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Consolidated Statements of Comprehensive Income (Loss) (FirstEnergy Corp.) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,089)	$ 187	$ (761)	$ 409
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(18)	(32)	(36)	(63)
Amortized (gains) losses on derivative hedges	2	1	4	2
Change in unrealized gains on available-for-sale securities	35	(14)	63	(10)
Other comprehensive income (loss)	19	(45)	31	(71)
Income taxes (benefits) on other comprehensive income (loss)	7	(17)	11	(27)
Other comprehensive income (loss), net of tax	12	(28)	20	(44)
COMPREHENSIVE INCOME (LOSS)	$ (1,077)	$ 159	$ (741)	$ 365

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OTHER COMPREHENSIVE INCOME:.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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