Consolidated Statements of Comprehensive Income (Unaudited) (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Income and Comprehensive Income [Abstract]
NET INCOME	$ 425	$ 530	$ 919	$ 770
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(47)	(48)	(148)	(44)
Amortized gain (loss) on derivative hedges	0	2	1	13
Change in unrealized gain on available-for-sale securities	1	(26)	13	(7)
Other comprehensive income (loss)	(46)	(72)	(134)	(38)
Income taxes (benefits) on other comprehensive income (loss)	(24)	(26)	(75)	(12)
Other comprehensive income (loss), net of tax	(22)	(46)	(59)	(26)
COMPREHENSIVE INCOME	403	484	860	744
Comprehensive income (loss) attributable to noncontrolling interest	0	(2)	1	(17)
COMPREHENSIVE INCOME AVAILABLE TO FIRSTENERGY CORP.	$ 403	$ 486	$ 859	$ 761

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