Consolidated Statements of Income (FirstEnergy Corp.) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
REVENUES:
Electric utilities	$ 3,483	$ 3,888	$ 3,496	$ 4,182	$ 3,633	$ 4,032	$ 3,507	$ 3,720	$ 9,871		$ 9,451		$ 9,782
Unregulated businesses									5,178		5,441		5,473
Total revenues									15,049	[1]	14,892	[1]	15,255	[1]
OPERATING EXPENSES:
Fuel									2,280		2,496		2,471
Purchased power									4,716		3,963		4,246
Other operating expenses	901	858	1,021	1,182	948	877	886	882	3,962		3,593		3,760
Pension and OPEB mark-to-market adjustment	835	0	0	0	(256)	0	0	0	835		(256)		609
Provision for depreciation	316	308	302	294	293	316	300	293	1,220		1,202		1,119
Amortization (deferral) of regulatory assets, net									12		539		(68)
General taxes									962		978		984
Impairment of long-lived assets	0	0	0	0	322	0	473	0	0		795		0
Total operating expenses									13,987		13,310		13,121
OPERATING INCOME (LOSS)	(337)	716	292	391	387	508	42	645	1,062		1,582		2,134
OTHER INCOME (EXPENSE):
Loss on debt redemptions									(8)		(132)		0
Investment income									72		33		77
Interest expense									(1,073)		(1,016)		(1,001)
Capitalized financing costs									118		103		90
Total other expense									(891)		(1,012)		(834)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									171		570		1,300
INCOME TAXES	(268)	152	26	48	66	77	(62)	114	(42)		195		545
INCOME FROM CONTINUING OPERATIONS	(306)	333	64	122	142	209	(168)	192	213		375		755
Discontinued operations (net of income taxes of $69, $9 and $8, respectively) (Note 19)	0	0	0	86	0	9	4	4	86		17		16
NET INCOME (LOSS)	(306)	333	64	208	142	218	(164)	196	299		392		771
Income attributable to noncontrolling interest									0		0		1
EARNINGS AVAILABLE TO FIRSTENERGY CORP.									$ 299		$ 392		$ 770
EARNINGS PER SHARE OF COMMON STOCK:
Basic - Continuing Operations, in dollars per share	$ (0.73)	$ 0.79	$ 0.16	$ 0.29	$ 0.34	$ 0.50	$ (0.40)	$ 0.46	$ 0.51		$ 0.90		$ 1.81
Basic - Discontinued Operations, in dollars per share	$ 0.00	$ 0.00	$ 0.00	$ 0.21	$ 0.00	$ 0.02	$ 0.01	$ 0.01	$ 0.20		$ 0.04		$ 0.04
Basic - Earnings Available to FirstEnergy Corp., in dollars per share	$ (0.73)	$ 0.79	$ 0.16	$ 0.50	$ 0.34	$ 0.52	$ (0.39)	$ 0.47	$ 0.71		$ 0.94		$ 1.85
Diluted - Continuing Operations, in dollars per share	$ (0.73)	$ 0.79	$ 0.15	$ 0.29	$ 0.34	$ 0.50	$ (0.40)	$ 0.46	$ 0.51		$ 0.90		$ 1.80
Diluted - Discontinued Operations, in dollars per share	$ 0.00	$ 0.00	$ 0.00	$ 0.20	$ 0.00	$ 0.02	$ 0.01	$ 0.01	$ 0.20		$ 0.04		$ 0.04
Diluted - Earnings Available to FirstEnergy Corp., in dollars per share	$ (0.73)	$ 0.79	$ 0.15	$ 0.49	$ 0.34	$ 0.52	$ (0.39)	$ 0.47	$ 0.71		$ 0.94		$ 1.84
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING:
Basic, in shares									420		418		418
Diluted, in shares									421		419		419
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK, in dollars per share									$ 1.44		$ 1.65		$ 2.20

[1] Includes excise tax collections of $420 million, $458 million and $484 million in 2014, 2013 and 2012, respectively.