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Consolidated Balance Sheets (FirstEnergy Solutions Corp.) (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Common stockholders’ equity-
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
FES
Common stockholders’ equity-
Common stock, no par value
Common stock, shares authorized	750	750
Common stock, shares outstanding	7	7
FES | Customer [Member]
Receivables-
Allowance for uncollectible accounts (in dollars)	$ 2	$ 5

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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Face amount per share of no-par value common stock.

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