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VARIABLE INTEREST ENTITIES - Narrative (Details) $ in Millions | Mar. 31, 2024 USD ($) subsidiary agreement | Dec. 31, 2023 USD ($) | Feb. 02, 2023 | Jun. 30, 2013 USD ($)
--- | --- | --- | --- | ---
Variable Interest Entities (Textuals) [Abstract] |  |  |  |
Assets | $ 51,299 | $ 48,767 |  |
Liabilities | $ 37,686 | 37,851 |  |
Number of subsidiaries that issued environmental control bonds | subsidiary | 2 |  |  |
Long-term pollution control bond | $ 203 | 218 |  |
Restricted cash | $ 27 | 42 |  |
Number of long-term purchase power agreements | agreement | 4 |  |  |
FET |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 49.90% |  |  |
Phase In Recovery Bonds |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |
Long-term debt and other long-term obligations | $ 183 | 191 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |
Assets | 11,131 | 10,984 |  |
Liabilities | $ 7,798 | 7,426 |  |
FE | FET |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |
Ownership percentage by parent | 50.10% |  |  |
Minority interest ownership percentage sold percentage |  |  | 0.30 |
FE | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |
Assets | $ 11,156 | 11,024 |  |
Liabilities | 8,184 | 7,835 |  |
Ohio Funding Companies | Phase In Recovery Bonds |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |
Face amount of debt |  |  |  | $ 445
MP, PE and the Ohio Companies |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |
Restricted cash | $ 25 | $ 40 |  |

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