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Consolidated Statements of Comprehensive Income (FirstEnergy Corp.) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 205	$ 328
OTHER COMPREHENSIVE INCOME:
Pension and OPEB prior service costs	(18)	(18)
Amortized losses on derivative hedges	3	2
Change in unrealized gains on available-for-sale securities	16	28
Other comprehensive income	1	12
Income taxes on other comprehensive income	0	4
Other comprehensive income, net of tax	1	8
COMPREHENSIVE INCOME	$ 206	$ 336

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