Consolidated Statements of Income and Comprehensive Income (FirstEnergy Solutions Corp.) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUES:
Electric sales	$ 5,666	$ 5,747	$ 3,519
Total revenues	9,637	10,400	9,820
OPERATING EXPENSES:
Fuel	2,471	2,317	1,432
Purchased power	4,237	4,875	4,624
Other operating expenses	3,769	3,964	2,714
Pensions and OPEB mark-to-market adjustment	609	507	190
Provision for depreciation	1,124	1,066	750
General taxes	985	978	776
Total operating expenses	13,127	14,449	11,596
OPERATING INCOME (LOSS)	2,176	1,698	1,743
OTHER INCOME (EXPENSE):
Investment income	77	114	117
Interest expense	(1,001)	(1,008)	(845)
Capitalized interest	72	70	165
Total other income (expense)	(852)	(255)	(563)
INCOME BEFORE INCOME TAXES	1,324	1,443	1,180
INCOME TAXES (BENEFITS)	553	574	462
NET INCOME	771	869	718
STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	771	869	718
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(115)	(90)	(220)
Amortized gain (loss) on derivative hedges	1	23	36
Change in unrealized gain on available-for-sale securities	(6)	19	8
Other comprehensive income (loss)	(120)	(48)	(176)
Income taxes (benefits) on other comprehensive income (loss)	(79)	(49)	(74)
Other comprehensive income (loss), net of tax	(41)	1	(102)
COMPREHENSIVE INCOME	730	870	616
FES
REVENUES:
Other	246	223	349
Total revenues	5,918	5,477	5,828
OPERATING EXPENSES:
Fuel	1,287	1,344	1,403
Other operating expenses	1,360	1,630	1,230
Pensions and OPEB mark-to-market adjustment	166	171	107
Provision for depreciation	276	275	246
General taxes	136	124	94
Impairment of long-lived assets	0	294	388
Total operating expenses	5,557	5,458	5,424
OPERATING INCOME (LOSS)	361	19	404
OTHER INCOME (EXPENSE):
Investment income	66	57	59
Miscellaneous income	35	30	17
Capitalized interest	37	35	92
Total other income (expense)	(63)	(89)	(48)
INCOME BEFORE INCOME TAXES	298	(70)	356
INCOME TAXES (BENEFITS)	111	(11)	125
NET INCOME	187	(59)	231
STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	187	(59)	231
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	6	(12)	(30)
Amortized gain (loss) on derivative hedges	(9)	12	23
Change in unrealized gain on available-for-sale securities	(5)	16	8
Other comprehensive income (loss)	(8)	16	1
Income taxes (benefits) on other comprehensive income (loss)	(4)	2	4
Other comprehensive income (loss), net of tax	(4)	14	(3)
COMPREHENSIVE INCOME	183	(45)	228
FES | Affiliates
REVENUES:
Electric sales	515	752	2,227
OPERATING EXPENSES:
Purchased power	451	242	371
OTHER INCOME (EXPENSE):
Interest expense	(10)	(8)	(10)
FES | Non-Affiliates
REVENUES:
Electric sales	5,157	4,502	3,252
OPERATING EXPENSES:
Purchased power	1,881	1,378	1,585
OTHER INCOME (EXPENSE):
Interest expense	$ (191)	$ (203)	$ (206)