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SEGMENT INFORMATION - Narrative (Details) mi² in Thousands, customer in Millions, $ in Billions | 3 Months Ended
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Mar. 31, 2023 USD ($) mi² customer company MW
FEV | Global Holding |
Segment Reporting Information [Line Items] |
Investment ownership percentage | 33.30%
Regulated Distribution |
Segment Reporting Information [Line Items] |
Number of existing utility operating companies | company | 10
Number of customers served by utility operating companies | customer | 6
Number of square miles in service area | mi² | 65
Megawatts of net demonstrated capacity of competitive segment | 3,580
Other/Corporate | OVEC |
Segment Reporting Information [Line Items] |
Megawatts of net demonstrated capacity of competitive segment | 67
Other/Corporate | FirstEnergy |
Segment Reporting Information [Line Items] |
Long-term debt and other long-term obligations | $ | $ 5.7

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