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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Apr. 16, 2025 | Dec. 31, 2024 | Dec. 05, 2024
Fair Value of Financial Instruments [Line Items] |  |  |  |  |
Investments not required to be disclosed | $ 374 |  |  | $ 370 |
Senior Notes | TrAIL | Subsequent Event | 5.00%, $600 Million Senior Notes |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |
Face amount of debt |  |  | $ 600 |  |
Issuance interest rate |  |  | 5.00% |  |
Senior Notes | JERSEY CENTRAL POWER & LIGHT COMPANY | Unsecured Senior Notes Due 2035 |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |
Face amount of debt |  |  |  |  | $ 700
Corporate-Owned Life Insurance |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |
Gain on investments | $ 2 | $ 9 |  |  |

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