2.2.0.7 true Goodwill (Details) (Percent [Member]) 00603 - Disclosure - Goodwill (Details) true false false false 1 true false false false Energy Delivery Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentOneMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember false false Percent [Member] fe_GoodwillMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_PercentMember fe_GoodwillMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 1 Energy Delivery Services [Member] | Percent [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuregoodwilldetails false 1 false false false false 0 0 false false false false 1 true false false false Energy Delivery Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentOneMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember false false Percent [Member] fe_GoodwillMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_PercentMember fe_GoodwillMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 na No definition available. No authoritative reference available. false 2 Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test 2 fe_IncreaseDecreaseInFairValueUsedInAnnualGoodwillImpairmentTest fe false na instant Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. false false false false false false false false false false false false 1 false true false false 0.52 0.52 false false false us-types:percentItemType pure Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. No authoritative reference available. false 3 CEI [Member] | Percent [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuregoodwilldetails false 1 false false false false 0 0 false false false false 2 true false false false CEI [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiaryTwoMember dei_LegalEntityAxis explicitMember false false Percent [Member] fe_GoodwillMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_PercentMember fe_GoodwillMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 na No definition available. No authoritative reference available. false 4 Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test 2 fe_IncreaseDecreaseInFairValueUsedInAnnualGoodwillImpairmentTest fe false na instant Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. false false false false false false false false false false false false 1 false true false false 0.26 0.26 false false false us-types:percentItemType pure Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. No authoritative reference available. false 5 TE [Member] | Percent [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuregoodwilldetails false 1 false false false false 0 0 false false false false 3 true false false false TE [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiaryThreeMember dei_LegalEntityAxis explicitMember false false Percent [Member] fe_GoodwillMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_PercentMember fe_GoodwillMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 na No definition available. No authoritative reference available. false 6 Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test 2 fe_IncreaseDecreaseInFairValueUsedInAnnualGoodwillImpairmentTest fe false na instant Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. false false false false false false false false false false false false 1 false true false false 0.64 0.64 false false false us-types:percentItemType pure Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. No authoritative reference available. false 7 JCP&L [Member] | Percent [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuregoodwilldetails false 1 false false false false 0 0 false false false false 4 true false false false JCP&L [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiaryFourMember dei_LegalEntityAxis explicitMember false false Percent [Member] fe_GoodwillMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_PercentMember fe_GoodwillMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 na No definition available. No authoritative reference available. false 8 Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test 2 fe_IncreaseDecreaseInFairValueUsedInAnnualGoodwillImpairmentTest fe false na instant Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. false false false false false false false false false false false false 1 false true false false 0.38 0.38 false false false us-types:percentItemType pure Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. No authoritative reference available. false 9 Met-Ed [Member] | Percent [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuregoodwilldetails false 1 false false false false 0 0 false false false false 5 true false false false Met-Ed [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiaryFiveMember dei_LegalEntityAxis explicitMember false false Percent [Member] fe_GoodwillMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_PercentMember fe_GoodwillMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 na No definition available. No authoritative reference available. false 10 Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test 2 fe_IncreaseDecreaseInFairValueUsedInAnnualGoodwillImpairmentTest fe false na instant Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. false false false false false false false false false false false false 1 false true false false 0.56 0.56 false false false us-types:percentItemType pure Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. No authoritative reference available. false 11 Penelec [Member] | Percent [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuregoodwilldetails false 1 false false false false 0 0 false false false false 6 true false false false Penelec [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi fe_SubsidiarySixMember dei_LegalEntityAxis explicitMember false false Percent [Member] fe_GoodwillMeasurementUnitsAxis xbrldi http://xbrl.org/2006/xbrldi fe_PercentMember fe_GoodwillMeasurementUnitsAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 na No definition available. No authoritative reference available. false 12 Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test 2 fe_IncreaseDecreaseInFairValueUsedInAnnualGoodwillImpairmentTest fe false na instant Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. false false false false false false false false false false false false 1 false true false false 0.57 0.57 false false false us-types:percentItemType pure Increase Decrease In Fair Value Used In Annual Goodwill Impairment Test. No authoritative reference available. false 1 12 false UnKnown UnKnown UnKnown false true