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Capitalization (Details Textuals) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2014
subsidiary
Dec. 31, 2013
Dec. 31, 2012
Jan. 20, 2015
Mar. 31, 2014
credit_facility
Apr. 01, 2014
Jan. 31, 2015
Mar. 29, 2014
Sep. 25, 2014
Dec. 11, 2014
May 19, 2014
Dec. 01, 2014
Jun. 11, 2014
Apr. 02, 2014
Nov. 25, 2014
Debt Instrument [Line Items]                                            
Retained earnings (accumulated deficit) $ 2,285,000,000us-gaap_RetainedEarningsAccumulatedDeficit       $ 2,590,000,000us-gaap_RetainedEarningsAccumulatedDeficit     $ 2,285,000,000us-gaap_RetainedEarningsAccumulatedDeficit $ 2,590,000,000us-gaap_RetainedEarningsAccumulatedDeficit                          
Dividends declared, in dollars per share               $ 1.44us-gaap_CommonStockDividendsPerShareDeclared $ 1.65us-gaap_CommonStockDividendsPerShareDeclared $ 2.20us-gaap_CommonStockDividendsPerShareDeclared                        
Common stock dividends per share paid $ 0.36us-gaap_CommonStockDividendsPerShareCashPaid $ 0.36us-gaap_CommonStockDividendsPerShareCashPaid $ 0.36us-gaap_CommonStockDividendsPerShareCashPaid $ 0.36us-gaap_CommonStockDividendsPerShareCashPaid $ 0.55us-gaap_CommonStockDividendsPerShareCashPaid $ 0.55us-gaap_CommonStockDividendsPerShareCashPaid $ 0.55us-gaap_CommonStockDividendsPerShareCashPaid                              
FERC-defined equity to total capitalization ratio               35.00%fe_MinimumEquityToTotalCapitalizationRatioToBeMaintainedForPaymentOfCapitalDividend                            
Preferred shares shares outstanding 0us-gaap_PreferredStockSharesOutstanding       0us-gaap_PreferredStockSharesOutstanding     0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding                          
Preference shares outstanding 0fe_PreferenceStockSharesOutstanding       0fe_PreferenceStockSharesOutstanding     0fe_PreferenceStockSharesOutstanding 0fe_PreferenceStockSharesOutstanding                          
Loss on debt redemptions               (8,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt (132,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt                        
Number of subsidiaries that issued environmental control bonds               2fe_NumberOfSubsidiariesThatIssuedEnvironmentalControlBonds                            
Environmental control bonds outstanding 450,000,000us-gaap_LongtermPollutionControlBondCurrentAndNoncurrent       472,000,000us-gaap_LongtermPollutionControlBondCurrentAndNoncurrent     450,000,000us-gaap_LongtermPollutionControlBondCurrentAndNoncurrent 472,000,000us-gaap_LongtermPollutionControlBondCurrentAndNoncurrent                          
Transition bond outstanding 168,000,000us-gaap_LongtermTransitionBondCurrentAndNoncurrent       207,000,000us-gaap_LongtermTransitionBondCurrentAndNoncurrent     168,000,000us-gaap_LongtermTransitionBondCurrentAndNoncurrent 207,000,000us-gaap_LongtermTransitionBondCurrentAndNoncurrent                          
Principal default amount specified in debt covenants               100,000,000fe_PrincipalDefaultAmountSpecifiedInDebtCovenants                            
Subsequent Event                                            
Debt Instrument [Line Items]                                            
Dividends declared, in dollars per share                     $ 0.36us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                      
Maximum amount borrowed under revolving credit facility                           6,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                
Revolving Credit Facility                                            
Debt Instrument [Line Items]                                            
Number of credit facilities extended       3fe_LineofCreditFacilityNumberofCreditFacilitiesExtended
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		               3fe_LineofCreditFacilityNumberofCreditFacilitiesExtended
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		                    
Phase In Recovery Bonds                                            
Debt Instrument [Line Items]                                            
Long-term debt and other long-term obligations 386,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fe_PhaseInRecoveryBondsMember		       445,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fe_PhaseInRecoveryBondsMember		     386,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fe_PhaseInRecoveryBondsMember		 445,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fe_PhaseInRecoveryBondsMember		                          
Loans Payable | Variable Rate Term Loan Due 2019                                            
Debt Instrument [Line Items]                                            
Face amount of loan       1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_VariableRateTermLoanDueTwoThousandNineteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember		               1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_VariableRateTermLoanDueTwoThousandNineteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember		                    
AGC                                            
Debt Instrument [Line Items]                                            
FERC-defined equity to total capitalization ratio               45.00%fe_MinimumEquityToTotalCapitalizationRatioToBeMaintainedForPaymentOfCapitalDividend
/ dei_LegalEntityAxis
= fe_AgcMember		                            
Parent Company | Revolving Credit Facility                                            
Debt Instrument [Line Items]                                            
Increase (decrease) in maximum borrowing capacity       1,000,000,000fe_LineofCreditFacilityMaximumBorrowingCapacityIncreaseDecrease
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		               1,000,000,000fe_LineofCreditFacilityMaximumBorrowingCapacityIncreaseDecrease
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                    
Loss on debt redemptions               (5,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                            
ATSI                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_AtsiMember		             500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_AtsiMember		                            
ATSI | Revolving Credit Facility                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility       500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_AtsiMember		               500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_AtsiMember		     100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_AtsiMember		              
ATSI | Senior Notes | 5% Senior Notes Due 2044                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)                               5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_FivePercentSeniorNotesDue2044Member
/ dei_LegalEntityAxis
= fe_AtsiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		            
Face amount of loan                               400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_FivePercentSeniorNotesDue2044Member
/ dei_LegalEntityAxis
= fe_AtsiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		            
TrAIL                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility 400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_TrailMember		             400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_TrailMember		                            
TrAIL | Revolving Credit Facility                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility       400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_TrailMember		               400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_TrailMember		     200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_TrailMember		              
TrAIL | Senior Notes | 3.85% Senior Notes Due 2025                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)                                 3.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_SeniorNotesThreePointEightFivePercentDueTwentyTwentyFiveMember
/ dei_LegalEntityAxis
= fe_TrailMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
Face amount of loan                                 550,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_SeniorNotesThreePointEightFivePercentDueTwentyTwentyFiveMember
/ dei_LegalEntityAxis
= fe_TrailMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
TrAIL | Senior Notes | 4% Senior Notes Due January 2015                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)                                 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_SeniorNotesFourPercentDueJanuaryTwentyFifteenMember
/ dei_LegalEntityAxis
= fe_TrailMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
Debt repurchased                                 450,000,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= fe_SeniorNotesFourPercentDueJanuaryTwentyFifteenMember
/ dei_LegalEntityAxis
= fe_TrailMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
FE                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility 3,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= us-gaap_ParentMember		             3,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= us-gaap_ParentMember		                            
FE | Revolving Credit Facility                                            
Debt Instrument [Line Items]                                            
Increase (decrease) in maximum borrowing capacity       1,000,000,000fe_LineofCreditFacilityMaximumBorrowingCapacityIncreaseDecrease
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentMember		               1,000,000,000fe_LineofCreditFacilityMaximumBorrowingCapacityIncreaseDecrease
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentMember		                    
FE | Revolving Credit Facility | Subsequent Event                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility                           3,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                
FE | Loans Payable | Term Loan Due December 2016                                            
Debt Instrument [Line Items]                                            
Face amount of loan 200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_TermLoanDueDecemberTwentySixteenMember
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember		             200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_TermLoanDueDecemberTwentySixteenMember
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember		                            
FES                                            
Debt Instrument [Line Items]                                            
Retained earnings (accumulated deficit) 1,934,000,000us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= fe_FesMember		       2,178,000,000us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= fe_FesMember		     1,934,000,000us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= fe_FesMember		 2,178,000,000us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= fe_FesMember		                          
Maximum amount borrowed under revolving credit facility 1,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_FesMember		             1,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_FesMember		                            
Loss on debt redemptions               (6,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= fe_FesMember		 (103,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= fe_FesMember		 0us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= fe_FesMember		                        
Equity contribution from parent       500,000,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= fe_FesMember		       500,000,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= fe_FesMember		 1,500,000,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= fe_FesMember		 0us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= fe_FesMember		                        
FES | Revolving Credit Facility                                            
Debt Instrument [Line Items]                                            
Loss on debt redemptions               (3,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_FesMember		                            
FES | PCRB | Variable Rate PCRB                                            
Debt Instrument [Line Items]                                            
Face amount of loan 92,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_VariableRatePollutionControlRevenueBondMember
/ dei_LegalEntityAxis
= fe_FesMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		             92,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_VariableRatePollutionControlRevenueBondMember
/ dei_LegalEntityAxis
= fe_FesMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                            
FET                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility 1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_FetMember		             1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_FetMember		                            
FET | Revolving Credit Facility | Subsequent Event                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility                           1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_FetMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                
FET | Senior Notes | Senior Notes, 4.35% due 2024                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)                                   4.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_A4.35Seniornotesdue2024Member
/ dei_LegalEntityAxis
= fe_FetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Face amount of loan                                   600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_A4.35Seniornotesdue2024Member
/ dei_LegalEntityAxis
= fe_FetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
FET | Senior Notes | Senior Notes, 5.45% due 2044                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)                                   5.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_A5.45SeniorNotesdue2044Member
/ dei_LegalEntityAxis
= fe_FetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Face amount of loan                                   400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_A5.45SeniorNotesdue2044Member
/ dei_LegalEntityAxis
= fe_FetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
FES / AE Supply | Revolving Credit Facility                                            
Debt Instrument [Line Items]                                            
Increase (decrease) in maximum borrowing capacity       (1,000,000,000)fe_LineofCreditFacilityMaximumBorrowingCapacityIncreaseDecrease
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_FesAndAeSupplyMember		               (1,000,000,000)fe_LineofCreditFacilityMaximumBorrowingCapacityIncreaseDecrease
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_FesAndAeSupplyMember		                    
FES / AE Supply | Revolving Credit Facility | Subsequent Event                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility                           1,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= fe_FesAndAeSupplyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                
FG                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)       3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember		               3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember		                    
FG | PCRB                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)     3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                      
Amount of debt redeemed       197,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		               197,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                    
Maturities of subordinated debt       50,000,000us-gaap_MaturitiesOfSubordinatedDebt
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                    
Face amount of loan   140,100,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		 57,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		 235,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		               235,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                    
FG | PCRB | PCRB Put Date March 1, 2019                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)   3.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_PollutionControlRevenueBondPutDateMarch12019Member
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
Face amount of loan   50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_PollutionControlRevenueBondPutDateMarch12019Member
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
FG | PCRB | PCRB Maturity Date May 15, 2019                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)   3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_PollutionControlRevenueBondMaturityDateMay152019Member
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
Face amount of loan   90,100,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_PollutionControlRevenueBondMaturityDateMay152019Member
/ dei_LegalEntityAxis
= fe_FirstEnergyGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
NG                                            
Debt Instrument [Line Items]                                            
Amount of debt redeemed                                     26,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember		      
NG | PCRB                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)     3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		               4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                    
Amount of debt redeemed       16,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		               16,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                    
Face amount of loan   101,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		 164,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		 182,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		               182,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                    
NG | PCRB | 3.63% PCRB                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)   3.63%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_ThreePointSixThreePercentPollutionControlRevenueBondMember
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
Face amount of loan   45,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_ThreePointSixThreePercentPollutionControlRevenueBondMember
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
NG | PCRB | PCRB Put Date June 1, 2020                                            
Debt Instrument [Line Items]                                            
Face amount of loan   15,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_PollutionControlRevenueBondPutDateJune12020Member
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
NG | PCRB | PCRB Put Date April 1, 2020                                            
Debt Instrument [Line Items]                                            
Face amount of loan   29,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_PollutionControlRevenueBondPutDateApril12020Member
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
NG | PCRB | PCRB Put Date May 1, 2020                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)   3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_PollutionControlRevenueBondPutDateMay12020Member
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
Face amount of loan   56,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_PollutionControlRevenueBondPutDateMay12020Member
/ dei_LegalEntityAxis
= fe_FirstEnergyNuclearGenerationLLCMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                                        
ME                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility 300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_MetEdMember		             300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_MetEdMember		                            
ME | Senior Notes | Senior Notes, 4% Due 2025                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)                                       4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_FourPercentSeniorNotesDueTwentyTwentyFiveMember
/ dei_LegalEntityAxis
= fe_MetEdMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Face amount of loan                                       250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_FourPercentSeniorNotesDueTwentyTwentyFiveMember
/ dei_LegalEntityAxis
= fe_MetEdMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
ME | PCRB                                            
Debt Instrument [Line Items]                                            
Amount of debt redeemed                                         29,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ dei_LegalEntityAxis
= fe_MetEdMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		  
Maturities of subordinated debt                         150,000,000us-gaap_MaturitiesOfSubordinatedDebt
/ dei_LegalEntityAxis
= fe_MetEdMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                  
AE Supply                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility 1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_AeSupplyMember		             1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_AeSupplyMember		                            
Return of capital       500,000,000us-gaap_PaymentsOfCapitalDistribution
/ dei_LegalEntityAxis
= fe_AeSupplyMember		                                    
PE                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility 150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_PeMember		             150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_PeMember		                            
PE | FMBs | 4.44% First Mortgage Bond Due November 2024                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)                                           4.44%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_FirstMortgageBondFourPointFourFourPercentDueNovemberTwentyFortyFourMember
/ dei_LegalEntityAxis
= fe_PeMember
/ us-gaap_LongtermDebtTypeAxis
= fe_FirstMortgageBondMember
Face amount of loan                                           200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_FirstMortgageBondFourPointFourFourPercentDueNovemberTwentyFortyFourMember
/ dei_LegalEntityAxis
= fe_PeMember
/ us-gaap_LongtermDebtTypeAxis
= fe_FirstMortgageBondMember
PE | FMBs | First Mortgage Bond Due November 2014                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)                                           5.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_FirstMortgageBondDueNovemberTwentyFourteenMember
/ dei_LegalEntityAxis
= fe_PeMember
/ us-gaap_LongtermDebtTypeAxis
= fe_FirstMortgageBondMember
Amount of debt redeemed                                           175,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_FirstMortgageBondDueNovemberTwentyFourteenMember
/ dei_LegalEntityAxis
= fe_PeMember
/ us-gaap_LongtermDebtTypeAxis
= fe_FirstMortgageBondMember
PN | Senior Notes | 4.15% Senior Notes Due 2025                                            
Debt Instrument [Line Items]                                            
Interest rate (percent)                                       4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fe_FourPointOneFivePercentSeniorNotesDueTwentyTwentyFiveMember
/ dei_LegalEntityAxis
= fe_PennsylvaniaElectricCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Face amount of loan                                       200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_FourPointOneFivePercentSeniorNotesDueTwentyTwentyFiveMember
/ dei_LegalEntityAxis
= fe_PennsylvaniaElectricCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
PN | PCRB                                            
Debt Instrument [Line Items]                                            
Amount of debt redeemed                         45,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ dei_LegalEntityAxis
= fe_PennsylvaniaElectricCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fe_PcrbMember		                  
Ohio Funding Companies | Phase In Recovery Bonds                                            
Debt Instrument [Line Items]                                            
Face amount of loan     445,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fe_PhaseInRecoveryBondsMember
/ dei_LegalEntityAxis
= fe_OhioFundingCompaniesMember		                                      
Penn                                            
Debt Instrument [Line Items]                                            
Maximum amount borrowed under revolving credit facility 50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_PennMember		             50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= fe_PennMember		                            
Annual sinking fund requirement for FMB               $ 8,000,000us-gaap_DebtInstrumentSinkingFundPayment
/ dei_LegalEntityAxis
= fe_PennMember		                            
Common Stock                                            
Debt Instrument [Line Items]                                            
Stock issuance - employee benefits, Shares               2,474,011us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 412,122us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember