Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
REVENUES:
Total revenues	[1]	$ 12,459	$ 11,132	$ 10,790
OPERATING EXPENSES:
Fuel		730	481	369
Purchased power		3,863	2,964	2,701
Other operating expenses		3,817	3,196	3,291
Provision for depreciation		1,375	1,302	1,274
Amortization (deferral) of regulatory assets, net		(365)	269	(53)
General taxes		1,129	1,073	1,046
DPA penalty (Note 13)		0	230	0
Gain on sale of Yards Creek (Note 14)		0	(109)	0
Total operating expenses		10,549	9,406	8,628
OPERATING INCOME		1,910	1,726	2,162
OTHER INCOME (EXPENSE):
Debt redemption costs (Note 10)		(171)	(2)	0
Equity method investment earnings (Note 1)		168	31	2
Miscellaneous income, net		415	486	430
Pension and OPEB mark-to-market adjustment		72	382	(477)
Interest expense		(1,039)	(1,139)	(1,065)
Capitalized financing costs		84	75	77
Total other expense		(471)	(167)	(1,033)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		1,439	1,559	1,129
INCOME TAXES		1,000	320	126
INCOME FROM CONTINUING OPERATIONS		439
Discontinued operations (Note 15)	[2]	0	44	76
NET INCOME		439	1,283	1,079
Income attributable to noncontrolling interest (continuing operations)		33	0	0
EARNINGS ATTRIBUTABLE TO FIRSTENERGY CORP.		$ 406	$ 1,283	$ 1,079
EARNINGS PER SHARE ATTRIBUTABLE TO FIRSTENERGY CORP.
Basic - Income from continuing operations, basic (in dollars per share)		$ 0.71	$ 2.27	$ 1.85
Basic - Discontinued operations, basic (in dollars per share)		0	0.08	0.14
Basic - EPS (in dollars per share)		0.71	2.35	1.99
Diluted - Income from continuing operations, diluted (in dollars per share)		0.71	2.27	1.85
Diluted - Discontinued operations, diluted (in dollars per share)		0	0.08	0.14
Diluted - EPS (in dollars per share)		$ 0.71	$ 2.35	$ 1.99
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Weighted average number of basic shares outstanding (in shares)		571	545	542
Weighted average number of diluted shares outstanding (in shares)		572	546	543
Distribution services and retail generation
REVENUES:
Total revenues		$ 9,916	$ 9,009	$ 8,688
Transmission
REVENUES:
Total revenues		1,863	1,608	1,613
Other
REVENUES:
Total revenues		$ 680	$ 515	$ 489

[1] Includes excise and gross receipts tax collections of $406 million, $374 million and $362 million in 2022, 2021 and 2020, respectively.

[2] Net of income tax benefit of $48 million and $59 million in 2021 and 2020, respectively.