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SEGMENT INFORMATION - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) customer meter MW | Mar. 31, 2023 USD ($) | Dec. 31, 2025 site MW | Jan. 08, 2024 MW
Segment Reporting Information [Line Items] |  |  |  |  |
Number of customers served by utility operating companies | customer |  | 6,000,000 |  |  |
Total revenues | $ | [1] | $ 3,287 | $ 3,231 |  |
FEV | Global Holding |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment ownership percentage |  | 33.30% |  |  |
Distribution |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of customers served by utility operating companies | customer |  | 4,200,000 |  |  |
Megawatts of net demonstrated capacity of competitive segment | MW |  | 3,599 |  |  |
Distribution | Rate Base 2023 |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ |  | $ 10,900 |  |  |
Integrated |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of customers served by utility operating companies | customer |  | 2,000,000 |  |  |
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 | meter |  | 5 |  |  |
Integrated | MP and PE | Solar Generation Project | Forecast |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  | 31 |
Number of sites expected to be completed | site |  |  |  | 4 |
Integrated | MP and PE | Solar Generation Project | West Virginia |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Megawatts of net demonstrated capacity of competitive segment | MW |  |  |  |  | 19
Regulated Transmission | Rate Base 2023 |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ |  | $ 7,700 |  |  |
Other/Corporate | OVEC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Megawatts of net demonstrated capacity of competitive segment | MW |  | 67 |  |  |
Other/Corporate | FE |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Long-term debt and other long-term obligations | $ |  | $ 6,500 |  |  |
[1] | Includes excise and gross receipts tax collections of $115 million and $109 million during the three months ended March 31, 2024 and 2023, respectively.

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