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Consolidated Statements of Income and Comprehensive Income (FirstEnergy Solutions Corp.) (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Tax effect of discontinued operations $ 69us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 9us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 8us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
FES      
Tax effect of discontinued operations $ 70us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ dei_LegalEntityAxis
= fe_FesMember
$ 8us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ dei_LegalEntityAxis
= fe_FesMember
$ 8us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ dei_LegalEntityAxis
= fe_FesMember