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Consolidated Statements of Income (Loss) (FirstEnergy Corp.) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Excise taxes collected $ 92 $ 96 $ 199 $ 211