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Stock-Based Compensation Plans (Details Textuals) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
award
form
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock based compensation programs 4fe_NumberOfStockBasedCompensationPrograms    
Maximum limit of total stock awards (in shares) 29,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
Stock-based compensation award number of shares available for future 1,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Realized tax benefits $ 13us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions $ 13us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions $ 22us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Number of types of restricted stock unit awards 2fe_NumberOfRestrictedStockUnitsAwards    
Total intrinsic value of options exercised 1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue    
Intrinsic value of shares outstanding 3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Share-based liabilities paid 3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
Tax benefit associated with stock-based compensation expense 14us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 23us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 11us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
EDCP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferral period 3 years    
DCPD      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Compensation Liability, Classified, Noncurrent 8us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= fe_DeferredCompensationPlanDirectorsMember
7us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= fe_DeferredCompensationPlanDirectorsMember
 
Restricted Stock and Restricted Stock Units Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock granted (in shares) 1,171,318us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= fe_RestrictedStockAndRestrictedStockUnitsAwardsMember
   
Unrecognized cost 31us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= fe_RestrictedStockAndRestrictedStockUnitsAwardsMember
   
Unrecognized cost, period for recognition   2 years  
Restricted Stock And Restricted Stock Units Awards, Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock granted (in shares) 259,812us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= fe_RestrictedStockAndRestrictedStockUnitsAwardsPerformanceUnitsMember
   
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from options exercised $ 1us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 19us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 50us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation award vesting period   3 years  
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation award vesting period   1 year  
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation award vesting period   10 years  
401(k) Savings Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for issuance 756,412us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= fe_FourHundredAndOneKSavingsPlanMember
   
Contributed to participants accounts (in shares)   708,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_PlanNameAxis
= fe_FourHundredAndOneKSavingsPlanMember
543,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_PlanNameAxis
= fe_FourHundredAndOneKSavingsPlanMember