Consolidated Statements of Income (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
REVENUES:
Electric utilities	$ 10,396,000,000		$ 9,815,000,000		$ 11,139,000,000
Unregulated businesses	5,862,000,000		3,524,000,000		1,834,000,000
Excise and gross receipts tax collections	486,000,000		428,000,000		395,000,000
Total revenues	16,258,000,000	[1]	13,339,000,000	[1]	12,973,000,000	[1]
EXPENSES:
Fuel	2,317,000,000		1,432,000,000		1,153,000,000
Purchased power	4,986,000,000		4,624,000,000		4,730,000,000
Other operating expenses	3,909,000,000		2,696,000,000		2,551,000,000
Pension and other postretirement benefits mark-to-market	507,000,000		190,000,000		321,000,000
Provision for depreciation	1,121,000,000		768,000,000		757,000,000
Amortization of regulatory assets, net	329,000,000		722,000,000		1,019,000,000
General taxes	978,000,000		776,000,000		753,000,000
Impairment of long-lived assets	413,000,000		388,000,000		6,000,000
Total expenses	14,560,000,000		11,596,000,000		11,290,000,000
OPERATING INCOME	1,698,000,000		1,743,000,000		1,683,000,000
OTHER INCOME (EXPENSE):
Gain on partial sale of Signal Peak	569,000,000		0		0
Investment income	114,000,000		117,000,000		204,000,000
Interest expense	(1,008,000,000)		(845,000,000)		(978,000,000)
Capitalized interest	70,000,000		165,000,000		131,000,000
Total other expense	(255,000,000)		(563,000,000)		(643,000,000)
INCOME (LOSS) BEFORE INCOME TAXES	1,443,000,000		1,180,000,000		1,040,000,000
INCOME TAXES	574,000,000		462,000,000		184,000,000
NET INCOME (LOSS)	869,000,000		718,000,000		856,000,000
Income (loss) attributable to noncontrolling interest	(16,000,000)		(24,000,000)		(16,000,000)
EARNINGS AVAILABLE TO FIRSTENERGY CORP.	885,000,000		742,000,000		872,000,000
Basic earnings per share of common stock	$ 2.22		$ 2.44		$ 2.87
Weighted average number of basic shares outstanding	399	[2]	304	[2]	304	[2]
Diluted earnings per share of common stock	$ 2.21		$ 2.42		$ 2.85
Weighted average number of diluted shares outstanding	401	[2]	305	[2]	306	[2]
FES
REVENUES:
Other	223,000,000		349,000,000		455,000,000
Total revenues	5,477,000,000		5,828,000,000		4,728,000,000
EXPENSES:
Fuel	1,344,000,000		1,403,000,000		1,129,000,000
Other operating expenses	1,630,000,000		1,230,000,000		1,143,000,000
Pension and other postretirement benefits mark-to-market	171,000,000		107,000,000		150,000,000
Provision for depreciation	275,000,000		246,000,000		262,000,000
General taxes	124,000,000		94,000,000		87,000,000
Impairment of long-lived assets	294,000,000		388,000,000		6,000,000
Total expenses	5,458,000,000		5,424,000,000		3,995,000,000
OPERATING INCOME	19,000,000		404,000,000		733,000,000
OTHER INCOME (EXPENSE):
Investment income	57,000,000		59,000,000		125,000,000
Miscellaneous income (expense)	30,000,000		17,000,000		13,000,000
Interest expense	(211,000,000)		(216,000,000)		(152,000,000)
Capitalized interest	35,000,000		92,000,000		60,000,000
Total other expense	(89,000,000)		(48,000,000)		46,000,000
INCOME (LOSS) BEFORE INCOME TAXES	(70,000,000)		356,000,000		779,000,000
INCOME TAXES	(11,000,000)		125,000,000		281,000,000
NET INCOME (LOSS)	(59,000,000)		231,000,000		498,000,000
FES | Affiliates
REVENUES:
Electric utilities	752,000,000		2,227,000,000		2,826,000,000
EXPENSES:
Purchased power	242,000,000		371,000,000		222,000,000
OTHER INCOME (EXPENSE):
Interest expense	(8,000,000)		(10,000,000)		(10,000,000)
FES | Non-Affiliates
REVENUES:
Electric utilities	4,502,000,000		3,252,000,000		1,447,000,000
EXPENSES:
Purchased power	1,378,000,000		1,585,000,000		996,000,000
OTHER INCOME (EXPENSE):
Interest expense	(203,000,000)		(206,000,000)		(142,000,000)
OE
REVENUES:
Electric utilities	1,526,000,000		1,729,000,000		2,418,000,000
Excise and gross receipts tax collections	107,000,000		107,000,000		99,000,000
Total revenues	1,633,000,000		1,836,000,000		2,517,000,000
EXPENSES:
Other operating expenses	451,000,000		342,000,000		439,000,000
Pension and other postretirement benefits mark-to-market	43,000,000		24,000,000		26,000,000
Provision for depreciation	93,000,000		91,000,000		92,000,000
Amortization of regulatory assets, net	30,000,000		63,000,000		94,000,000
General taxes	190,000,000		183,000,000		171,000,000
Total expenses	1,366,000,000		1,541,000,000		2,296,000,000
OPERATING INCOME	267,000,000		295,000,000		221,000,000
OTHER INCOME (EXPENSE):
Investment income	23,000,000		22,000,000		47,000,000
Miscellaneous income (expense)	2,000,000		4,000,000		3,000,000
Interest expense	(88,000,000)		(89,000,000)		(91,000,000)
Capitalized interest	2,000,000		1,000,000		1,000,000
Total other expense	(61,000,000)		(62,000,000)		(40,000,000)
INCOME (LOSS) BEFORE INCOME TAXES	206,000,000		233,000,000		181,000,000
INCOME TAXES	78,000,000		78,000,000		62,000,000
NET INCOME (LOSS)	128,000,000		155,000,000		119,000,000
OE | Affiliates
EXPENSES:
Purchased power	287,000,000		522,000,000		993,000,000
OE | Non-Affiliates
EXPENSES:
Purchased power	272,000,000		316,000,000		481,000,000
CEI
REVENUES:
Electric utilities	808,778,000		1,152,950,000		1,609,946,000
Excise and gross receipts tax collections	68,009,000		68,422,000		66,192,000
Total revenues	876,787,000		1,221,372,000		1,676,138,000
EXPENSES:
Other operating expenses	129,716,000		115,066,000		148,567,000
Pension and other postretirement benefits mark-to-market	20,069,000		11,945,000		38,329,000
Provision for depreciation	76,135,000		74,907,000		73,883,000
Amortization of regulatory assets, net	52,846,000		169,541,000		236,380,000
General taxes	154,487,000		143,294,000		145,324,000
Total expenses	669,525,000		1,005,124,000		1,622,884,000
OPERATING INCOME	207,262,000		216,248,000		53,254,000
OTHER INCOME (EXPENSE):
Investment income	23,565,000		27,360,000		31,194,000
Miscellaneous income (expense)	3,959,000		2,362,000		3,911,000
Interest expense	(129,679,000)		(133,351,000)		(137,171,000)
Capitalized interest	608,000		63,000		261,000
Total other expense	(101,547,000)		(103,566,000)		(101,805,000)
INCOME (LOSS) BEFORE INCOME TAXES	105,715,000		112,682,000		(48,551,000)
INCOME TAXES	33,852,000		35,127,000		(19,794,000)
NET INCOME (LOSS)	71,863,000		77,555,000		(28,757,000)
Income (loss) attributable to noncontrolling interest	1,293,000		1,517,000		1,714,000
EARNINGS AVAILABLE TO FIRSTENERGY CORP.	70,570,000		76,038,000		(30,471,000)
CEI | Affiliates
EXPENSES:
Purchased power	143,030,000		361,317,000		734,592,000
CEI | Non-Affiliates
EXPENSES:
Purchased power	93,242,000		129,054,000		245,809,000
TE
REVENUES:
Electric utilities	448,988,000		489,310,000		810,069,000
Excise and gross receipts tax collections	27,983,000		27,387,000		23,839,000
Total revenues	476,971,000		516,697,000		833,908,000
EXPENSES:
Other operating expenses	133,366,000		101,895,000		135,938,000
Pension and other postretirement benefits mark-to-market	10,560,000		4,183,000		14,360,000
Provision for depreciation	32,467,000		32,161,000		31,181,000
Amortization of regulatory assets, net	(1,679,000)		(1,427,000)		37,820,000
General taxes	53,911,000		52,045,000		47,815,000
Total expenses	396,998,000		433,554,000		796,149,000
OPERATING INCOME	79,973,000		83,143,000		37,759,000
OTHER INCOME (EXPENSE):
Investment income	11,054,000		14,727,000		24,388,000
Miscellaneous income (expense)	(366,000)		(4,287,000)		(2,169,000)
Interest expense	(41,876,000)		(41,883,000)		(36,512,000)
Capitalized interest	547,000		304,000		283,000
Total other expense	(30,641,000)		(31,139,000)		(14,010,000)
INCOME (LOSS) BEFORE INCOME TAXES	49,332,000		52,004,000		23,749,000
INCOME TAXES	14,605,000		15,756,000		5,347,000
NET INCOME (LOSS)	34,727,000		36,248,000		18,402,000
Income (loss) attributable to noncontrolling interest	7,000		4,000		21,000
EARNINGS AVAILABLE TO FIRSTENERGY CORP.	34,720,000		36,244,000		18,381,000
TE | Affiliates
EXPENSES:
Purchased power	94,351,000		180,523,000		392,825,000
TE | Non-Affiliates
EXPENSES:
Purchased power	74,022,000		64,174,000		136,210,000
JCP&L
REVENUES:
Electric utilities	2,445,000,000		2,976,000,000		2,944,000,000
Excise and gross receipts tax collections	50,000,000		51,000,000		49,000,000
Total revenues	2,495,000,000		3,027,000,000		2,993,000,000
EXPENSES:
Purchased power	1,382,000,000		1,736,000,000		1,783,000,000
Other operating expenses	371,000,000		323,000,000		284,000,000
Pension and other postretirement benefits mark-to-market	60,000,000		26,000,000		37,000,000
Provision for depreciation	135,000,000		113,000,000		108,000,000
Amortization of regulatory assets, net	108,000,000		321,000,000		344,000,000
General taxes	67,000,000		65,000,000		63,000,000
Total expenses	2,123,000,000		2,584,000,000		2,619,000,000
OPERATING INCOME	372,000,000		443,000,000		374,000,000
OTHER INCOME (EXPENSE):
Miscellaneous income (expense)	11,000,000		6,000,000		5,000,000
Interest expense	(124,000,000)		(120,000,000)		(117,000,000)
Capitalized interest	2,000,000		1,000,000		1,000,000
Total other expense	(111,000,000)		(113,000,000)		(111,000,000)
INCOME (LOSS) BEFORE INCOME TAXES	261,000,000		330,000,000		263,000,000
INCOME TAXES	117,000,000		147,000,000		105,000,000
NET INCOME (LOSS)	144,000,000		183,000,000		158,000,000
Met-Ed
REVENUES:
Electric utilities	1,149,030,000		1,733,651,000		1,611,088,000
Excise and gross receipts tax collections	63,511,000		84,896,000		77,894,000
Total revenues	1,212,541,000		1,818,547,000		1,688,982,000
EXPENSES:
Other operating expenses	171,236,000		401,016,000		259,135,000
Pension and other postretirement benefits mark-to-market	33,493,000		6,993,000		16,044,000
Provision for depreciation	60,831,000		55,792,000		54,652,000
Amortization of regulatory assets, net	92,450,000		160,360,000		244,709,000
General taxes	74,364,000		87,829,000		87,799,000
Total expenses	1,059,360,000		1,667,474,000		1,563,884,000
OPERATING INCOME	153,181,000		151,073,000		125,098,000
OTHER INCOME (EXPENSE):
Interest income	121,000		3,019,000		9,709,000
Miscellaneous income (expense)	3,606,000		5,901,000		4,107,000
Interest expense	(52,685,000)		(52,829,000)		(56,683,000)
Capitalized interest	486,000		653,000		181,000
Total other expense	(48,472,000)		(43,256,000)		(42,686,000)
INCOME (LOSS) BEFORE INCOME TAXES	104,709,000		107,817,000		82,412,000
INCOME TAXES	36,820,000		47,733,000		28,875,000
NET INCOME (LOSS)	67,889,000		60,084,000		53,537,000
Met-Ed | Affiliates
EXPENSES:
Purchased power	142,858,000		612,496,000		365,491,000
Met-Ed | Non-Affiliates
EXPENSES:
Purchased power	484,128,000		342,988,000		536,054,000
Penelec
REVENUES:
Electric utilities	1,026,342,000		1,471,956,000		1,385,574,000
Excise and gross receipts tax collections	54,852,000		67,915,000		63,372,000
Total revenues	1,081,194,000		1,539,871,000		1,448,946,000
EXPENSES:
Other operating expenses	148,298,000		246,966,000		192,761,000
Pension and other postretirement benefits mark-to-market	41,127,000		8,279,000		33,983,000
Provision for depreciation	63,071,000		65,694,000		65,637,000
Amortization of regulatory assets, net	62,730,000		(34,819,000)		56,572,000
General taxes	66,001,000		73,285,000		73,839,000
Total expenses	921,689,000		1,367,204,000		1,308,927,000
OPERATING INCOME	159,505,000		172,667,000		140,019,000
OTHER INCOME (EXPENSE):
Miscellaneous income (expense)	2,754,000		5,957,000		3,662,000
Interest expense	(69,302,000)		(69,864,000)		(54,605,000)
Capitalized interest	214,000		770,000		230,000
Total other expense	(66,334,000)		(63,137,000)		(50,713,000)
INCOME (LOSS) BEFORE INCOME TAXES	93,171,000		109,530,000		89,306,000
INCOME TAXES	30,098,000		46,340,000		38,508,000
NET INCOME (LOSS)	63,073,000		63,190,000		50,798,000
Penelec | Affiliates
EXPENSES:
Purchased power	208,183,000		643,152,000		341,645,000
Penelec | Non-Affiliates
EXPENSES:
Purchased power	332,279,000		364,647,000		544,490,000
Retained Earnings
OTHER INCOME (EXPENSE):
EARNINGS AVAILABLE TO FIRSTENERGY CORP.			742,000,000		872,000,000
Retained Earnings | FES
OTHER INCOME (EXPENSE):
NET INCOME (LOSS)	(59,000,000)		231,000,000		498,000,000
Retained Earnings | OE
OTHER INCOME (EXPENSE):
NET INCOME (LOSS)	128,000,000		155,000,000		119,000,000
Retained Earnings | CEI
OTHER INCOME (EXPENSE):
EARNINGS AVAILABLE TO FIRSTENERGY CORP.	70,570,000		76,038,000		(30,471,000)
Retained Earnings | TE
OTHER INCOME (EXPENSE):
EARNINGS AVAILABLE TO FIRSTENERGY CORP.	34,720,000		36,244,000		18,381,000
Retained Earnings | JCP&L
OTHER INCOME (EXPENSE):
NET INCOME (LOSS)	144,000,000		183,000,000		158,000,000
Retained Earnings | Met-Ed
OTHER INCOME (EXPENSE):
NET INCOME (LOSS)	67,889,000		60,084,000		53,537,000
Retained Earnings | Penelec
OTHER INCOME (EXPENSE):
NET INCOME (LOSS)	$ 63,073,000		$ 63,190,000		$ 50,798,000

[1] Includes $486 million, $428 million and $395 million of excise tax collections in 2011, 2010 and 2009, respectively.

[2] Includes 113 million shares issued to AE shareholders for the periods subsequent to the merger date (see Note 2, Merger).