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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) $ in Thousands | Feb. 09, 2022 USD ($) | Jul. 21, 2021 USD ($) | Oct. 29, 2020 USD ($) review | Sep. 30, 2023 USD ($) | Mar. 11, 2022 director
--- | --- | --- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  |  | $ 818,000 |
Company posted collateral related to net liability positions |  |  |  | 89,000 |
Collateral received |  |  |  | $ 29,000 |
Goal to reduce in GHG emissions |  |  |  | 30.00% |
Litigation settlement, number of voluntary compliance reports | review |  |  | 2 |  |
Litigation settlement, amount awarded to other party, civil penalty |  |  | $ 3,860 |  |
United States v. Householder, et al. |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Number of board members not seeking re-election | director |  |  |  |  | 6
Number of board members on special committee | director |  |  |  |  | 3
Shareholder Derivative Lawsuit |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Amount awarded to other party | $ 36,000 |  |  |  |
Amount awarded from other party | $ 180,000 |  |  |  |
Regulation of Waste Disposal |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | $ 96,000 |
Environmental liabilities former gas facilities |  |  |  | 62,000 |
U.S. Attorney's Office | United States v. Householder, et al. |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Term of DPA |  | 3 years |  |  |
Loss in period |  | $ 230,000 |  |  |
Term of payments |  | 60 days |  |  |
United States Treasury | United States v. Householder, et al. |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Amount awarded to other party |  | $ 115,000 |  |  |
Ohio Development Service | United States v. Householder, et al. |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Amount awarded to other party |  | $ 115,000 |  |  |
FE |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  |  | 521,000 |
Other Assurances |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  |  | $ 297,000 |

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