v3.25.3

Cover Page	9 Months Ended
Cover Page	Sep. 30, 2025 shares
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2025
Document Transition Report	false
Entity File Number	333-21011
Entity Registrant Name	FIRSTENERGY CORP.
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	34-1843785
Entity Address, Address Line One	341 White Pond Drive
Entity Address, City or Town	Akron
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44320
City Area Code	(800)
Local Phone Number	736-3402
Title of 12(b) Security	Common Stock, $0.10 par value
Trading Symbol	FE
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding	577,665,555
Entity Central Index Key	0001031296
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
Amendment Flag	false
JERSEY CENTRAL POWER & LIGHT COMPANY
Document Information [Line Items]
Entity File Number	1-3141
Entity Registrant Name	JERSEY CENTRAL POWER & LIGHT COMPANY
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	21-0485010
Entity Address, Address Line One	300 Madison Avenue
Entity Address, City or Town	Morristown
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07962
City Area Code	(800)
Local Phone Number	736-3402
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Common Stock Shares Outstanding	13,628,447

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FIRSTENERGY CORP 10-Q