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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Apr. 18, 2024 | Apr. 15, 2024 | Apr. 01, 2024 | Dec. 31, 2023
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |
Investments not required to be disclosed | $ 408 |  |  |  |  | $ 382
4.70% $500 Million Unsecured Notes | Subsequent Event | Senior Notes | JCP&L |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 500 |
Issuance interest rate |  |  |  |  | 4.70% |
7.375%, 715 Million Notes due 2031 | Senior Notes |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |
Face amount of debt | $ 463 |  |  |  |  |
Issuance interest rate | 7.375% |  |  |  |  |
Make-whole premium | $ 80 |  |  |  |  |
4.10% $400 Million First Mortgage Bond | Subsequent Event | Senior Notes | JCP&L |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |
Face amount of debt |  |  |  | $ 400 |  |
Issuance interest rate |  |  |  | 4.10% |  |
5.94% $250 Million Unsecured Notes | Subsequent Event | Senior Notes | MAIT |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |
Face amount of debt |  |  | $ 250 |  |  |
Issuance interest rate |  |  | 5.94% |  |  |
Corporate-Owned Life Insurance |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |
Gain (loss) on investments | $ 9 | $ 7 |  |  |  |

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