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VARIABLE INTEREST ENTITIES - Narrative (Details) $ in Millions | Sep. 30, 2025 USD ($) subsidiary agreement | Jul. 31, 2025 | Jul. 16, 2025 | Dec. 31, 2024 USD ($) | Jun. 30, 2013 USD ($)
--- | --- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |
Assets | $ 55,884 |  |  | $ 52,044 |
Liabilities | $ 41,700 |  |  | 38,324 |
Number of subsidiaries that issued environmental control bonds | subsidiary | 2 |  |  |  |
Long-term pollution control bond | $ 156 |  |  | 188 |
Restricted cash | $ 27 |  |  | 43 |
Number of long-term purchase power agreements | agreement | 6 |  |  |  |
FET |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 49.90% |  |  |  |
Phase In Recovery Bonds |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Long-term debt | $ 159 |  |  | 175 |
FE | FET |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Ownership percentage by parent | 50.10% |  |  |  |
Ohio Funding Companies | Phase In Recovery Bonds |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Face amount of debt |  |  |  |  | $ 445
MP, PE and the Ohio Companies |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Restricted cash | $ 25 |  |  | 40 |
JERSEY CENTRAL POWER & LIGHT COMPANY |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Assets | 11,490 |  |  | 9,927 |
Liabilities | $ 6,394 |  |  | 4,950 |
Number of long-term purchase power agreements | agreement | 1 |  |  |  |
FEV | Global Holding |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment ownership percentage |  | 33.33% | 33.33% |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Assets | $ 12,822 |  |  | 11,936 |
Liabilities | 9,379 |  |  | 8,706 |
Variable Interest Entity, Primary Beneficiary | FE |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Assets | 12,800 |  |  | 12,000 |
Liabilities | $ 9,700 |  |  | $ 9,100 |

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