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EMPLOYEE BENEFIT PLANS - Sensitivity Analysis (Details) - Defined benefit plan
R$ in Thousands
Dec. 31, 2020
BRL (R$)
Discount rate  
Sensitivity analysis regarding the relevant assumptions of the plans  
Changes in premise (as a percent) 0.50%
Increase in present value, net R$ (729,203)
Decrease in present value, net R$ 824,894
Medical cost growth rate  
Sensitivity analysis regarding the relevant assumptions of the plans  
Changes in premise (as a percent) 1.00%
Increase in present value, net R$ 876,554
Decrease in present value, net R$ (689,324)