Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
NET INCOME	$ 306	$ 47
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(53)	(44)
Amortized losses on derivative hedges	(2)	(6)
Change in unrealized gain on available-for-sale securities	10	9
Other comprehensive loss	(45)	(41)
Income taxes (benefits) on other comprehensive income (loss)	(24)	(19)
Other comprehensive loss, net of tax	(21)	(22)
COMPREHENSIVE INCOME	285	25
Comprehensive loss attributable to noncontrolling interest	0	(5)
COMPREHENSIVE INCOME AVAILABLE TO FIRSTENERGY CORP.	285	30
FES
NET INCOME	122	45
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(5)	(10)
Amortized losses on derivative hedges	(5)	(9)
Change in unrealized gain on available-for-sale securities	10	8
Other comprehensive loss	0	(11)
Income taxes (benefits) on other comprehensive income (loss)	2	(6)
Other comprehensive loss, net of tax	(2)	(5)
COMPREHENSIVE INCOME	120	40
OE
NET INCOME	31	32
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(10)	(7)
Other comprehensive loss	(10)	(7)
Income taxes (benefits) on other comprehensive income (loss)	(5)	(4)
Other comprehensive loss, net of tax	(5)	(3)
COMPREHENSIVE INCOME	26	29
JCP&L
NET INCOME	26	23
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(6)	(6)
Other comprehensive loss	(6)	(6)
Income taxes (benefits) on other comprehensive income (loss)	(4)	(3)
Other comprehensive loss, net of tax	(2)	(3)
COMPREHENSIVE INCOME	$ 24	$ 20