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 false 3 $ 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 3 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 990000000 990 false false 2 true true 1339000000 1339 false false 3 true true 1312000000 1312 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 3 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 736000000 736 false false 2 false true 677000000 677 false false 3 false true 638000000 638 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 1155000000 1155 false false 2 false true 1053000000 1053 false false 3 false true 1019000000 1019 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 -316000000 -316 false false 3 false true -524000000 -524 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 128000000 128 false false 2 false true 112000000 112 false false 3 false true 101000000 101 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 -338000000 -338 false false 2 false true -226000000 -226 false false 3 false true -350000000 -350 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 384000000 384 false false 2 false true 366000000 366 false false 3 false true -9000000 -9 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 62000000 62 false false 2 false true 123000000 123 false false 3 false true 26000000 26 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 -52000000 -52 false false 2 false true -95000000 -95 false false 3 false true -99000000 -99 false false No definition available. No authoritative reference available. false 14 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 20000000 20 false false 2 false true -64000000 -64 false false 3 false true -39000000 -39 false false No definition available. No authoritative reference available. false 15 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 22000000 22 false false 2 false true -140000000 -140 false false 3 false true -37000000 -37 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 -27000000 -27 false false 2 false true -72000000 -72 false false 3 false true -30000000 -30 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 -77000000 -77 false false 3 false true -75000000 -75 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 30000000 30 false false 2 false true -31000000 -31 false false 3 false true -68000000 -68 false false Cash received from or paid to suppliers based on deposits required for hedging activities. No authoritative reference available. false 19 Gain on sales of 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 -176000000 -176 false false 2 false true -63000000 -63 false false 3 false true -10000000 -10 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 146000000 146 false false 2 false true 0 0 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 21 Commodity derivative transactions, net (Note 6) 3 fe_GainLossOnDerivatives fe false na duration monetary The gains and losses from increase (decrease) in fair value of derivatives included in earnings. false false false false false false false false false 1 false true 229000000 229 false false 2 false true 5000000 5 false false 3 false true 6000000 6 false false The gains and losses from increase (decrease) in fair value of derivatives included in earnings. No authoritative reference available. false 22 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 true 0 0 false false 3 false true -300000000 -300 false false No definition available. No authoritative reference available. false 23 Uncertain tax positions 3 fe_UncertainTaxPositions fe false na duration monetary The net change in uncertain tax positions that affected the Company's effective tax rate. false false false false false false false false false 1 false true -210000000 -210 false false 2 false true -5000000 -5 false false 3 false true 19000000 19 false false The net change in uncertain tax positions that affected the Company's effective tax rate. No authoritative reference available. false 24 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 3 false false 0 0 false false No definition available. false 25 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 75000000 75 false false 2 false true -29000000 -29 false false 3 false true -136000000 -136 false false No definition available. No authoritative reference available. false 26 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 -11000000 -11 false false 2 false true -52000000 -52 false false 3 false true 79000000 79 false false No definition available. No authoritative reference available. false 27 Prepayments and other current assets 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 -19000000 -19 false false 2 false true -263000000 -263 false false 3 false true 10000000 10 false false No definition available. No authoritative reference available. false 28 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 3 false false 0 0 false false No definition available. false 29 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 50000000 50 false false 2 false true 10000000 10 false false 3 false true 51000000 51 false false No definition available. No authoritative reference available. false 30 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 -103000000 -103 false false 2 false true -39000000 -39 false false 3 false true 48000000 48 false false No definition available. No authoritative reference available. false 31 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 67000000 67 false false 2 false true 4000000 4 false false 3 false true -8000000 -8 false false No definition available. No authoritative reference available. false 32 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 -47000000 -47 false false 2 false true 7000000 7 false false 3 false true 75000000 75 false false No definition available. No authoritative reference available. false 33 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 2465000000 2465 false false 2 false true 2224000000 2224 false false 3 false true 1699000000 1699 false false No definition available. No authoritative reference available. true 35 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 3 false false 0 0 false false No definition available. false 36 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 4632000000 4632 false false 2 false true 1367000000 1367 false false 3 false true 1520000000 1520 false false No definition available. No authoritative reference available. false 37 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 true 0 0 false false 2 false true 1494000000 1494 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 38 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 3 false false 0 0 false false No definition available. false 39 Common stock 3 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 0 0 false false 3 false true -969000000 -969 false false No definition available. No authoritative reference available. false 40 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 -2610000000 -2610 false false 2 false true -1034000000 -1034 false false 3 false true -1070000000 -1070 false false No definition available. No authoritative reference available. false 41 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 -1246000000 -1246 false false 2 false true 0 0 false false 3 false true -205000000 -205 false false No definition available. No authoritative reference available. false 42 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 -670000000 -670 false false 2 false true -671000000 -671 false false 3 false true -616000000 -616 false false No definition available. No authoritative reference available. false 43 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 -57000000 -57 false false 2 false true 19000000 19 false false 3 false true -7000000 -7 false false No definition available. No authoritative reference available. false 44 Net cash provided from (used for) 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 49000000 49 false false 2 false true 1175000000 1175 false false 3 false true -1347000000 -1347 false false No definition available. No authoritative reference available. true 45 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 3 false false 0 0 false false No definition available. false 46 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 -2203000000 -2203 false false 2 false true -2888000000 -2888 false false 3 false true -1633000000 -1633 false false No definition available. No authoritative reference available. false 47 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 21000000 21 false false 2 false true 72000000 72 false false 3 false true 42000000 42 false false No definition available. No authoritative reference available. false 48 Proceeds from sale and leaseback transaction 2 us-gaap_SaleLeasebackTransactionGrossProceeds us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 0 0 false false 3 false true 1329000000 1329 false false No definition available. No authoritative reference available. false 49 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 2229000000 2229 false false 2 false true 1656000000 1656 false false 3 false true 1294000000 1294 false false No definition available. No authoritative reference available. false 50 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 -2306000000 -2306 false false 2 false true -1749000000 -1749 false false 3 false true -1397000000 -1397 false false No definition available. No authoritative reference available. false 51 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 60000000 60 false false 2 false true 60000000 60 false false 3 false true 72000000 72 false false No definition available. No authoritative reference available. false 52 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 14000000 14 false false 2 false true -134000000 -134 false false 3 false true -20000000 -20 false false No definition available. No authoritative reference available. false 53 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 -2185000000 -2185 false false 2 false true -2983000000 -2983 false false 3 false true -313000000 -313 false false No definition available. No authoritative reference available. true 54 Net increase 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 329000000 329 false false 2 false true 416000000 416 false false 3 false true 39000000 39 false false No definition available. No authoritative reference available. true 55 Cash and cash equivalents at beginning of year 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 3 false true 90000000 90 false false No definition available. No authoritative reference available. false 56 Cash and cash equivalents at end of year 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 874000000 874 false false 2 false true 545000000 545 false false 3 false true 129000000 129 false false No definition available. No authoritative reference available. false 58 Cash Paid During the Year- 2 fe_CashPaidDuringYearAbstract 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 3 false false 0 0 false false No definition available. false 59 Interest (net of amounts capitalized) 3 us-gaap_InterestPaidNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 718000000 718 false false 2 false true 667000000 667 false false 3 false true 744000000 744 false false No definition available. No authoritative reference available. false 60 Income taxes 3 us-gaap_IncomeTaxesPaidNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 173000000 173 false false 2 true true 685000000 685 false false 3 true true 710000000 710 false false No definition available. No authoritative reference available. false false 3 56 false Millions UnKnown UnKnown false true