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SEGMENT INFORMATION - Narrative (Details) customer in Millions, $ in Millions		9 Months Ended	12 Months Ended
	Jul. 16, 2025 USD ($)	Sep. 30, 2025 USD ($) customer site MW	Dec. 31, 2025 site MW	Dec. 31, 2024 USD ($) site MW	Jul. 31, 2025
Segment Reporting Information [Line Items]
Number of customers | customer		6.0
Global Holding
Segment Reporting Information [Line Items]
Equity method investments | $				$ 45.0
FEV | Global Holding
Segment Reporting Information [Line Items]
Investment ownership percentage	33.33%				33.33%
Ownership percentage sold	0.3333
Equity method investments | $		$ 47.5
Proceeds from investments sold | $	$ 47.5
JERSEY CENTRAL POWER & LIGHT COMPANY
Segment Reporting Information [Line Items]
Number of customers | customer		1.2
Distribution Segment
Segment Reporting Information [Line Items]
Number of customers | customer		4.3
Distribution Segment | JERSEY CENTRAL POWER & LIGHT COMPANY
Segment Reporting Information [Line Items]
Number of customers | customer		1.2
Integrated Segment
Segment Reporting Information [Line Items]
Number of customers | customer		2.0
Plant capacity (in MW's) | MW		3,610
Other Business Operations | FE
Segment Reporting Information [Line Items]
Long-term debt | $		$ 7,100.0
Other Business Operations | OVEC
Segment Reporting Information [Line Items]
Plant capacity (in MW's) | MW		67
Integrated | MP and PE | Solar Generation Project
Segment Reporting Information [Line Items]
Plant capacity (in MW's) | MW		50
Number of approved solar sites | site		5
Number of completed solar sites | site		3		3
Integrated | MP and PE | Solar Generation Project | Forecast
Segment Reporting Information [Line Items]
Plant capacity (in MW's) | MW			20
Number of sites expected to be completed | site			2
Integrated | MP and PE | Solar Generation Project | West Virginia
Segment Reporting Information [Line Items]
Plant capacity (in MW's) | MW				30

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