1.0.0.3 false CONSOLIDATED BALANCE SHEETS (USD $) In Millions false 1 $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u002 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u002 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 6 CURRENT ASSETS: 4 us-gaap_AssetsCurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 7 Cash and cash equivalents 5 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 true true 838000000 838 false false 2 true true 545000000 545 false false No definition available. No authoritative reference available. false 8 Receivables- 5 us-gaap_ReceivablesNetCurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 9 Customers 6 us-gaap_AccountsReceivableNetCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 1260000000 1260 false false 2 false true 1304000000 1304 false false No definition available. No authoritative reference available. false 10 Other 6 us-gaap_OtherReceivables us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 132000000 132 false false 2 false true 167000000 167 false false No definition available. No authoritative reference available. false 11 Materials and supplies, at average cost 5 us-gaap_InventoryNet us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 621000000 621 false false 2 false true 605000000 605 false false No definition available. No authoritative reference available. false 12 Prepaid taxes 5 us-gaap_PrepaidTaxes us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 585000000 585 false false 2 false true 283000000 283 false false No definition available. No authoritative reference available. false 13 Other 5 us-gaap_OtherAssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 334000000 334 false false 2 false true 149000000 149 false false No definition available. No authoritative reference available. false 14 Total current assets 5 us-gaap_AssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 3770000000 3770 false false 2 false true 3053000000 3053 false false No definition available. No authoritative reference available. true 15 PROPERTY, PLANT AND EQUIPMENT: 4 us-gaap_PropertyPlantAndEquipmentNetAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 16 In service 5 us-gaap_PropertyPlantAndEquipmentGross us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 27526000000 27526 false false 2 false true 26482000000 26482 false false No definition available. No authoritative reference available. false 17 Less - Accumulated provision for depreciation 5 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 11267000000 11267 false false 2 false true 10821000000 10821 false false No definition available. No authoritative reference available. false 18 Total in service, net of accumulated depreciation 5 fe_NetPlantExcludingConstructionWorkInProgress fe false debit instant monetary Period end amount of total net PPE false false false false false false false false false 1 false true 16259000000 16259 false false 2 false true 15661000000 15661 false false Period end amount of total net PPE No authoritative reference available. true 19 Construction work in progress 5 us-gaap_ConstructionInProgressGross us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 2490000000 2490 false false 2 false true 2062000000 2062 false false No definition available. No authoritative reference available. false 20 Total property, plant and equipment 5 us-gaap_PropertyPlantAndEquipmentNet us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 18749000000 18749 false false 2 false true 17723000000 17723 false false No definition available. No authoritative reference available. true 21 INVESTMENTS: 4 us-gaap_InvestmentsAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 22 Nuclear plant decommissioning trusts 5 us-gaap_DecommissioningFundInvestments us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 1856000000 1856 false false 2 false true 1708000000 1708 false false No definition available. No authoritative reference available. false 23 Investments in lease obligation bonds 5 us-gaap_HeldToMaturitySecuritiesNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 553000000 553 false false 2 false true 598000000 598 false false No definition available. No authoritative reference available. false 24 Other 5 us-gaap_OtherLongTermInvestments us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 698000000 698 false false 2 false true 711000000 711 false false No definition available. No authoritative reference available. false 25 Total investments 5 us-gaap_LongTermInvestments us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 3107000000 3107 false false 2 false true 3017000000 3017 false false No definition available. No authoritative reference available. true 26 DEFERRED CHARGES AND OTHER ASSETS: 4 fe_DeferredChargesAndOtherAssetsAbstract fe false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 27 Goodwill 5 us-gaap_Goodwill us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 5575000000 5575 false false 2 false true 5575000000 5575 false false No definition available. No authoritative reference available. false 28 Regulatory assets 5 us-gaap_RegulatoryAssetsNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 2543000000 2543 false false 2 false true 3140000000 3140 false false No definition available. No authoritative reference available. false 29 Power purchase contract asset 5 us-gaap_CommodityContractAssetNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 220000000 220 false false 2 false true 434000000 434 false false No definition available. No authoritative reference available. false 30 Other 5 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 710000000 710 false false 2 false true 579000000 579 false false No definition available. No authoritative reference available. false 31 Total deferred charges and other assets 5 us-gaap_AssetsNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 9048000000 9048 false false 2 false true 9728000000 9728 false false No definition available. No authoritative reference available. true 32 Total assets 4 us-gaap_Assets us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 34674000000 34674 false false 2 false true 33521000000 33521 false false No definition available. No authoritative reference available. true 34 CURRENT LIABILITIES: 4 us-gaap_LiabilitiesCurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 35 Currently payable long-term debt 5 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 2020000000 2020 false false 2 false true 2476000000 2476 false false No definition available. No authoritative reference available. false 36 Short-term borrowings 5 us-gaap_ShortTermBorrowings us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1653000000 1653 false false 2 false true 2397000000 2397 false false No definition available. No authoritative reference available. false 37 Accounts payable 5 us-gaap_AccountsPayableCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 692000000 692 false false 2 false true 794000000 794 false false No definition available. No authoritative reference available. false 38 Accrued taxes 5 us-gaap_AccruedIncomeTaxesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 257000000 257 false false 2 false true 333000000 333 false false No definition available. No authoritative reference available. false 39 Other 5 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1114000000 1114 false false 2 false true 1098000000 1098 false false No definition available. No authoritative reference available. false 40 Total current liabilities 5 us-gaap_LiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 5736000000 5736 false false 2 false true 7098000000 7098 false false No definition available. No authoritative reference available. true 42 Common stockholders' equity- 5 us-gaap_StockholdersEquityAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 43 Common stock 6 us-gaap_CommonStockValue us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 31000000 31 false false 2 false true 31000000 31 false false No definition available. No authoritative reference available. false 44 Other paid-in capital 6 us-gaap_AdditionalPaidInCapital us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 5438000000 5438 false false 2 false true 5473000000 5473 false false No definition available. No authoritative reference available. false 45 Accumulated other comprehensive loss 6 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true -1401000000 -1401 false false 2 false true -1380000000 -1380 false false No definition available. No authoritative reference available. false 46 Retained earnings 6 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 4424000000 4424 false false 2 false true 4159000000 4159 false false No definition available. No authoritative reference available. false 47 Total common stockholders' equity 6 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 8492000000 8492 false false 2 false true 8283000000 8283 false false No definition available. No authoritative reference available. true 48 Noncontrolling interest 5 us-gaap_MinorityInterest us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1000000 1 false false 2 false true 32000000 32 false false No definition available. No authoritative reference available. false 49 Total equity 5 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 8493000000 8493 false false 2 false true 8315000000 8315 false false No definition available. No authoritative reference available. false 50 Long-term debt and other long-term obligations 5 us-gaap_LongTermDebtAndCapitalLeaseObligations us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 11647000000 11647 false false 2 false true 9100000000 9100 false false No definition available. No authoritative reference available. false 51 Total capitalization 5 fe_TotalCapitalization fe false credit instant monetary total stockholders' equity, term debt and other long-term obligations. false false false false false false false false false 1 false true 20140000000 20140 false false 2 false true 17415000000 17415 false false total stockholders' equity, term debt and other long-term obligations. No authoritative reference available. true 52 NONCURRENT LIABILITIES: 4 us-gaap_LiabilitiesNoncurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 53 Accumulated deferred income taxes 5 us-gaap_DeferredTaxLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 2562000000 2562 false false 2 false true 2163000000 2163 false false No definition available. No authoritative reference available. false 54 Asset retirement obligations 5 us-gaap_AssetRetirementObligationsNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1401000000 1401 false false 2 false true 1335000000 1335 false false No definition available. No authoritative reference available. false 55 Deferred gain on sale and leaseback transaction 5 us-gaap_SaleLeasebackTransactionDeferredGainNet us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1001000000 1001 false false 2 false true 1027000000 1027 false false No definition available. No authoritative reference available. false 56 Power purchase contract liability 5 fe_ContractLossLiabilities fe false na instant monetary Total obligations incurred as part of normal operations that is expected to be repaid beyond the following twelve months or... false false false false false false false false false 1 false true 685000000 685 false false 2 false true 766000000 766 false false Total obligations incurred as part of normal operations that is expected to be repaid beyond the following twelve months or one business cycle. No authoritative reference available. false 57 Retirement benefits 5 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1500000000 1500 false false 2 false true 1884000000 1884 false false No definition available. No authoritative reference available. false 58 Lease market valuation liability 5 us-gaap_OffMarketLeaseUnfavorable us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 274000000 274 false false 2 false true 308000000 308 false false No definition available. No authoritative reference available. false 59 Other 5 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1375000000 1375 false false 2 false true 1525000000 1525 false false No definition available. No authoritative reference available. false 60 Total noncurrent liabilities 5 us-gaap_LiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 8798000000 8798 false false 2 false true 9008000000 9008 false false No definition available. No authoritative reference available. true 61 Total liabilities and capitalization 4 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 true true 34674000000 34674 false false 2 true true 33521000000 33521 false false No definition available. No authoritative reference available. true false 2 54 false Millions UnKnown UnKnown false true