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Consolidated Balance Sheets (FirstEnergy Corp.) (Parenthetical) - USD ($) $ in Millions	Dec. 31, 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	442,344,218	423,560,397
Customer [Member]
Receivables-
Allowance for uncollectible accounts (in dollars)	$ 53	$ 69
Other [Member]
Receivables-
Allowance for uncollectible accounts (in dollars)	$ 1	$ 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 or stated value per share of common stock.

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