1.0.0.3 false CONSOLIDATED STATEMENTS OF CASH FLOWS (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 3 CASH FLOWS FROM OPERATING ACTIVITIES: 1 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract 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 4 NET INCOME 2 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 754000000 754 false false 2 true true 1011000000 1011 false false No definition available. No authoritative reference available. false 5 Adjustments to reconcile net income to net cash from operating activities- 2 us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract 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 6 Provision for depreciation 3 us-gaap_DepreciationNonproduction us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 550000000 550 false false 2 false true 500000000 500 false false No definition available. No authoritative reference available. false 7 Amortization of regulatory assets 3 us-gaap_AmortizationOfRegulatoryAsset us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 903000000 903 false false 2 false true 795000000 795 false false No definition available. No authoritative reference available. false 8 Deferral of regulatory assets 3 fe_DeferralOfRegulatoryAssets fe false credit duration monetary Current period electric expenses of a regulated entity which are reclassified as capitalized electric costs and are expected... false false false false false false false false false 1 false true 136000000 136 false false 2 false true 261000000 261 false false Current period electric expenses of a regulated entity which are reclassified as capitalized electric costs and are expected to be recoverable through rate adjustments. No authoritative reference available. false 9 Nuclear fuel and lease amortization 3 us-gaap_OtherAmortizationOfDeferredCharges us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 92000000 92 false false 2 false true 82000000 82 false false No definition available. No authoritative reference available. false 10 Deferred purchased power and other costs 3 us-gaap_DeferredPurchasedPowerCosts us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -235000000 -235 false false 2 false true -138000000 -138 false false No definition available. No authoritative reference available. false 11 Deferred income taxes and investment tax credits, net 3 us-gaap_DeferredIncomeTaxesAndTaxCredits us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 421000000 421 false false 2 false true 278000000 278 false false No definition available. No authoritative reference available. false 12 Investment impairment 3 us-gaap_ImpairmentOfInvestments us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 39000000 39 false false 2 false true 63000000 63 false false No definition available. No authoritative reference available. false 13 Deferred rents and lease market valuation liability 3 fe_DeferredRentsAndLeaseMarketValuationLiability fe false na duration monetary No definition available. false false false false false false false false false 1 false true -20000000 -20 false false 2 false true -62000000 -62 false false No definition available. No authoritative reference available. false 14 Accrued compensation and retirement benefits 3 us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 20000000 20 false false 2 false true -127000000 -127 false false No definition available. No authoritative reference available. false 15 Stock-based compensation 3 us-gaap_ShareBasedCompensation us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -1000000 -1 false false 2 false true -74000000 -74 false false No definition available. No authoritative reference available. false 16 Gain on asset sales 3 us-gaap_GainLossOnSaleOfOtherAssets us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -12000000 -12 false false 2 false true -43000000 -43 false false No definition available. No authoritative reference available. false 17 Electric service prepayment programs 3 us-gaap_IncreaseDecreaseInDeferredRevenue us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -10000000 -10 false false 2 false true -58000000 -58 false false No definition available. No authoritative reference available. false 18 Cash collateral, net 3 fe_CashCollateralNet fe false na duration monetary Cash received from or paid to suppliers based on deposits required for hedging activities. false false false false false false false false false 1 false true -85000000 -85 false false 2 false true 21000000 21 false false Cash received from or paid to suppliers based on deposits required for hedging activities. No authoritative reference available. false 19 Gain on investment securities held in trusts 3 us-gaap_GainLossOnSaleOfInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -172000000 -172 false false 2 false true -43000000 -43 false false No definition available. No authoritative reference available. false 20 Loss on debt redemption 3 us-gaap_GainsLossesOnExtinguishmentOfDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 142000000 142 false false 2 false false 0 0 false false No definition available. No authoritative reference available. false 21 Pension trust contribution 3 us-gaap_PensionContributions us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -500000000 -500 false false 2 false false 0 0 false false No definition available. No authoritative reference available. false 22 Decrease (increase) in operating assets- 2 us-gaap_IncreaseDecreaseInOperatingAssetsAbstract 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 23 Receivables 3 us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 78000000 78 false false 2 false true -117000000 -117 false false No definition available. No authoritative reference available. false 24 Materials and supplies 3 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 30000000 30 false false 2 false true -34000000 -34 false false No definition available. No authoritative reference available. false 25 Prepaid taxes 3 us-gaap_IncreaseDecreaseInPrepaidExpense us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -332000000 -332 false false 2 false true -259000000 -259 false false No definition available. No authoritative reference available. false 26 Increase (decrease) in operating liabilities- 2 us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract 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 27 Accounts payable 3 us-gaap_IncreaseDecreaseInAccountsPayableTrade us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -103000000 -103 false false 2 false true -34000000 -34 false false No definition available. No authoritative reference available. false 28 Accrued taxes 3 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -97000000 -97 false false 2 false true -166000000 -166 false false No definition available. No authoritative reference available. false 29 Accrued interest 3 us-gaap_IncreaseDecreaseInInterestPayableNet us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 121000000 121 false false 2 false true 107000000 107 false false No definition available. No authoritative reference available. false 30 Other 2 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 17000000 17 false false 2 false true -10000000 -10 false false No definition available. No authoritative reference available. false 31 Net cash provided from operating activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 1464000000 1464 false false 2 false true 1431000000 1431 false false No definition available. No authoritative reference available. true 33 New Financing- 2 fe_NewFinancingAbstract 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 34 Long-term debt 3 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 4151000000 4151 false false 2 false true 631000000 631 false false No definition available. No authoritative reference available. false 35 Short-term borrowings, net 3 us-gaap_ProceedsFromShortTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 false false 2 false true 1489000000 1489 false false No definition available. No authoritative reference available. false 36 Redemptions and Repayments- 2 fe_RedemptionsAndRepaymentsAbstract 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 37 Long-term debt 3 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -2213000000 -2213 false false 2 false true -733000000 -733 false false No definition available. No authoritative reference available. false 38 Short-term borrowings, net 3 us-gaap_RepaymentsOfShortTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -764000000 -764 false false 2 false false 0 0 false false No definition available. No authoritative reference available. false 39 Net controlled disbursement activity 2 us-gaap_ProceedsFromRepaymentsOfBankOverdrafts us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -15000000 -15 false false 2 false true 6000000 6 false false No definition available. No authoritative reference available. false 40 Common stock dividend payments 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -503000000 -503 false false 2 false true -503000000 -503 false false No definition available. No authoritative reference available. false 41 Other 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -39000000 -39 false false 2 false true 21000000 21 false false No definition available. No authoritative reference available. false 42 Net cash provided from financing activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 617000000 617 false false 2 false true 911000000 911 false false No definition available. No authoritative reference available. true 43 CASH FLOWS FROM INVESTING ACTIVITIES: 1 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract 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 44 Property additions 2 us-gaap_PaymentsToAcquireProductiveAssets us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -1575000000 -1575 false false 2 false true -2177000000 -2177 false false No definition available. No authoritative reference available. false 45 Proceeds from asset sales 2 us-gaap_ProceedsFromSaleOfOtherProductiveAssets us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 19000000 19 false false 2 false true 64000000 64 false false No definition available. No authoritative reference available. false 46 Sales of investment securities held in trusts 2 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 3039000000 3039 false false 2 false true 1144000000 1144 false false No definition available. No authoritative reference available. false 47 Purchases of investment securities held in trusts 2 us-gaap_PaymentsToAcquireAvailableForSaleSecurities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -3101000000 -3101 false false 2 false true -1215000000 -1215 false false No definition available. No authoritative reference available. false 48 Cash investments 2 us-gaap_PaymentsForProceedsFromInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -4000000 -4 false false 2 false true 72000000 72 false false No definition available. No authoritative reference available. false 49 Restricted funds for debt redemption 2 us-gaap_IncreaseDecreaseInRestrictedCash us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -150000000 -150 false false 2 false true -82000000 -82 false false No definition available. No authoritative reference available. false 50 Other 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -16000000 -16 false false 2 false true -96000000 -96 false false No definition available. No authoritative reference available. false 51 Net cash used for investing activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -1788000000 -1788 false false 2 false true -2290000000 -2290 false false No definition available. No authoritative reference available. true 52 Net change in cash and cash equivalents 1 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 293000000 293 false false 2 false true 52000000 52 false false No definition available. No authoritative reference available. true 53 Cash and cash equivalents at beginning of period 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 545000000 545 false false 2 false true 129000000 129 false false No definition available. No authoritative reference available. false 54 Cash and cash equivalents at end of period 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 true true 838000000 838 false false 2 true true 181000000 181 false false No definition available. No authoritative reference available. false false 2 51 false Millions UnKnown UnKnown false true