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Consolidated Balance Sheets (FirstEnergy Corp.) (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Common stockholders' equity- |  |
Common stock, par value (in dollars per share) | $ 0.1 | $ 0.1
Common stock, shares authorized | 490,000,000 | 490,000,000
Common stock, shares outstanding | 425,743,282 | 423,560,397
Customer |  |
Receivables- |  |
Allowance for uncollectible accounts (in dollars) | $ 61 | $ 69
Other |  |
Receivables- |  |
Allowance for uncollectible accounts (in dollars) | $ 3 | $ 5

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