Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
REVENUES:
Total revenues	[1]	$ 12,870	$ 12,459	$ 11,132
OPERATING EXPENSES:
Fuel		538	730	481
Purchased power		4,108	3,863	2,964
Other operating expenses		3,594	3,817	3,196
Provision for depreciation		1,461	1,375	1,302
Amortization (deferral) of regulatory assets, net		(261)	(365)	269
General taxes		1,164	1,129	1,073
DPA penalty (Note 14)		0	0	230
Gain on sale of Yards Creek		0	0	(109)
Total operating expenses		10,604	10,549	9,406
OPERATING INCOME		2,266	1,910	1,726
OTHER INCOME (EXPENSE):
Debt redemption costs (Note 11)		(36)	(171)	(2)
Equity method investment earnings (Note 1)		175	168	31
Miscellaneous income, net		164	415	486
Pension and OPEB mark-to-market adjustment		(78)	72	382
Interest expense		(1,124)	(1,039)	(1,139)
Capitalized financing costs		97	84	75
Total other expense		(802)	(471)	(167)
INCOME BEFORE INCOME TAXES		1,464	1,439	1,559
INCOME TAXES		267	1,000	320
INCOME FROM CONTINUING OPERATIONS		1,197	439	1,239
Discontinued operations (Note 15)	[2]	(21)	0	44
NET INCOME		1,176	439	1,283
Income attributable to noncontrolling interest (continuing operations)		74	33	0
EARNINGS ATTRIBUTABLE TO FIRSTENERGY CORP.		1,102	406	1,283
AMOUNTS ATTRIBUTABLE TO FIRSTENERGY CORP.
Earnings from continuing operations		1,123	406	1,239
Earnings from discontinued operations	[2]	(21)	0	44
EARNINGS ATTRIBUTABLE TO FIRSTENERGY CORP.		$ 1,102	$ 406	$ 1,283
EARNINGS PER SHARE ATTRIBUTABLE TO FIRSTENERGY CORP. (Note 3)
Basic - continuing operations (in dollars per share)		$ 1.96	$ 0.71	$ 2.27
Basic - discontinued operations (in dollars per share)		(0.04)	0	0.08
Basic (in dollars per share)		1.92	0.71	2.35
Diluted - continuing operations (in dollars per share)		1.96	0.71	2.27
Diluted - discontinued operations (in dollars per share)		(0.04)	0	0.08
Diluted (in dollars per share)		$ 1.92	$ 0.71	$ 2.35
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic (in shares)		573	571	545
Diluted (in shares)		574	572	546
Distribution services and retail generation
REVENUES:
Total revenues		$ 10,405	$ 9,916	$ 9,009
Transmission
REVENUES:
Total revenues		2,049	1,863	1,608
Other
REVENUES:
Total revenues		$ 416	$ 680	$ 515

[1] Includes excise and gross receipts tax collections of $420 million, $406 million and $374 million in 2023, 2022 and 2021, respectively.

[2] Net of income tax benefit (expense) of ($21 million) and $48 million in 2023 and 2021, respectively.