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SEGMENT INFORMATION - Narrative (Details) customer in Millions, $ in Billions	9 Months Ended	12 Months Ended
	Sep. 30, 2024 site	Dec. 31, 2025 MW site	Dec. 31, 2024 USD ($) customer MW site	Jan. 01, 2024
Segment Reporting Information [Line Items]
Number of customers | customer			6.0
FEV | Global Holding
Segment Reporting Information [Line Items]
Investment ownership percentage			33.33%	33.33%
Distribution
Segment Reporting Information [Line Items]
Number of customers | customer			4.3
Plant generation capacity (in MW's)			3,604
Integrated
Segment Reporting Information [Line Items]
Number of customers | customer			2.0
Integrated | Solar Generation Project | MP and PE
Segment Reporting Information [Line Items]
Plant capacity (in MW's)			50
Number of approved solar sites | site			5
Number of completed solar sites | site	2
Integrated | Solar Generation Project | MP and PE | Forecast
Segment Reporting Information [Line Items]
Plant capacity (in MW's)		26
Public utilities, expected to be completed | site		3
Integrated | Solar Generation Project | MP and PE | West Virginia
Segment Reporting Information [Line Items]
Plant generation capacity (in MW's)			24
Other Business Operations | FE
Segment Reporting Information [Line Items]
Long-term debt and other long-term obligations | $			$ 6.1
Other Business Operations | OVEC
Segment Reporting Information [Line Items]
Plant generation capacity (in MW's)			67

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