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Pension and Other Postemployment Benefits (Details 7)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target Asset Allocations 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Equities    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target Asset Allocations 42.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember		 26.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
Fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target Asset Allocations 32.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember		 40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= us-gaap_FixedIncomeFundsMember
Absolute return strategies    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target Asset Allocations 14.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= fe_AbsoluteReturnStrategiesMember		 22.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= fe_AbsoluteReturnStrategiesMember
Real estate    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target Asset Allocations 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_RealEstateMember		 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= us-gaap_RealEstateMember
Alternative Investments [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target Asset Allocations 1.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= fe_AlternativeInvestmentsMember		 1.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= fe_AlternativeInvestmentsMember
Cash    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target Asset Allocations 6.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember		 6.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= us-gaap_CashMember