1.0.0.3 false CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data 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 REVENUES: 1 us-gaap_RevenuesAbstract 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 Electric utilities 2 us-gaap_ElectricDomesticRegulatedRevenue us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 11139000000 11139 false false 2 true true 12061000000 12061 false false 3 true true 11305000000 11305 false false No definition available. No authoritative reference available. false 5 Unregulated businesses 2 us-gaap_ElectricWorldwideUnregulatedRevenue us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1828000000 1828 false false 2 false true 1566000000 1566 false false 3 false true 1497000000 1497 false false No definition available. No authoritative reference available. false 6 Total revenues 2 us-gaap_Revenues us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 12967000000 12967 [1] false false 2 false true 13627000000 13627 [3] false false 3 false true 12802000000 12802 [2] false false No definition available. No authoritative reference available. true 7 EXPENSES: 1 us-gaap_CostsAndExpensesAbstract 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 8 Fuel 2 us-gaap_FuelCosts us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1153000000 1153 false false 2 false true 1340000000 1340 false false 3 false true 1178000000 1178 false false No definition available. No authoritative reference available. false 9 Purchased power 2 us-gaap_CostOfPurchasedPower us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 4730000000 4730 false false 2 false true 4291000000 4291 false false 3 false true 3836000000 3836 false false No definition available. No authoritative reference available. false 10 Other operating expenses 2 us-gaap_OperatingExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2697000000 2697 false false 2 false true 3045000000 3045 false false 3 false true 3083000000 3083 false false No definition available. No authoritative reference available. false 11 Provision for depreciation 2 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 12 Amortization of regulatory assets 2 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 13 Deferral of regulatory assets 2 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 14 General taxes 2 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 753000000 753 false false 2 false true 778000000 778 false false 3 false true 754000000 754 false false No definition available. No authoritative reference available. false 15 Total expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 11088000000 11088 false false 2 false true 10868000000 10868 false false 3 false true 9984000000 9984 false false No definition available. No authoritative reference available. true 16 OPERATING INCOME 1 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1879000000 1879 false false 2 false true 2759000000 2759 false false 3 false true 2818000000 2818 false false No definition available. No authoritative reference available. true 17 OTHER INCOME (EXPENSE): 1 fe_OtherIncomeExpenseAbstract 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 18 Investment income 2 us-gaap_InvestmentIncomeInterestAndDividend us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 204000000 204 false false 2 false true 59000000 59 false false 3 false true 120000000 120 false false No definition available. No authoritative reference available. false 19 Interest expense 2 us-gaap_InterestAndDebtExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -978000000 -978 false false 2 false true -754000000 -754 false false 3 false true -775000000 -775 false false No definition available. No authoritative reference available. false 20 Capitalized interest 2 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 130000000 130 false false 2 false true 52000000 52 false false 3 false true 32000000 32 false false No definition available. No authoritative reference available. false 21 Total other expense 2 fe_TotalOtherExpense fe false na duration monetary The total of other income and expense items resulting from secondary business-related activities, excluding those considered... false false false false false false false false false 1 false true -644000000 -644 false false 2 false true -643000000 -643 false false 3 false true -623000000 -623 false false The total of other income and expense items resulting from secondary business-related activities, excluding those considered part of the normal operations of the business that have not been previously categorized. No authoritative reference available. true 22 INCOME BEFORE INCOME TAXES 1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1235000000 1235 false false 2 false true 2116000000 2116 false false 3 false true 2195000000 2195 false false No definition available. No authoritative reference available. true 23 INCOME TAXES 1 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 245000000 245 false false 2 false true 777000000 777 false false 3 false true 883000000 883 false false No definition available. No authoritative reference available. false 24 NET INCOME 1 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 990000000 990 false false 2 false true 1339000000 1339 false false 3 false true 1312000000 1312 false false No definition available. No authoritative reference available. true 25 Less: Noncontrolling interest income (loss) 1 fe_NetIncomeLossAttributableToNoncontrollingInterestIncomeStatement fe false debit duration monetary The portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion... false false false false false false false false false 1 false true -16000000 -16 false false 2 false true -3000000 -3 false false 3 false true 3000000 3 false false The portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. No authoritative reference available. false 26 EARNINGS AVAILABLE TO FIRSTENERGY CORP. 1 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 1006000000 1006 false false 2 true true 1342000000 1342 false false 3 true true 1309000000 1309 false false No definition available. No authoritative reference available. false 27 BASIC EARNINGS PER SHARE OF COMMON STOCK 1 us-gaap_EarningsPerShareBasic us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 3.31 3.31 false false 2 true true 4.41 4.41 false false 3 true true 4.27 4.27 false false No definition available. No authoritative reference available. false 28 WEIGHTED AVERAGE NUMBER OF BASIC SHARES OUTSTANDING 1 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 304000000 304 false false 2 false true 304000000 304 false false 3 false true 306000000 306 false false No definition available. No authoritative reference available. false 29 DILUTED EARNINGS PER SHARE OF COMMON STOCK 1 us-gaap_EarningsPerShareDiluted us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 3.29 3.29 false false 2 true true 4.38 4.38 false false 3 true true 4.22 4.22 false false No definition available. No authoritative reference available. false 30 WEIGHTED AVERAGE NUMBER OF DILUTED SHARES OUTSTANDING 1 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 306000000 306 false false 2 false true 307000000 307 false false 3 false true 310000000 310 false false No definition available. No authoritative reference available. false 1 Includes $395 million of excise tax collections. 2 Includes $425 million of excise tax collections. 3 Includes $432 million of excise tax collections. false 3 28 false Millions Millions Hundreds false true