Consolidated Statements of Comprehensive Income (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Other Comprehensive Income [Abstract]
NET INCOME	$ 392	$ 771	$ 869
OTHER COMPREHENSIVE INCOME (LOSS):
Pensions and OPEB prior service costs	(160)	(115)	(90)
Amortized losses on derivative hedges	3	1	23
Change in unrealized gain on available-for-sale securities	(10)	(6)	19
Other comprehensive income (loss)	(167)	(120)	(48)
Income tax benefits on other comprehensive loss	(66)	(79)	(49)
Other comprehensive income (loss), net of tax	(101)	(41)	1
COMPREHENSIVE INCOME (LOSS)	291	730	870
Comprehensive income (loss) attributable to noncontrolling interest	0	1	(16)
COMPREHENSIVE INCOME AVAILABLE TO FIRSTENERGY CORP.	$ 291	$ 729	$ 886