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VARIABLE INTEREST ENTITIES - Narrative (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) subsidiary agreement | Feb. 02, 2023 | Dec. 31, 2022 USD ($) | Jun. 30, 2013 USD ($)
Business Acquisition [Line Items] |  |  |  |
Assets | $ 48,767 |  | $ 46,108 |
TOTAL LIABILITIES | $ 37,851 |  | 35,465 |
Number of subsidiaries that issued environmental control bonds | subsidiary | 2 |  |  |
Environmental control bonds outstanding | $ 218 |  | 247 |
Restricted cash | $ 42 |  | 46 |
Power Purchase Agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of long term power purchase agreements maintained by parent company with non utility generation entities | agreement | 4 |  |  |
Power Purchase Agreements | Global Holding And PATH WV |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Equity method investment, ownership percentage | 0.00% |  |  |
FET |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Noncontrolling interest ownership percentage | 19.90% | 49.90% |  |
FE | FET |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage by parent | 80.10% | 50.10% |  |
Minority interest ownership percentage sold percentage |  | 0.30 |  |
MP, PE and the Ohio Companies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Restricted cash | $ 40 |  | 41 |
Phase In Recovery Bonds |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Long-term debt and other long-term obligations | 191 |  | 206 |
Phase In Recovery Bonds | Ohio Funding Companies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Face amount of loan |  |  |  | $ 445
Variable Interest Entity, Primary Beneficiary |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets | 10,984 |  | 10,063 |
TOTAL LIABILITIES | 7,426 |  | 7,120 |
Variable Interest Entity, Primary Beneficiary | FE |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets | 11,024 |  | 10,104 |
TOTAL LIABILITIES | $ 7,835 |  | $ 7,573 |

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