CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
REVENUES:
Total revenues	[1]	$ 4,202	$ 3,765
OPERATING EXPENSES:
Fuel		161	149
Purchased power		1,429	1,088
Other operating expenses		1,460	1,034
Provision for depreciation		421	411
Deferral of regulatory assets, net		(457)	(10)
General taxes		360	339
Total operating expenses		3,374	3,011
OPERATING INCOME		828	754
OTHER INCOME (EXPENSE):
Miscellaneous income, net		48	36
Interest expense		(326)	(288)
Capitalized financing costs		54	38
Total other expense		(224)	(214)
INCOME BEFORE INCOME TAXES		604	540
INCOME TAXES		138	126
NET INCOME		466	414
Income attributable to noncontrolling interest		61	54
EARNINGS ATTRIBUTABLE TO FIRSTENERGY CORP.		405	360
COMPREHENSIVE INCOME ATTRIBUTABLE TO FIRSTENERGY CORP.		$ 405	$ 360
EARNINGS PER SHARE ATTRIBUTABLE TO FIRSTENERGY CORP. (Note 3.):
Basic (in dollars per share)		$ 0.70	$ 0.62
Diluted (in dollars per share)		$ 0.70	$ 0.62
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic (in shares)		578	577
Diluted (in shares)		580	578
Distribution services and retail generation
REVENUES:
Total revenues		$ 3,244	$ 3,081
Transmission
REVENUES:
Total revenues		628	586
Other
REVENUES:
Total revenues		$ 330	$ 98

[1] Includes excise and gross receipts tax collections of $133 million and $123 million during the three months ended March 31, 2026 and 2025, respectively.