse00falsefalsefalsetruefalse202falsefalsefalse00falsefalsefalsetruefalse203truefalsefalse-583000000-583falsefalsefalsetruefalse204truefalsefalse-348000000-348falsefalsefalsetruefalse205truefalsefalse00falsefalsefalsetruefalse206truefalsefalse00falsefalsefalsetruefalse207falsefalsefalse00falsefalsefalsetruefalse208falsefalsefalse00falsefalsefalsetruefalse209truefalsefalse-5000000-5falsefalsefalsetruefalse210truefalsefalse00falsefalsefalsetruefalse211falsefalsefalse00falsefalsefalsetruefalse212falsefalsefalse00falsefalsefalsetruefalse213falsefalsefalse00falsefalsefalsetruefalse214truefalsefalse00falsefalsefalsetruefalse215truefalsefalse00falsefalsefalsetruefalse216falsefalsefalse00falsefalsefalsetruefalse217falsefalsefalse00falsefalsefalsetruefalse218falsefalsefalse00falsefalsefalsetruefalse219falsefalsefalse00falsefalsefalsetruefalse220falsefalsefalse00falsefalsefalsetruefalse221falsefalsefalse00falsefalsefalsetruefalse222truefalsefalse00falsefalsefalsetruefalse223truefalsefalse00falsefalsefalsetruefalse224falsefalsefalse00falsefalsefalsetruefalse225falsefalsefalse00falsefalsefalsetruefalse226falsefalsefalse00falsefalsefalsetruefalse227falsefalsefalse00falsefalsefalsetruefalse228falsefalsefalse00falsefalsefalsetruefalse229falsefalsefalse00falsefalsefalsetruefalse230falsefalsefalse00falsefalsefalsetruefalse231falsefalsefalse00falsefalsefalsetruefalse232falsefalsefalse00falsefalsefalsetruefalse233falsefalsefalse00falsefalsefalsetruefalse234falsefalsefalse00falsefalsefalsetruefalse235falsefalsefalse00falsefalsefalsetruefalse236falsefalsefalse00falsefalsefalsetruefalse237falsefalsefalse00falsefalsefalsetruefalse238falsefalsefalse00falsefalsefalsetruefalse239falsefalsefalse00falsefalsefalsetruefalse240falsefalsefalse00falsefalsefalsetruefalse241falsefalsefalse00falsefalsefalsetruefalse242falsefalsefalse00falsefalsefalsetruefalse243falsefalsefalse00falsefalsefalsetruefalse244falsefalsefalse00falsefalsefalsetruefalse245falsefalsefalse00falsefalsefalsetruefalse246falsefalsefalse00falsefalsefalsetruefalse247falsefalsefalse00falsefalsefalsetruefalse248truefalsefalse-239000000-239falsefalsefalsetruefalse249truefalsefalse-233000000-233falsefalsefalsetruefalse250falsefalsefalse00falsefalsefalsetruefalse251falsefalsefalse00falsefalsefalsetruefalse252falsefalsefalse00falsefalsefalsetruefalse253falsefalsefalse00falsefalsefalsetruefalse254falsefalsefalse00falsefalsefalsetruefalse255falsefalsefalse00falsefalsefalsetruefalse256falsefalsefalse00falsefalsefalsetruefalse257truefalsefalse-239000000-239falsefalsefalsetruefalse258truefalsefalse-233000000-233falsefalsefalsetruefalse259falsefalsefalse00falsefalsefalsetruefalse260falsefalsefalse00falsefalsefalsetruefalse261falsefalsefalse00falsefalsefalsetruefalse262falsefalsefalse00falsefalsefalsetruefalse263falsefalsefalse00falsefalsefalsetruefalse264falsefalsefalse00falsefalsefalsetruefalse265truefalsefalse-118000000-118falsefalsefalsetruefalse266truefalsefalse-116000000-116falsefalsefalsetruefalse267falsefalsefalse00falsefalsefalsetruefalse268falsefalsefalse00falsefalsefalsetruefalse269falsefalsefalse00falsefalsefalsetruefalse270falsefalsefalse00falsefalsefalsetruefalse271falsefalsefalse00falsefalsefalsetruefalse272falsefalsefalse00falsefalsefalsetruefalse273falsefalsefalse00falsefalsefalsetruefalse274falsefalsefalse00falsefalsefalsetruefalse275truefalsefalse-118000000-118falsefalsefalsetruefalse276truefalsefalse-116000000-116falsefalsefalsetruefalse277falsefalsefalse00falsefalsefalsetruefalse278falsefalsefalse00falsefalsefalsetruefalse279falsefalsefalse00falsefalsefalsetruefalse280falsefalsefalse00falsefalsefalsetruefalse281falsefalsefalse00falsefalsefalsetruefalse282falsefalsefalse00falsefalsefalsetruefalse283falsefalsefalse00falsefalsefalsetruefalse284falsefalsefalse00falsefalsefalsetruefalse285falsefalsefalse00falsefalsefalsetruefalse286falsefalsefalse00falsefalsefalsetruefalse287truefalsefalse-490000000-490falsefalsefalsetruefalse288truefalsefalse-466000000-466falsefalsefalsetruefalse289truefalsefalse-122000000-122falsefalsefalsetruefalse290truefalsefalse-117000000-117falsefalsefalsetruefalse291falsefalsefalse00falsefalsefalsetruefalse292falsefalsefalse00falsefalsefalsetruefalse293falsefalsefalse00falsefalsefalsetruefalse294falsefalsefalse00falsefalsefalsetruefalse295falsefalsefalse00falsefalsefalsetruefalse296falsefalsefalse00falsefalsefalsetruefalse297truefalsefalse-122000000-122falsefalsefalsetruefalse298truefalsefalse-117000000-117falsefalsefalsetruefalse299falsefalsefalse00falsefalsefalsetruefalse300falsefalsefalse00falsefalsefalsetruefalse301falsefalsefalse00falsefalsefalsetruefalse302falsefalsefalse00falsefalsefalsetruefalse303falsefalsefalse00falsefalsefalsetruefalse304falsefalsefalse00falsefalsefalsetruefalse305falsefalsefalse00falsefalsefalsetruefalse306falsefalsefalse00falsefalsefalsetruefalse307truefalsefalse00falsefalsefalsetruefalse308truefalsefalse00falsefalsefalsetruefalse309truefalsefalse-478000000-478falsefalsefalsetruefalse310truefalsefalse-466000000-466falsefalsefalsetruefalse311falsefalsefalse00falsefalsefalsetruefalse312falsefalsefalse00falsefalsefalsetruefalse313truefalsefalse00falsefalsefalsetruefalse314truefalsefalse-12000000-12falsefalsefalsetruefalse315truefalsefalse-549000000-549falsefalsefalsetruefalse316truefalsefalse-348000000-348falsefalsefalsetruefalse317falsefalsefalse00falsefalsefalsetruefalse318falsefalsefalse00falsefalsefalsetruefalse319falsefalsefalse00falsefalsefalsetruefalse320falsefalsefalse00falsefalsefalsetruefalse321falsefalsefalse00falsefalsefalsetruefalse322falsefalsefalse00falsefalsefalsetruefalse323falsefalsefalse00falsefalsefalsetruefalse324falsefalsefalse00falsefalsefalsetruefalse325falsefalsefalse00falsefalsefalsetruefalse326truefalsefalse-549000000-549falsefalsefalsetruefalse327truefalsefalse-348000000-348falsefalsefalsetruefalse328falsefalsefalse00falsefalsefalsetruefalse329falsefalsefalse00falsefalsefalsetruefalse330falsefalsefalse00falsefalsefalsetruefalse331falsefalsefalse00falsefalsefalsetruefalse332falsefalsefalse00falsefalsefalsetruefalse333falsefalsefalse00falsefalsefalsetruefalse334falsefalsefalse00falsefalsefalsetruefalse335falsefalsefalse00falsefalsefalsetruefalse336falsefalsefalse00falsefalsefalsetruefalse337falsefalsefalse00falsefalsefalsetruefalse338falsefalsefalse00falsefalsefalsetruefalse339falsefalsefalse00falsefalsefalsetruefalse340falsefalsefalse00falsefalsefalsetruefalse341falsefalsefalse00falsefalsefalsetruefalse342truefalsefalse-239000000-239falsefalsefalsetruefalse343truefalsefalse-233000000-233falsefalsefalsetruefalse344falsefalsefalse00falsefalsefalsetruefalse345falsefalsefalse00falsefalsefalsetruefalse346falsefalsefalse00falsefalsefalsetruefalse347falsefalsefalse00falsefalsefalsetruefalse348falsefalsefalse00falsefalsefalsetruefalse349falsefalsefalse00falsefalsefalsetruefalse350falsefalsefalse00falsefalsefalsetruefalse351falsefalsefalse00falsefalsefalsetruefalse352falsefalsefalse00falsefalsefalsetruefalse353falsefalsefalse00falsefalsefalsetruefalse354falsefalsefalse00falsefalsefalsetruefalse355truefalsefalse-239000000-239falsefalsefalsetruefalse356truefalsefalse-233000000-233falsefalsefalsetruefalse357falsefalsefalse00falsefalsefalsetruefalse358falsefalsefalse00falsefalsefalsetruefalse359falsefalsefalse00falsefalsefalsetruefalse360falsefalsefalse00falsefalsefalsetruefalse361falsefalsefalse00falsefalsefalsetruefalse362falsefalsefalse00falsefalsefalsetruefalse363falsefalsefalse00falsefalsefalsetruefalse364falsefalsefalse00falsefalsefalsetruefalse365truefalsefalse-118000000-118falsefalsefalsetruefalse366truefalsefalse-116000000-116falsefalsefalsetruefalse367falsefalsefalse00falsefalsefalsetruefalse368falsefalsefalse00falsefalsefalsetruefalse369falsefalsefalse00falsefalsefalsetruefalse370falsefalsefalse00falsefalsefalsetruefalse371falsefalsefalse00falsefalsefalsetruefalse372falsefalsefalse00falsefalsefalsetruefalse373falsefalsefalse00falsefalsefalsetruefalse374falsefalsefalse00falsefalsefalsetruefalse375falsefalsefalse00falsefalsefalsetruefalse376falsefalsefalse00falsefalsefalsetruefalse377falsefalsefalse00falsefalsefalsetruefalse378falsefalsefalse00falsefalsefalsetruefalse379truefalsefalse-118000000-118falsefalsefalsetruefalse380truefalsefalse-116000000-116falsefalsefalsetruefalse381falsefalsefalse00falsefalsefalsetruefalse382falsefalsefalse00falsefalsefalsetruefalse383falsefalsefalse00falsefalsefalsetruefalse384falsefalsefalse00falsefalsefalsetruefalse385falsefalsefalse00falsefalsefalsetruefalse386falsefalsefalse00falsefalsefalsetruefalse387truefalsefalse-122000000-122falsefalsefalsetruefalse388truefalsefalse-117000000-117falsefalsefalsetruefalse389falsefalsefalse00falsefalsefalsetruefalse390falsefalsefalse00falsefalsefalsetruefalse391falsefalsefalse00falsefalsefalsetruefalse392falsefalsefalse00falsefalsefalsetruefalse393falsefalsefalse00falsefalsefalsetruefalse394falsefalsefalse00falsefalsefalsetruefalse395truefalsefalse-122000000-122falsefalsefalsetruefalse396truefalsefalse-117000000-117falsefalsefalsetruefalse397falsefalsefalse00falsefalsefalsetruefalse398falsefalsefalse00falsefalsefalsetruefalse399falsefalsefalse00falsefalsefalsetruefalse400falsefalsefalse00falsefalsefalsetruefalse401falsefalsefalse00falsefalsefalsetruefalse402falsefalsefalse00falsefalsefalsetruefalse403falsefalsefalse00falsefalsefalsetruefalse404falsefalsefalse00falsefalsefalsetruefalse405falsefalsefalse00falsefalsefalsetruefalse406falsefalsefalse00falsefalsefalsetruefalse407falsefalsefalse00falsefalsefalsetruefalse408falsefalsefalse00falsefalsefalsetruefalse409truefalsefalse-583000000-583falsefalsefalsetruefalse410truefalsefalse-348000000-348falsefalsefalsetruefalse411truefalsefalse-478000000-478falsefalsefalsetruefalse412truefalsefalse-466000000-466falsefalsefalsetruefalse413falsefalsefalse00falsefalsefalsetruefalse414falsefalsefalse00falsefalsefalsetruefalse415truefalsefalse-5000000-5falsefalsefalsetruefalse416truefalsefalse-12000000-12falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryFair Value Liabilities Measured On Recurring Basis.No authoritative reference available.falsefalseTotal6false0fe_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisfefalsedebitinstantFair value net assets liabilities measured on recurring basis.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse19150000001915falsetruefalsefalsefalse2truefalsefalse18350000001835falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6truefalsefalse-93000000-93falsetruefalsetruefalse7truefalsefalse00falsetruefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40truefalsefalse2100000021falsetruefalsetruefalse41truefalsefalse9600000096falsetruefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalse43falsefalsefalse00falsefalsefalsetruefalse44falsefalsefalse00falsefalsefalsetruefalse45falsefalsefalse00falsefalsefalsetruefalse46falsefalsefalse00falsefalsefalsetruefalse47falsefalsefalse00falsefalsefalsetruefalse48falsefalsefalse00falsefalsefalsetruefalse49falsefalsefalse00falsefalsefalsetruefalse50falsefalsefalse00falsefalsefalsetruefalse51falsefalsefalse00falsefalsefalsetruefalse52falsefalsefalse00falsefalsefalsetruefalse53falsefalsefalse00falsefalsefalsetruefalse54falsefalsefalse00falsefalsefalsetruefalse55falsefalsefalse00falsefalsefalsetruefalse56falsefalsefalse00falsefalsefalsetruefalse57truefalsefalse3400000034falsetruefalsetruefalse58truefalsefalse160000000160falsetruefalsetruefalse59falsefalsefalse00falsefalsefalsetruefalse60falsefalsefalse00falsefalsefalsetruefalse61falsefalsefalse00falsefalsefalsetruefalse62falsefalsefalse00falsefalsefalsetruefalse63falsefalsefalse00falsefalsefalsetruefalse64falsefalsefalse00falsefalsefalsetruefalse65falsefalsefalse00falsefalsefalsetruefalse66falsefalsefalse00falsefalsefalsetruefalse67falsefalsefalse00falsefalsefalsetruefalse68falsefalsefalse00falsefalsefalsetruefalse69falsefalsefalse00falsefalsefalsetruefalse70falsefalsefalse00falsefalsefalsetruefalse71falsefalsefalse00falsefalsefalsetruefalse72falsefalsefalse00falsefalsefalsetruefalse73falsefalsefalse00falsefalsefalsetruefalse74falsefalsefalse00falsefalsefalsetruefalse75falsefalsefalse00falsefalsefalsetruefalse76falsefalsefalse00falsefalsefalsetruefalse77falsefalsefalse00falsefalsefalsetruefalse78falsefalsefalse00falsefalsefalsetruefalse79truefalsefalse194000000194falsetruefalsetruefalse80truefalsefalse338000000338falsetruefalsetruefalse81truefalsefalse2000000020falsetruefalsetruefalse82truefalsefalse8100000081falsetruefalsetruefalse83falsefalsefalse00falsefalsefalsetruefalse84falsefalsefalse00falsefalsefalsetruefalse85falsefalsefalse00falsefalsefalsetruefalse86falsefalsefalse00falsefalsefalsetruefalse87falsefalsefalse00falsefalsefalsetruefalse88falsefalsefalse00falsefalsefalsetruefalse89falsefalsefalse00falsefalsefalsetruefalse90falsefalsefalse00falsefalsefalsetruefalse91falsefalsefalse00falsefalsefalsetruefalse92falsefalsefalse00falsefalsefalsetruefalse93falsefalsefalse00falsefalsefalsetruefalse94falsefalsefalse00falsefalsefalsetruefalse95falsefalsefalse00falsefalsefalsetruefalse96falsefalsefalse00falsefalsefalsetruefalse97falsefalsefalse00falsefalsefalsetruefalse98falsefalsefalse00falsefalsefalsetruefalse99falsefalsefalse00falsefalsefalsetruefalse100falsefalsefalse00falsefalsefalsetruefalse101falsefalsefalse00falsefalsefalsetruefalse102falsefalsefalse00falsefalsefalsetruefalse103falsefalsefalse00falsefalsefalsetruefalse104falsefalsefalse00falsefalsefalsetruefalse105falsefalsefalse00falsefalsefalsetruefalse106falsefalsefalse00falsefalsefalsetruefalse107falsefalsefalse00falsefalsefalsetruefalse108falsefalsefalse00falsefalsefalsetruefalse109falsefalsefalse00falsefalsefalsetruefalse110truefalsefalse997000000997falsetruefalsetruefalse111truefalsefalse10300000001030falsetruefalsetruefalse112falsefalsefalse00falsefalsefalsetruefalse113falsefalsefalse00falsefalsefalsetruefalse114falsefalsefalse00falsefalsefalsetruefalse115falsefalsefalse00falsefalsefalsetruefalse116falsefalsefalse00falsefalsefalsetruefalse117falsefalsefalse00falsefalsefalsetruefalse118falsefalsefalse00falsefalsefalsetruefalse119falsefalsefalse00falsefalsefalsetruefalse120falsefalsefalse00falsefalsefalsetruefalse121falsefalsefalse00falsefalsefalsetruefalse122falsefalsefalse00falsefalsefalsetruefalse123falsefalsefalse00falsefalsefalsetruefalse124falsefalsefalse00falsefalsefalsetruefalse125falsefalsefalse00falsefalsefalsetruefalse126falsefalsefalse00falsefalsefalsetruefalse127falsefalsefalse00falsefalsefalsetruefalse128falsefalsefalse00falsefalsefalsetruefalse129falsefalsefalse00falsefalsefalsetruefalse130falsefalsefalse00falsefalsefalsetruefalse131falsefalsefalse00falsefalsefalsetruefalse132falsefalsefalse00falsefalsefalsetruefalse133falsefalsefalse00falsefalsefalsetruefalse134falsefalsefalse00falsefalsefalsetruefalse135falsefalsefalse00falsefalsefalsetruefalse136falsefalsefalse00falsefalsefalsetruefalse137falsefalsefalse00falsefalsefalsetruefalse138falsefalsefalse00falsefalsefalsetruefalse139falsefalsefalse00falsefalsefalsetruefalse140falsefalsefalse00falsefalsefalsetruefalse141falsefalsefalse00falsefalsefalsetruefalse142falsefalsefalse00falsefalsefalsetruefalse143falsefalsefalse00falsefalsefalsetruefalse144truefalsefalse383000000383falsetruefalsetruefalse145truefalsefalse298000000298falsetruefalsetruefalse146falsefalsefalse00falsefalsefalsetruefalse147falsefalsefalse00falsefalsefalsetruefalse148falsefalsefalse00falsefalsefalsetruefalse149falsefalsefalse00falsefalsefalsetruefalse150falsefalsefalse00falsefalsefalsetruefalse151falsefalsefalse00falsefalsefalsetruefalse152falsefalsefalse00falsefalsefalsetruefalse153falsefalsefalse00falsefalsefalsetruefalse154falsefalsefalse00falsefalsefalsetruefalse155falsefalsefalse00falsefalsefalsetruefalse156falsefalsefalse00falsefalsefalsetruefalse157falsefalsefalse00falsefalsefalsetruefalse158falsefalsefalse00falsefalsefalsetruefalse159falsefalsefalse00falsefalsefalsetruefalse160falsefalsefalse00falsefalsefalsetruefalse161truefalsefalse272000000272falsetruefalsetruefalse162truefalsefalse142000000142falsetruefalsetruefalse163falsefalsefalse00falsefalsefalsetruefalse164falsefalsefalse00falsefalsefalsetruefalse165falsefalsefalse00falsefalsefalsetruefalse166falsefalsefalse00falsefalsefalsetruefalse167falsefalsefalse00falsefalsefalsetruefalse168falsefalsefalse00falsefalsefalsetruefalse169falsefalsefalse00falsefalsefalsetruefalse170falsefalsefalse00falsefalsefalsetruefalse171falsefalsefalse00falsefalsefalsetruefalse172falsefalsefalse00falsefalsefalsetruefalse173falsefalsefalse00falsefalsefalsetruefalse174falsefalsefalse00falsefalsefalsetruefalse175falsefalsefalse00falsefalsefalsetruefalse176falsefalsefalse00falsefalsefalsetruefalse177falsefalsefalse00falsefalsefalsetruefalse178falsefalsefalse00falsefalsefalsetruefalse179falsefalsefalse00falsefalsefalsetruefalse180falsefalsefalse00falsefalsefalsetruefalse181falsefalsefalse00falsefalsefalsetruefalse182falsefalsefalse00falsefalsefalsetruefalse183truefalsefalse20930000002093falsetruefalsetruefalse184truefalsefalse18410000001841falsetruefalsetruefalse185truefalsefalse234000000234falsetruefalsetruefalse186truefalsefalse157000000157falsetruefalsetruefalse187falsefalsefalse00falsefalsefalsetruefalse188falsefalsefalse00falsefalsefalsetruefalse189falsefalsefalse00falsefalsefalsetruefalse190falsefalsefalse00falsefalsefalsetruefalse191falsefalsefalse00falsefalsefalsetruefalse192falsefalsefalse00falsefalsefalsetruefalse193falsefalsefalse00falsefalsefalsetruefalse194falsefalsefalse00falsefalsefalsetruefalse195falsefalsefalse00falsefalsefalsetruefalse196falsefalsefalse00falsefalsefalsetruefalse197falsefalsefalse00falsefalsefalsetruefalse198falsefalsefalse00falsefalsefalsetruefalse199falsefalsefalse00falsefalsefalsetruefalse200falsefalsefalse00falsefalsefalsetruefalse201falsefalsefalse00falsefalsefalsetruefalse202falsefalsefalse00falsefalsefalsetruefalse203falsefalsefalse00falsefalsefalsetruefalse204falsefalsefalse00falsefalsefalsetruefalse205falsefalsefalse00falsefalsefalsetruefalse206falsefalsefalse00falsefalsefalsetruefalse207falsefalsefalse00falsefalsefalsetruefalse208falsefalsefalse00falsefalsefalsetruefalse209falsefalsefalse00falsefalsefalsetruefalse210falsefalsefalse00falsefalsefalsetruefalse211falsefalsefalse00falsefalsefalsetruefalse212falsefalsefalse00falsefalsefalsetruefalse213falsefalsefalse00falsefalsefalsetruefalse214truefalsefalse10000001falsetruefalsetruefalse215truefalsefalse00falsetruefalsetruefalse216falsefalsefalse00falsefalsefalsetruefalse217falsefalsefalse00falsefalsefalsetruefalse218falsefalsefalse00falsefalsefalsetruefalse219falsefalsefalse00falsefalsefalsetruefalse220falsefalsefalse00falsefalsefalsetruefalse221falsefalsefalse00falsefalsefalsetruefalse222falsefalsefalse00falsefalsefalsetruefalse223falsefalsefalse00falsefalsefalsetruefalse224falsefalsefalse00falsefalsefalsetruefalse225falsefalsefalse00falsefalsefalsetruefalse226falsefalsefalse00falsefalsefalsetruefalse227falsefalsefalse00falsefalsefalsetruefalse228falsefalsefalse00falsefalsefalsetruefalse229falsefalsefalse00falsefalsefalsetruefalse230falsefalsefalse00falsefalsefalsetruefalse231falsefalsefalse00falsefalsefalsetruefalse232falsefalsefalse00falsefalsefalsetruefalse233falsefalsefalse00falsefalsefalsetruefalse234falsefalsefalse00falsefalsefalsetruefalse235falsefalsefalse00falsefalsefalsetruefalse236falsefalsefalse00falsefalsefalsetruefalse237falsefalsefalse00falsefalsefalsetruefalse238falsefalsefalse00falsefalsefalsetruefalse239falsefalsefalse00falsefalsefalsetruefalse240falsefalsefalse00falsefalsefalsetruefalse241falsefalsefalse00falsefalsefalsetruefalse242falsefalsefalse00falsefalsefalsetruefalse243falsefalsefalse00falsefalsefalsetruefalse244falsefalsefalse00falsefalsefalsetruefalse245falsefalsefalse00falsefalsefalsetruefalse246falsefalsefalse00falsefalsefalsetruefalse247falsefalsefalse00falsefalsefalsetruefalse248truefalsefalse-233000000-233falsetruefalsetruefalse249truefalsefalse-227000000-227falsetruefalsetruefalse250falsefalsefalse00falsefalsefalsetruefalse251falsefalsefalse00falsefalsefalsetruefalse252falsefalsefalse00falsefalsefalsetruefalse253falsefalsefalse00falsefalsefalsetruefalse254falsefalsefalse00falsefalsefalsetruefalse255falsefalsefalse00falsefalsefalsetruefalse256falsefalsefalse00falsefalsefalsetruefalse257falsefalsefalse00falsefalsefalsetruefalse258falsefalsefalse00falsefalsefalsetruefalse259falsefalsefalse00falsefalsefalsetruefalse260falsefalsefalse00falsefalsefalsetruefalse261falsefalsefalse00falsefalsefalsetruefalse262falsefalsefalse00falsefalsefalsetruefalse263falsefalsefalse00falsefalsefalsetruefalse264falsefalsefalse00falsefalsefalsetruefalse265truefalsefalse-11000000-11falsetruefalsetruefalse266truefalsefalse-4000000-4falsetruefalsetruefalse267falsefalsefalse00falsefalsefalsetruefalse268falsefalsefalse00falsefalsefalsetruefalse269falsefalsefalse00falsefalsefalsetruefalse270falsefalsefalse00falsefalsefalsetruefalse271falsefalsefalse00falsefalsefalsetruefalse272falsefalsefalse00falsefalsefalsetruefalse273falsefalsefalse00falsefalsefalsetruefalse274falsefalsefalse00falsefalsefalsetruefalse275falsefalsefalse00falsefalsefalsetruefalse276falsefalsefalse00falsefalsefalsetruefalse277falsefalsefalse00falsefalsefalsetruefalse278falsefalsefalse00falsefalsefalsetruefalse279falsefalsefalse00falsefalsefalsetruefalse280falsefalsefalse00falsefalsefalsetruefalse281falsefalsefalse00falsefalsefalsetruefalse282falsefalsefalse00falsefalsefalsetruefalse283falsefalsefalse00falsefalsefalsetruefalse284falsefalsefalse00falsefalsefalsetruefalse285falsefalsefalse00falsefalsefalsetruefalse286falsefalsefalse00falsefalsefalsetruefalse287truefalsefalse-372000000-372falsetruefalsetruefalse288truefalsefalse-344000000-344falsetruefalsetruefalse289truefalsefalse-118000000-118falsetruefalsetruefalse290truefalsefalse-113000000-113falsetruefalsetruefalse291falsefalsefalse00falsefalsefalsetruefalse292falsefalsefalse00falsefalsefalsetruefalse293falsefalsefalse00falsefalsefalsetruefalse294falsefalsefalse00falsefalsefalsetruefalse295falsefalsefalse00falsefalsefalsetruefalse296falsefalsefalse00falsefalsefalsetruefalse297falsefalsefalse00falsefalsefalsetruefalse298falsefalsefalse00falsefalsefalsetruefalse299falsefalsefalse00falsefalsefalsetruefalse300falsefalsefalse00falsefalsefalsetruefalse301falsefalsefalse00falsefalsefalsetruefalse302falsefalsefalse00falsefalsefalsetruefalse303falsefalsefalse00falsefalsefalsetruefalse304falsefalsefalse00falsefalsefalsetruefalse305falsefalsefalse00falsefalsefalsetruefalse306falsefalsefalse00falsefalsefalsetruefalse307falsefalsefalse00falsefalsefalsetruefalse308falsefalsefalse00falsefalsefalsetruefalse309falsefalsefalse00falsefalsefalsetruefalse310falsefalsefalse00falsefalsefalsetruefalse311falsefalsefalse00falsefalsefalsetruefalse312falsefalsefalse00falsefalsefalsetruefalse313falsefalsefalse00falsefalsefalsetruefalse314falsefalsefalse00falsefalsefalsetruefalse315truefalsefalse10910000001091falsetruefalsetruefalse316truefalsefalse10300000001030falsetruefalsetruefalse317falsefalsefalse00falsefalsefalsetruefalse318falsefalsefalse00falsefalsefalsetruefalse319falsefalsefalse00falsefalsefalsetruefalse320falsefalsefalse00falsefalsefalsetruefalse321falsefalsefalse00falsefalsefalsetruefalse322falsefalsefalse00falsefalsefalsetruefalse323falsefalsefalse00falsefalsefalsetruefalse324falsefalsefalse00falsefalsefalsetruefalse325falsefalsefalse00falsefalsefalsetruefalse326falsefalsefalse00falsefalsefalsetruefalse327falsefalsefalse00falsefalsefalsetruefalse328falsefalsefalse00falsefalsefalsetruefalse329falsefalsefalse00falsefalsefalsetruefalse330falsefalsefalse00falsefalsefalsetruefalse331falsefalsefalse00falsefalsefalsetruefalse332falsefalsefalse00falsefalsefalsetruefalse333falsefalsefalse00falsefalsefalsetruefalse334falsefalsefalse00falsefalsefalsetruefalse335falsefalsefalse00falsefalsefalsetruefalse336falsefalsefalse00falsefalsefalsetruefalse337falsefalsefalse00falsefalsefalsetruefalse338falsefalsefalse00falsefalsefalsetruefalse339falsefalsefalse00falsefalsefalsetruefalse340falsefalsefalse00falsefalsefalsetruefalse341falsefalsefalse00falsefalsefalsetruefalse342truefalsefalse171000000171falsetruefalsetruefalse343truefalsefalse167000000167falsetruefalsetruefalse344falsefalsefalse00falsefalsefalsetruefalse345falsefalsefalse00falsefalsefalsetruefalse346falsefalsefalse00falsefalsefalsetruefalse347falsefalsefalse00falsefalsefalsetruefalse348falsefalsefalse00falsefalsefalsetruefalse349falsefalsefalse00falsefalsefalsetruefalse350falsefalsefalse00falsefalsefalsetruefalse351falsefalsefalse00falsefalsefalsetruefalse352falsefalsefalse00falsefalsefalsetruefalse353falsefalsefalse00falsefalsefalsetruefalse354falsefalsefalse00falsefalsefalsetruefalse355falsefalsefalse00falsefalsefalsetruefalse356falsefalsefalse00falsefalsefalsetruefalse357falsefalsefalse00falsefalsefalsetruefalse358falsefalsefalse00falsefalsefalsetruefalse359falsefalsefalse00falsefalsefalsetruefalse360falsefalsefalse00falsefalsefalsetruefalse361falsefalsefalse00falsefalsefalsetruefalse362falsefalsefalse00falsefalsefalsetruefalse363falsefalsefalse00falsefalsefalsetruefalse364falsefalsefalse00falsefalsefalsetruefalse365truefalsefalse295000000295falsetruefalsetruefalse366truefalsefalse298000000298falsetruefalsetruefalse367falsefalsefalse00falsefalsefalsetruefalse368falsefalsefalse00falsefalsefalsetruefalse369falsefalsefalse00falsefalsefalsetruefalse370falsefalsefalse00falsefalsefalsetruefalse371falsefalsefalse00falsefalsefalsetruefalse372falsefalsefalse00falsefalsefalsetruefalse373falsefalsefalse00falsefalsefalsetruefalse374falsefalsefalse00falsefalsefalsetruefalse375falsefalsefalse00falsefalsefalsetruefalse376falsefalsefalse00falsefalsefalsetruefalse377falsefalsefalse00falsefalsefalsetruefalse378falsefalsefalse00falsefalsefalsetruefalse379falsefalsefalse00falsefalsefalsetruefalse380falsefalsefalse00falsefalsefalsetruefalse381falsefalsefalse00falsefalsefalsetruefalse382falsefalsefalse00falsefalsefalsetruefalse383falsefalsefalse00falsefalsefalsetruefalse384falsefalsefalse00falsefalsefalsetruefalse385falsefalsefalse00falsefalsefalsetruefalse386falsefalsefalse00falsefalsefalsetruefalse387truefalsefalse136000000136falsetruefalsetruefalse388truefalsefalse125000000125falsetruefalsetruefalse389falsefalsefalse00falsefalsefalsetruefalse390falsefalsefalse00falsefalsefalsetruefalse391falsefalsefalse00falsefalsefalsetruefalse392falsefalsefalse00falsefalsefalsetruefalse393falsefalsefalse00falsefalsefalsetruefalse394falsefalsefalse00falsefalsefalsetruefalse395falsefalsefalse00falsefalsefalsetruefalse396falsefalsefalse00falsefalsefalsetruefalse397falsefalsefalse00falsefalsefalsetruefalse398falsefalsefalse00falsefalsefalsetruefalse399falsefalsefalse00falsefalsefalsetruefalse400falsefalsefalse00falsefalsefalsetruefalse401falsefalsefalse00falsefalsefalsetruefalse402falsefalsefalse00falsefalsefalsetruefalse403falsefalsefalse00falsefalsefalsetruefalse404falsefalsefalse00falsefalsefalsetruefalse405falsefalsefalse00falsefalsefalsetruefalse406falsefalsefalse00falsefalsefalsetruefalse407falsefalsefalse00falsefalsefalsetruefalse408falsefalsefalse00falsefalsefalsetruefalse409falsefalsefalse00falsefalsefalsetruefalse410falsefalsefalse00falsefalsefalsetruefalse411falsefalsefalse00falsefalsefalsetruefalse412falsefalsefalse00falsefalsefalsetruefalse413falsefalsefalse00falsefalsefalsetruefalse414falsefalsefalse00falsefalsefalsetruefalse415falsefalsefalse00falsefalsefalsetruefalse416falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryFair value net assets liabilities measured on recurring basis.No authoritative reference available.falsefalseNet assets (liabilities)4165Fair Value of Financial Instruments (Details 5) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue