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EARNINGS PER SHARE OF COMMON STOCK - Narrative (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
4.00%, $1,500 Million Notes Maturity 2026 | Promissory Notes | FE |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Debt instrument, conversation price (in dollars per share) | $ 46.81 |  |
Stock Options |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive securities excluded from computation of EPS (in shares) | 0 | 0 | 0

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