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 false 4 $ 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 5 REVENUES: 3 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 4 false false 0 0 false false No definition available. false 6 Electric utilities 4 us-gaap_ElectricDomesticRegulatedRevenue us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 2940000000 2940 false false 2 true true 3469000000 3469 false false 3 true true 8751000000 8751 false false 4 true true 9247000000 9247 false false No definition available. No authoritative reference available. false 7 Unregulated businesses 4 us-gaap_ElectricWorldwideUnregulatedRevenue us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 468000000 468 false false 2 false true 435000000 435 false false 3 false true 1262000000 1262 false false 4 false true 1179000000 1179 false false No definition available. No authoritative reference available. false 8 Total revenues 4 us-gaap_Revenues us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 3408000000 3408 [1] false false 2 false true 3904000000 3904 [2] false false 3 false true 10013000000 10013 [3] false false 4 false true 10426000000 10426 [4] false false No definition available. No authoritative reference available. true 9 EXPENSES: 3 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 4 false false 0 0 false false No definition available. false 10 Fuel 4 us-gaap_FuelCosts us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 302000000 302 false false 2 false true 356000000 356 false false 3 false true 890000000 890 false false 4 false true 1000000000 1000 false false No definition available. No authoritative reference available. false 11 Purchased power 4 us-gaap_CostOfPurchasedPower us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1313000000 1313 false false 2 false true 1306000000 1306 false false 3 false true 3480000000 3480 false false 4 false true 3376000000 3376 false false No definition available. No authoritative reference available. false 12 Other operating expenses 4 us-gaap_OperatingExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 665000000 665 false false 2 false true 794000000 794 false false 3 false true 2103000000 2103 false false 4 false true 2374000000 2374 false false No definition available. No authoritative reference available. false 13 Provision for depreciation 4 us-gaap_DepreciationNonproduction us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 188000000 188 false false 2 false true 168000000 168 false false 3 false true 550000000 550 false false 4 false true 500000000 500 false false No definition available. No authoritative reference available. false 14 Amortization of regulatory assets 4 us-gaap_AmortizationOfRegulatoryAsset us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 261000000 261 false false 2 false true 291000000 291 false false 3 false true 903000000 903 false false 4 false true 795000000 795 false false No definition available. No authoritative reference available. false 15 Deferral of regulatory assets 4 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 false 0 0 false false 2 false true -58000000 -58 false false 3 false true -136000000 -136 false false 4 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 16 General taxes 4 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 192000000 192 false false 2 false true 201000000 201 false false 3 false true 587000000 587 false false 4 false true 596000000 596 false false No definition available. No authoritative reference available. false 17 Total expenses 4 us-gaap_CostsAndExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2921000000 2921 false false 2 false true 3058000000 3058 false false 3 false true 8377000000 8377 false false 4 false true 8380000000 8380 false false No definition available. No authoritative reference available. true 18 OPERATING INCOME 3 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 487000000 487 false false 2 false true 846000000 846 false false 3 false true 1636000000 1636 false false 4 false true 2046000000 2046 false false No definition available. No authoritative reference available. true 19 OTHER INCOME (EXPENSE): 3 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 4 false false 0 0 false false No definition available. false 20 Investment income 4 us-gaap_InvestmentIncomeInterestAndDividend us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 191000000 191 false false 2 false true 40000000 40 false false 3 false true 207000000 207 false false 4 false true 73000000 73 false false No definition available. No authoritative reference available. false 21 Interest expense 4 us-gaap_InterestAndDebtExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -355000000 -355 false false 2 false true -192000000 -192 false false 3 false true -755000000 -755 false false 4 false true -559000000 -559 false false No definition available. No authoritative reference available. false 22 Capitalized interest 4 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 35000000 35 false false 2 false true 15000000 15 false false 3 false true 96000000 96 false false 4 false true 36000000 36 false false No definition available. No authoritative reference available. false 23 Total other expense 4 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 -129000000 -129 false false 2 false true -137000000 -137 false false 3 false true -452000000 -452 false false 4 false true -450000000 -450 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 24 INCOME BEFORE INCOME TAXES 3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 358000000 358 false false 2 false true 709000000 709 false false 3 false true 1184000000 1184 false false 4 false true 1596000000 1596 false false No definition available. No authoritative reference available. true 25 INCOME TAXES 3 us-gaap_IncomeTaxExpenseBenefit 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 238000000 238 false false 3 false true 430000000 430 false false 4 false true 585000000 585 false false No definition available. No authoritative reference available. false 26 NET INCOME 3 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 230000000 230 false false 2 false true 471000000 471 false false 3 false true 754000000 754 false false 4 false true 1011000000 1011 false false No definition available. No authoritative reference available. true 27 Less: Noncontrolling interest income (loss) 3 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 -4000000 -4 false false 2 false false 0 0 false false 3 false true -14000000 -14 false false 4 false true 1000000 1 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 28 EARNINGS AVAILABLE TO FIRSTENERGY CORP. 3 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 234000000 234 false false 2 true true 471000000 471 false false 3 true true 768000000 768 false false 4 true true 1010000000 1010 false false No definition available. No authoritative reference available. false 29 BASIC EARNINGS PER SHARE OF COMMON STOCK 3 us-gaap_EarningsPerShareBasic us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.77 0.77 false false 2 true true 1.55 1.55 false false 3 true true 2.52 2.52 false false 4 true true 3.32 3.32 false false No definition available. No authoritative reference available. false 30 WEIGHTED AVERAGE NUMBER OF BASIC SHARES OUTSTANDING 3 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 304000000 304 false false 4 false true 304000000 304 false false No definition available. No authoritative reference available. false 31 DILUTED EARNINGS PER SHARE OF COMMON STOCK 3 us-gaap_EarningsPerShareDiluted us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.77 0.77 false false 2 true true 1.54 1.54 false false 3 true true 2.51 2.51 false false 4 true true 3.29 3.29 false false No definition available. No authoritative reference available. false 32 WEIGHTED AVERAGE NUMBER OF DILUTED SHARES OUTSTANDING 3 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 306000000 306 false false 4 false true 307000000 307 false false No definition available. No authoritative reference available. false 33 DIVIDENDS DECLARED PER SHARE OF COMMON STOCK 3 us-gaap_CommonStockDividendsPerShareDeclared us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 1.1 1.1 false false 2 true true 1.1 1.1 false false 3 true true 1.65 1.65 false false 4 true true 1.65 1.65 false false No definition available. No authoritative reference available. false 1 Includes $106 million of excise tax collections. 2 Includes $115 milion of excise tax collections. 3 Includes $310 million of excise tax collections. 4 Includes $329 million of excise tax collections. false 4 29 false Millions Millions Hundreds false true