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Consolidated Statements of Comprehensive Income (Loss) (FirstEnergy Corp.) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 396	$ 380	$ 775	$ (381)
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(19)	(18)	(55)	(54)
Amortized losses on derivative hedges	4	2	8	6
Change in unrealized gains on available-for-sale securities	(6)	4	8	67
Other comprehensive income (loss)	(21)	(12)	(39)	19
Income taxes (benefits) on other comprehensive income (loss)	(9)	(5)	(16)	6
Other comprehensive income (loss), net of tax	(12)	(7)	(23)	13
COMPREHENSIVE INCOME (LOSS)	$ 384	$ 373	$ 752	$ (368)

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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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