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Consolidated Balance Sheets (FirstEnergy Corp.) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 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	444,858,003	442,344,218
Customer
Receivables-
Allowance for uncollectible accounts (in dollars)	$ 52	$ 53
Other
Receivables-
Allowance for uncollectible accounts (in dollars)	$ 1	$ 1

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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