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Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a false 4 Internal revenues 2 us-gaap_SegmentReportingInformationIntersegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false false false false 0 0   false false false 2 false false false false 0 0   false false false 3 false true false false 67000000 67000000 [1] false false false 4 false false false false 0 0   false false false xbrli:monetaryItemType monetary Amount of revenue from transactions with other operating segments of the same entity. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b true 5 Total revenues 2 us-gaap_SegmentReportingSegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3693000000 3693000000 false false false 2 false true false false 3408000000 3408000000 false false false 3 false true false false 10122000000 10122000000 false false false 4 false true false false 10013000000 10013000000 false false false xbrli:monetaryItemType monetary Total revenues for reportable segments. 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Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e false 7 Investment income 2 us-gaap_InvestmentIncomeInterestAndDividend us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 46000000 46000000 false false false 2 false true false false 191000000 191000000 false false false 3 false true false false 93000000 93000000 false false false 4 false true false false 207000000 207000000 false false false xbrli:monetaryItemType monetary Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. 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Reporting interest revenue net of interest expense is permitted only when a majority of the segment's revenues are from interest and the chief operating decision maker relies primarily on net interest revenue to assess the performance of the segment and make decisions about resources to be allocated to the segment. In all other segment disclosure situations, interest revenue must be reported separately from interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph end false 9 Income taxes 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 119000000 119000000 false false false 2 false true false false 128000000 128000000 false false false 3 false true false false 364000000 364000000 false false false 4 false true false false 430000000 430000000 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 10 Net income (loss) 2 us-gaap_SegmentReportingInformationProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 175000000 175000000 false false false 2 false true false false 230000000 230000000 false false false 3 false true false false 580000000 580000000 false false false 4 false true false false 754000000 754000000 false false false xbrli:monetaryItemType monetary Amount of profit or loss recognized by the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 11 Total assets 2 us-gaap_SegmentReportingInformationAssets us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 34707000000 34707000000 false false false 2 false true false false 34674000000 34674000000 false false false 3 false true false false 34707000000 34707000000 false false false 4 false true false false 34674000000 34674000000 false false false xbrli:monetaryItemType monetary Amount of total assets attributed to the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 12 Total goodwill 2 us-gaap_SegmentReportingInformationGoodwill us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 5575000000 5575000000 false false false 2 false true false false 5575000000 5575000000 false false false 3 false true false false 5575000000 5575000000 false false false 4 false true false false 5575000000 5575000000 false false false xbrli:monetaryItemType monetary Carrying amount attributed to the reportable segment of goodwill (adjusted for any amortization and impairment charges), which is the cumulative amount paid in excess of the fair value of net assets acquired in one or more business combination transactions. No authoritative reference available. false 13 Property additions 2 us-gaap_SegmentReportingInformationExpendituresForAdditionsToLongLivedAssets us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 470000000 470000000 false false false 2 false true false false 432000000 432000000 false false false 3 false true false false 1467000000 1467000000 false false false 4 false true false false 1575000000 1575000000 false false false xbrli:monetaryItemType monetary Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment. Must be disclosed if the amount (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b false 14 Segment Information (Textuals) 2 fe_SegmentInformationTextualsAbstract fe false na duration Segment Information. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Segment Information. false 15 Number of customers served by utility operating companies 2 fe_NumberOfCustomersServedByUtilityOperatingCompanies fe false na duration Number of customers served by utility operating companies. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 4500000 4500000 false false false 4 false false false false 0 0 false false false xbrli:integerItemType integer Number of customers served by utility operating companies. No authoritative reference available. false 16 Number of square miles in service territories in Ohio Pennsylvania and New Jersey 2 fe_NumberOfSquareMilesInServiceTerritoriesInOhioPennsylvaniaAndNewJersey fe false na instant Number of square miles in service territories in Ohio Pennsylvania and New Jersey. false false false false false false false false false false false false 1 false true false false 36100 36100 false false false 2 false false false false 0 0 false false false 3 false true false false 36100 36100 false false false 4 false false false false 0 0 false false false xbrli:integerItemType integer Number of square miles in service territories in Ohio Pennsylvania and New Jersey. No authoritative reference available. false 17 Megawatts of net demonstrated capacity of competitive segment 2 fe_MegawattsOfNetDemonstratedCapacityOfCompetitiveSegment fe false na instant Megawatts of net demonstrated capacity of competitive segment. false false false false false false false false false false false false 1 false true false false 14000000 14000000 false false false 2 false false false false 0 0 false false false 3 false true false false 14000000 14000000 false false false 4 false false false false 0 0 false false false xbrli:integerItemType integer Megawatts of net demonstrated capacity of competitive segment. No authoritative reference available. false 18 Energy Delivery Services [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuresegmentinformationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 5 USD true false false false Energy Delivery Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentOneMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false Energy Delivery Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentOneMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false Energy Delivery Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentOneMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false Energy Delivery Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentOneMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 19 Segment Financial Information 2 fe_SegmentFinancialInformationAbstract fe false na duration Segment Financial Information. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Segment Financial Information. false 20 External revenues 2 us-gaap_SegmentReportingInformationRevenueFromExternalCustomers us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2757000000 2757000000 false false false 2 false true false false 2942000000 2942000000 false false false 3 false true false false 7673000000 7673000000 false false false 4 false true false false 8755000000 8755000000 false false false xbrli:monetaryItemType monetary Amount of revenue from external customers for the reportable segment. Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a false 21 Internal revenues 2 us-gaap_SegmentReportingInformationIntersegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 60000000 60000000 false false false 2 false false false false 0 0   false false false 3 false true false false 79000000 79000000 [1] false false false 4 false false false false 0 0   false false false xbrli:monetaryItemType monetary Amount of revenue from transactions with other operating segments of the same entity. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b true 22 Total revenues 2 us-gaap_SegmentReportingSegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2817000000 2817000000 false false false 2 false true false false 2942000000 2942000000 false false false 3 false true false false 7752000000 7752000000 false false false 4 false true false false 8755000000 8755000000 false false false xbrli:monetaryItemType monetary Total revenues for reportable segments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 32 -Subparagraph a false 23 Depreciation and amortization 2 us-gaap_SegmentReportingInformationDepreciationDepletionAndAmortizationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 287000000 287000000 false false false 2 false true false false 373000000 373000000 false false false 3 false true false false 888000000 888000000 false false false 4 false true false false 1098000000 1098000000 false false false xbrli:monetaryItemType monetary Amount of depreciation, depletion, and amortization expense for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e false 24 Investment income 2 us-gaap_InvestmentIncomeInterestAndDividend us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 23000000 23000000 false false false 2 false true false false 46000000 46000000 false false false 3 false true false false 75000000 75000000 false false false 4 false true false false 111000000 111000000 false false false xbrli:monetaryItemType monetary Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 5 false 25 Net interest charges 2 us-gaap_SegmentReportingInformationInterestIncomeExpenseNet us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 123000000 123000000 false false false 2 false true false false 115000000 115000000 false false false 3 false true false false 369000000 369000000 false false false 4 false true false false 338000000 338000000 false false false xbrli:monetaryItemType monetary Amount of interest revenue net of interest expense for the reportable segment. Reporting interest revenue net of interest expense is permitted only when a majority of the segment's revenues are from interest and the chief operating decision maker relies primarily on net interest revenue to assess the performance of the segment and make decisions about resources to be allocated to the segment. In all other segment disclosure situations, interest revenue must be reported separately from interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph end false 26 Income taxes 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 137000000 137000000 false false false 2 false true false false 99000000 99000000 false false false 3 false true false false 295000000 295000000 false false false 4 false true false false 190000000 190000000 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 27 Net income (loss) 2 us-gaap_SegmentReportingInformationProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 224000000 224000000 false false false 2 false true false false 148000000 148000000 false false false 3 false true false false 481000000 481000000 false false false 4 false true false false 285000000 285000000 false false false xbrli:monetaryItemType monetary Amount of profit or loss recognized by the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 28 Total assets 2 us-gaap_SegmentReportingInformationAssets us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 22773000000 22773000000 false false false 2 false true false false 23023000000 23023000000 false false false 3 false true false false 22773000000 22773000000 false false false 4 false true false false 23023000000 23023000000 false false false xbrli:monetaryItemType monetary Amount of total assets attributed to the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 29 Total goodwill 2 us-gaap_SegmentReportingInformationGoodwill us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 5551000000 5551000000 false false false 2 false true false false 5551000000 5551000000 false false false 3 false true false false 5551000000 5551000000 false false false 4 false true false false 5551000000 5551000000 false false false xbrli:monetaryItemType monetary Carrying amount attributed to the reportable segment of goodwill (adjusted for any amortization and impairment charges), which is the cumulative amount paid in excess of the fair value of net assets acquired in one or more business combination transactions. No authoritative reference available. false 30 Property additions 2 us-gaap_SegmentReportingInformationExpendituresForAdditionsToLongLivedAssets us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 208000000 208000000 false false false 2 false true false false 182000000 182000000 false false false 3 false true false false 546000000 546000000 false false false 4 false true false false 524000000 524000000 false false false xbrli:monetaryItemType monetary Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment. Must be disclosed if the amount (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b false 35 Competitive Energy Services [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuresegmentinformationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 9 USD true false false false Competitive Energy Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentTwoMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 10 USD true false false false Competitive Energy Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentTwoMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false Competitive Energy Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentTwoMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 USD true false false false Competitive Energy Services [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_SegmentTwoMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 36 Segment Financial Information 2 fe_SegmentFinancialInformationAbstract fe false na duration Segment Financial Information. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Segment Financial Information. false 37 External revenues 2 us-gaap_SegmentReportingInformationRevenueFromExternalCustomers us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 957000000 957000000 false false false 2 false true false false 490000000 490000000 false false false 3 false true false false 2453000000 2453000000 false false false 4 false true false false 1329000000 1329000000 false false false xbrli:monetaryItemType monetary Amount of revenue from external customers for the reportable segment. Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a false 38 Internal revenues 2 us-gaap_SegmentReportingInformationIntersegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 599000000 599000000 false false false 2 false true false false 617000000 617000000 false false false 3 false true false false 1812000000 1812000000 [1] false false false 4 false true false false 2349000000 2349000000 false false false xbrli:monetaryItemType monetary Amount of revenue from transactions with other operating segments of the same entity. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b true 39 Total revenues 2 us-gaap_SegmentReportingSegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1556000000 1556000000 false false false 2 false true false false 1107000000 1107000000 false false false 3 false true false false 4265000000 4265000000 false false false 4 false true false false 3678000000 3678000000 false false false xbrli:monetaryItemType monetary Total revenues for reportable segments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 32 -Subparagraph a false 40 Depreciation and amortization 2 us-gaap_SegmentReportingInformationDepreciationDepletionAndAmortizationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 62000000 62000000 false false false 2 false true false false 69000000 69000000 false false false 3 false true false false 194000000 194000000 false false false 4 false true false false 201000000 201000000 false false false xbrli:monetaryItemType monetary Amount of depreciation, depletion, and amortization expense for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e false 41 Investment income 2 us-gaap_InvestmentIncomeInterestAndDividend us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 28000000 28000000 false false false 2 false true false false 159000000 159000000 false false false 3 false true false false 42000000 42000000 false false false 4 false true false false 136000000 136000000 false false false xbrli:monetaryItemType monetary Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 5 false 42 Net interest charges 2 us-gaap_SegmentReportingInformationInterestIncomeExpenseNet us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 30000000 30000000 false false false 2 false true false false 28000000 28000000 false false false 3 false true false false 94000000 94000000 false false false 4 false true false false 64000000 64000000 false false false xbrli:monetaryItemType monetary Amount of interest revenue net of interest expense for the reportable segment. Reporting interest revenue net of interest expense is permitted only when a majority of the segment's revenues are from interest and the chief operating decision maker relies primarily on net interest revenue to assess the performance of the segment and make decisions about resources to be allocated to the segment. In all other segment disclosure situations, interest revenue must be reported separately from interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph end false 43 Income taxes 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -17000000 -17000000 false false false 2 false true false false 121000000 121000000 false false false 3 false true false false 106000000 106000000 false false false 4 false true false false 409000000 409000000 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 44 Net income (loss) 2 us-gaap_SegmentReportingInformationProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -27000000 -27000000 false false false 2 false true false false 183000000 183000000 false false false 3 false true false false 174000000 174000000 false false false 4 false true false false 614000000 614000000 false false false xbrli:monetaryItemType monetary Amount of profit or loss recognized by the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 45 Total assets 2 us-gaap_SegmentReportingInformationAssets us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 11076000000 11076000000 false false false 2 false true false false 10691000000 10691000000 false false false 3 false true false false 11076000000 11076000000 false false false 4 false true false false 10691000000 10691000000 false false false xbrli:monetaryItemType monetary Amount of total assets attributed to the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 46 Total goodwill 2 us-gaap_SegmentReportingInformationGoodwill us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 24000000 24000000 false false false 2 false true false false 24000000 24000000 false false false 3 false true false false 24000000 24000000 false false false 4 false true false false 24000000 24000000 false false false xbrli:monetaryItemType monetary Carrying amount attributed to the reportable segment of goodwill (adjusted for any amortization and impairment charges), which is the cumulative amount paid in excess of the fair value of net assets acquired in one or more business combination transactions. No authoritative reference available. false 47 Property additions 2 us-gaap_SegmentReportingInformationExpendituresForAdditionsToLongLivedAssets us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 255000000 255000000 false false false 2 false true false false 224000000 224000000 false false false 3 false true false false 860000000 860000000 false false false 4 false true false false 893000000 893000000 false false false xbrli:monetaryItemType monetary Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment. Must be disclosed if the amount (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b false 52 Other Business Operations [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuresegmentinformationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 13 USD true false false false Other Business Operations [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_OtherBusinessOperationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 14 USD true false false false Other Business Operations [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_OtherBusinessOperationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 15 USD true false false false Other Business Operations [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_OtherBusinessOperationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 16 USD true false false false Other Business Operations [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_OtherBusinessOperationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 53 Segment Financial Information 2 fe_SegmentFinancialInformationAbstract fe false na duration Segment Financial Information. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Segment Financial Information. false 54 External revenues 2 us-gaap_SegmentReportingInformationRevenueFromExternalCustomers us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 11000000 11000000 false false false 2 false true false false 6000000 6000000 false false false 3 false true false false 21000000 21000000 false false false 4 false true false false 18000000 18000000 false false false xbrli:monetaryItemType monetary Amount of revenue from external customers for the reportable segment. Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a false 55 Internal revenues 2 us-gaap_SegmentReportingInformationIntersegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false false false false 0 0   false false false 2 false false false false 0 0   false false false 3 false false false false 0 0   [1] false false false 4 false false false false 0 0   false false false xbrli:monetaryItemType monetary Amount of revenue from transactions with other operating segments of the same entity. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b true 56 Total revenues 2 us-gaap_SegmentReportingSegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 11000000 11000000 false false false 2 false true false false 6000000 6000000 false false false 3 false true false false 21000000 21000000 false false false 4 false true false false 18000000 18000000 false false false xbrli:monetaryItemType monetary Total revenues for reportable segments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 32 -Subparagraph a false 57 Depreciation and amortization 2 us-gaap_SegmentReportingInformationDepreciationDepletionAndAmortizationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 6000000 6000000 false false false 2 false true false false 3000000 3000000 false false false 3 false true false false 25000000 25000000 false false false 4 false true false false 7000000 7000000 false false false xbrli:monetaryItemType monetary Amount of depreciation, depletion, and amortization expense for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e false 58 Investment income 2 us-gaap_InvestmentIncomeInterestAndDividend us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0   false false false 2 false false false false 0 0   false false false 3 false false false false 0 0   false false false 4 false false false false 0 0   false false false xbrli:monetaryItemType monetary Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 5 false 59 Net interest charges 2 us-gaap_SegmentReportingInformationInterestIncomeExpenseNet us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2000000 2000000 false false false 2 false true false false 2000000 2000000 false false false 3 false true false false 4000000 4000000 false false false 4 false true false false 5000000 5000000 false false false xbrli:monetaryItemType monetary Amount of interest revenue net of interest expense for the reportable segment. Reporting interest revenue net of interest expense is permitted only when a majority of the segment's revenues are from interest and the chief operating decision maker relies primarily on net interest revenue to assess the performance of the segment and make decisions about resources to be allocated to the segment. In all other segment disclosure situations, interest revenue must be reported separately from interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph end false 60 Income taxes 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 5000000 5000000 false false false 2 false true false false -19000000 -19000000 false false false 3 false true false false -14000000 -14000000 false false false 4 false true false false -56000000 -56000000 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 61 Net income (loss) 2 us-gaap_SegmentReportingInformationProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0   false false false 2 false true false false 17000000 17000000 false false false 3 false true false false -3000000 -3000000 false false false 4 false true false false 52000000 52000000 false false false xbrli:monetaryItemType monetary Amount of profit or loss recognized by the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 62 Total assets 2 us-gaap_SegmentReportingInformationAssets us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 604000000 604000000 false false false 2 false true false false 674000000 674000000 false false false 3 false true false false 604000000 604000000 false false false 4 false true false false 674000000 674000000 false false false xbrli:monetaryItemType monetary Amount of total assets attributed to the reportable segment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 false 63 Total goodwill 2 us-gaap_SegmentReportingInformationGoodwill us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0   false false false 2 false false false false 0 0   false false false 3 false false false false 0 0   false false false 4 false false false false 0 0   false false false xbrli:monetaryItemType monetary Carrying amount attributed to the reportable segment of goodwill (adjusted for any amortization and impairment charges), which is the cumulative amount paid in excess of the fair value of net assets acquired in one or more business combination transactions. No authoritative reference available. false 64 Property additions 2 us-gaap_SegmentReportingInformationExpendituresForAdditionsToLongLivedAssets us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 8000000 8000000 false false false 2 false true false false 14000000 14000000 false false false 3 false true false false 18000000 18000000 false false false 4 false true false false 133000000 133000000 false false false xbrli:monetaryItemType monetary Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment. Must be disclosed if the amount (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b false 69 Reconciling Adjustments [Member] 0 na true na na No definition available. false true false false false false false false false false false http://firstenergycorp.com/role/disclosuresegmentinformationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 17 USD true false false false Reconciling Adjustments [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_ReconcilingAdjustmentsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 18 USD true false false false Reconciling Adjustments [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_ReconcilingAdjustmentsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 19 USD true false false false Reconciling Adjustments [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_ReconcilingAdjustmentsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 20 USD true false false false Reconciling Adjustments [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fe_ReconcilingAdjustmentsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 70 Segment Financial Information 2 fe_SegmentFinancialInformationAbstract fe false na duration Segment Financial Information. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Segment Financial Information. false 71 External revenues 2 us-gaap_SegmentReportingInformationRevenueFromExternalCustomers us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -32000000 -32000000 false false false 2 false true false false -30000000 -30000000 false false false 3 false true false false -92000000 -92000000 false false false 4 false true false false -89000000 -89000000 false false false xbrli:monetaryItemType monetary Amount of revenue from external customers for the reportable segment. Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a false 72 Internal revenues 2 us-gaap_SegmentReportingInformationIntersegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -659000000 -659000000 false false false 2 false true false false -617000000 -617000000 false false false 3 false true false false -1824000000 -1824000000 [1] false false false 4 false true false false -2349000000 -2349000000 false false false xbrli:monetaryItemType monetary Amount of revenue from transactions with other operating segments of the same entity. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b true 73 Total revenues 2 us-gaap_SegmentReportingSegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -691000000 -691000000 false false false 2 false true false false -647000000 -647000000 false false false 3 false true false false -1916000000 -1916000000 false false false 4 false true false false -2438000000 -2438000000 false false false xbrli:monetaryItemType monetary Total revenues for reportable segments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 32 -Subparagraph a false 74 Depreciation and amortization 2 us-gaap_SegmentReportingInformationDepreciationDepletionAndAmortizationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3000000 3000000 false false false 2 false true false false 4000000 4000000 false false false 3 false true false false 7000000 7000000 false false false 4 false true false false 11000000 11000000 false false false xbrli:monetaryItemType monetary Amount of depreciation, depletion, and amortization expense for the reportable segment. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph e false 75 Investment income 2 us-gaap_InvestmentIncomeInterestAndDividend us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -5000000 -5000000 false false false 2 false true false false -14000000 -14000000 false false false 3 false true false false -24000000 -24000000 false false false 4 false true false false -40000000 -40000000 false false false xbrli:monetaryItemType monetary Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. 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Reporting interest revenue net of interest expense is permitted only when a majority of the segment's revenues are from interest and the chief operating decision maker relies primarily on net interest revenue to assess the performance of the segment and make decisions about resources to be allocated to the segment. In all other segment disclosure situations, interest revenue must be reported separately from interest expense. 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No authoritative reference available. false 81 Property additions 2 us-gaap_SegmentReportingInformationExpendituresForAdditionsToLongLivedAssets us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false -1000000 -1000000 false false false 2 true true false false 12000000 12000000 false false false 3 true true false false 43000000 43000000 false false false 4 true true false false 25000000 25000000 false false false xbrli:monetaryItemType monetary Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment. Must be disclosed if the amount (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b false 1 Under the accounting standard for the effeccts of certain types of regulation, internal revenues are not fully offset for sales of RECs by FES to the Ohio Companies that are retained in inventory. 4 68 false NoRounding UnKnown UnKnown false true