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Consolidated Statements of Income (FirstEnergy Corp.) (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
Tax effect of discontinued operations $ 69us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 9us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 8us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Excise tax collections included in Revenue $ 420us-gaap_ExciseTaxesCollected $ 458us-gaap_ExciseTaxesCollected $ 484us-gaap_ExciseTaxesCollected