SEGMENT INFORMATION - Narrative (Details) customer in Millions, $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2024 USD ($) MW	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) site customer MW	Sep. 30, 2023 USD ($)	Dec. 31, 2025 site MW
Segment Reporting Information [Line Items]
Number of customers | customer				6.0
Total revenues | $	[1]	$ 3,729	$ 3,487	$ 10,296	$ 9,724
FEV | Global Holding
Segment Reporting Information [Line Items]
Investment ownership percentage		33.30%		33.30%
Distribution Segment
Segment Reporting Information [Line Items]
Number of customers | customer				4.2
Distribution Segment | Rate Base 2023
Segment Reporting Information [Line Items]
Total revenues | $				$ 10,900
Other Business Operations | FE
Segment Reporting Information [Line Items]
Long-term debt and other long-term obligations | $		$ 6,100		$ 6,100
Other Business Operations | OVEC
Segment Reporting Information [Line Items]
Plant capacity (in MW's) | MW		67		67
Integrated
Segment Reporting Information [Line Items]
Number of customers | customer				2.0
Integrated | Rate Base 2023
Segment Reporting Information [Line Items]
Total revenues | $				$ 8,700
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
Integrated | MP and PE | Solar Generation Project | Forecast
Segment Reporting Information [Line Items]
Plant capacity (in MW's) | MW						26
Number of sites expected to be completed | site						3
Integrated | MP and PE | Solar Generation Project | West Virginia
Segment Reporting Information [Line Items]
Plant capacity (in MW's) | MW		24		24
Regulated Transmission | Rate Base 2023
Segment Reporting Information [Line Items]
Total revenues | $				$ 7,700
Integrated Segment
Segment Reporting Information [Line Items]
Plant capacity (in MW's) | MW		3,604		3,604

[1] Includes excise and gross receipts tax collections of $116 million and $114 million during the three months ended September 30, 2024 and 2023, respectively, and $329 million and $315 million during the nine months ended September 30, 2024 and 2023, respectively.