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Fair Value Measurements (Details 6) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Carrying Value    
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations $ 19,828us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 17,049us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value    
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations 21,733us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 17,957us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
FES | Carrying Value    
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations 3,097us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= fe_FesMember		 3,001us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= fe_FesMember
FES | Fair Value    
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations $ 3,241us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= fe_FesMember		 $ 3,073us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= fe_FesMember