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Consolidated Balance Sheets (FirstEnergy Solutions Corp.) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Common stockholders' equity-    
Common stock, shares authorized 490,000,000 490,000,000
Common stock, shares outstanding 425,198,228 423,560,397
Customer [Member]    
Receivables-    
Allowance for uncollectible accounts (in dollars) $ 63 $ 69
Other Receivables [Member]    
Receivables-    
Allowance for uncollectible accounts (in dollars) $ 3 $ 5
FES    
Common stockholders' equity-    
Common stock, no par value (in dollars per share)
Common stock, shares authorized 750 750
Common stock, shares outstanding 7 7
FES | Customer [Member]    
Receivables-    
Allowance for uncollectible accounts (in dollars) $ 7 $ 8
FES | Other Receivables [Member]    
Receivables-    
Allowance for uncollectible accounts (in dollars) $ 3 $ 3