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Consolidated Balance Sheets (FirstEnergy Corp.) (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Common stockholders’ equity- |  |
Common stock, par value (in dollars per share) | $ 0.1 | $ 0.1
Common stock, shares authorized | 700,000,000 | 490,000,000
Common stock, shares outstanding | 445,334,111 | 442,344,218
Customer [Member] |  |
Receivables- |  |
Allowance for uncollectible accounts (in dollars) | $ 51 | $ 53
Other [Member] |  |
Receivables- |  |
Allowance for uncollectible accounts (in dollars) | $ 1 | $ 1

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