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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

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