Consolidated Statements of Income and Comprehensive Income (FirstEnergy Solutions Corp.) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
REVENUES:
Electric sales	$ 1,298		$ 1,432		$ 2,639		$ 2,882
Total revenues	3,519	[1]	3,755	[1]	7,248	[1]	7,745	[1]
OPERATING EXPENSES:
Fuel	628		656		1,258		1,197
Purchased power	862		1,042		1,805		2,301
Other operating expenses	887		921		1,771		1,739
Provision for depreciation	302		285		596		564
General taxes	241		232		506		504
Total operating expenses	3,465		3,198		6,540		6,442
OPERATING INCOME (LOSS)	54		557		708		1,303
OTHER INCOME (EXPENSE):
Loss on debt redemptions	(24)		0		(141)		0
Investment income (loss)	(15)		13		3		24
Interest expense	(256)		(274)		(514)		(520)
Capitalized interest	19		19		34		36
Total other income (expense)	(276)		(242)		(618)		(460)
INCOME (LOSSES) BEFORE INCOME TAXES	(222)		315		90		843
INCOME TAXES (BENEFITS)	(58)		127		58		349
NET INCOME (LOSS)	(164)		188		32		494
STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	(164)		188		32		494
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(55)		(48)		(101)		(101)
Amortized loss (gain) on derivative hedges	1		3		2		1
Change in unrealized gain on available-for-sale securities	(8)		2		(3)		12
Other comprehensive income (loss)	(62)		(43)		(102)		(88)
Income taxes (benefits) on other comprehensive income (loss)	(24)		(27)		(40)		(51)
Net other comprehensive income (loss)	(38)		(16)		(62)		(37)
COMPREHENSIVE INCOME (LOSS)	(202)		172		(30)		457
FES
REVENUES:
Other	35		27		69		54
Total revenues	1,459		1,456		2,989		2,972
OPERATING EXPENSES:
Fuel	332		380		632		675
Other operating expenses	388		393		768		688
Provision for depreciation	78		69		154		132
General taxes	34		32		71		69
Total operating expenses	1,493		1,441		2,923		2,735
OPERATING INCOME (LOSS)	(34)		15		66		237
OTHER INCOME (EXPENSE):
Loss on debt redemptions	(32)		0		(103)		0
Investment income (loss)	(18)		6		(1)		12
Miscellaneous income	6		20		8		24
Capitalized interest	10		9		19		18
Total other income (expense)	(78)		(15)		(174)		(39)
INCOME (LOSSES) BEFORE INCOME TAXES	(112)		0		(108)		198
INCOME TAXES (BENEFITS)	(41)		1		(39)		77
NET INCOME (LOSS)	(71)		(1)		(69)		121
STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	(71)		(1)		(69)		121
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(5)		8		(11)		3
Amortized loss (gain) on derivative hedges	(1)		1		(2)		(4)
Change in unrealized gain on available-for-sale securities	(8)		3		(3)		13
Other comprehensive income (loss)	(14)		12		(16)		12
Income taxes (benefits) on other comprehensive income (loss)	(5)		2		(6)		4
Net other comprehensive income (loss)	(9)		10		(10)		8
COMPREHENSIVE INCOME (LOSS)	(80)		9		(79)		129
FES | Affiliates
REVENUES:
Electric sales	140		107		296		230
OPERATING EXPENSES:
Purchased power	137		133		269		250
OTHER INCOME (EXPENSE):
Interest expense	(5)		(2)		(6)		(4)
FES | Non-Affiliates
REVENUES:
Electric sales	1,284		1,322		2,624		2,688
OPERATING EXPENSES:
Purchased power	524		434		1,029		921
OTHER INCOME (EXPENSE):
Interest expense	$ (39)		$ (48)		$ (91)		$ (89)

[1] Includes excise tax collections of $107 million in each of the three month periods ended June 30, 2013 and 2012 and $229 million and $228 million in the six months ended June 30, 2013 and 2012, respectively.