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EMPLOYEE BENEFITS - Defined benefit pension plan - Reconciliation of plan assets and liabilities (Details) - Defined benefit pension plan - BRL (R$) R$ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Reconciliations of assets and liabilities of the plans |  |  |  |
Net | R$ (658,492) | R$ (1,083,719) |  |
Defined benefit obligation | (658,492) | (1,083,719) |  |
Present value of the defined benefit obligations |  |  |  |
Reconciliations of assets and liabilities of the plans |  |  |  |
Net | (3,841,213) | (5,409,065) | R$ (5,921,285) | R$ (4,601,965)
Plan assets |  |  |  |
Reconciliations of assets and liabilities of the plans |  |  |  |
Net | 3,499,475 | 4,647,361 | R$ 4,652,000 | R$ 3,656,891
Asset ceiling restrictions on recognition of net funded assets |  |  |  |
Reconciliations of assets and liabilities of the plans |  |  |  |
Net | R$ (316,754) | R$ (322,015) |  |

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