Consolidated Statements of Income and Comprehensive Income (FirstEnergy Solutions Corp.) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
REVENUES:
Electric sales	$ 1,506		$ 1,382		$ 4,131		$ 4,247
Total revenues	4,036	[1]	4,052	[1]	11,270	[1]	11,780	[1]
OPERATING EXPENSES:
Fuel	657		636		1,915		1,833
Purchased power	1,120		1,063		2,932		3,367
Other operating expenses	877		861		2,645		2,597
Provision for depreciation	316		272		909		834
General taxes	242		257		747		760
Total operating expenses	3,524		3,150		10,064		9,589
OPERATING INCOME (LOSS)	512		902		1,206		2,191
OTHER INCOME (EXPENSE):
Loss on debt redemptions	9		0		(132)		0
Investment income (loss)	5		39		8		63
Interest expense	(257)		(230)		(771)		(750)
Capitalized interest	17		18		51		54
Total other income (expense)	(226)		(173)		(844)		(633)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	286		729		362		1,558
INCOME TAXES (BENEFITS)	77		307		129		650
NET INCOME FROM CONTINUING OPERATIONS	209		422		233		908
Discontinued operations (net of income taxes of $5, $3, $8 and $6, respectively) (Note 16)	9		3		17		11
NET INCOME (LOSS)	218		425		250		919
STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	218		425		250		919
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(47)		(47)		(148)		(148)
Amortized loss (gain) on derivative hedges	2		0		4		1
Change in unrealized gain on available-for-sale securities	6		1		3		13
Other comprehensive income (loss)	(39)		(46)		(141)		(134)
Income taxes (benefits) on other comprehensive income (loss)	(15)		(24)		(55)		(75)
Net other comprehensive income (loss)	(24)		(22)		(86)		(59)
COMPREHENSIVE INCOME (LOSS)	194		403		164		860
FES
REVENUES:
Other	38		37		107		91
Total revenues	1,679		1,550		4,655		4,511
OPERATING EXPENSES:
Fuel	304		303		936		978
Other operating expenses	339		342		1,105		1,028
Provision for depreciation	80		70		231		200
General taxes	35		35		106		104
Total operating expenses	1,614		1,383		4,534		4,116
OPERATING INCOME (LOSS)	65		167		121		395
OTHER INCOME (EXPENSE):
Loss on debt redemptions	0		0		(103)		0
Investment income (loss)	(3)		38		(4)		50
Miscellaneous income	21		1		29		25
Capitalized interest	9		9		28		27
Total other income (expense)	(9)		(6)		(183)		(45)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	56		161		(62)		350
INCOME TAXES (BENEFITS)	23		65		(19)		139
NET INCOME FROM CONTINUING OPERATIONS	33		96		(43)		211
Discontinued operations (net of income taxes of $5, $3, $8 and $6, respectively) (Note 16)	7		5		14		11
NET INCOME (LOSS)	40		101		(29)		222
STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	40		101		(29)		222
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(5)		(5)		(16)		(2)
Amortized loss (gain) on derivative hedges	(1)		(2)		(3)		(6)
Change in unrealized gain on available-for-sale securities	5		(2)		2		11
Other comprehensive income (loss)	(1)		(9)		(17)		3
Income taxes (benefits) on other comprehensive income (loss)	(1)		(3)		(7)		1
Net other comprehensive income (loss)	0		(6)		(10)		2
COMPREHENSIVE INCOME (LOSS)	40		95		(39)		224
FES | Affiliates
REVENUES:
Electric sales	186		155		482		385
OPERATING EXPENSES:
Purchased power	132		131		401		381
OTHER INCOME (EXPENSE):
Interest expense	(1)		(3)		(7)		(7)
FES | Non-Affiliates
REVENUES:
Electric sales	1,455		1,358		4,066		4,035
OPERATING EXPENSES:
Purchased power	724		502		1,755		1,425
OTHER INCOME (EXPENSE):
Interest expense	$ (35)		$ (51)		$ (126)		$ (140)

[1] Includes excise tax collections of $117 million and $123 million in the three months ended September 30, 2013 and 2012, respectively, and $346 million and $351 million in the nine months ended September 30, 2013 and 2012, respectively.