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EMPLOYEE BENEFITS - Defined benefit pension plan - Variation of the plan obligations (Details) - Defined benefit pension plan - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EMPLOYEE BENEFITS      
Obligation at the beginning of the year R$ 1,138,591    
Cost of service 69,323 R$ 54,518 R$ 60,803
Interest expense 191,326 189,544 82,513
Past service cost 3,967 2,302 7,065
Obligation at the end of the year 1,441,592 1,138,591  
Present value of the defined benefit obligations      
EMPLOYEE BENEFITS      
Obligation at the beginning of the year 4,601,965 4,391,251 4,314,592
Cost of service 69,323 54,518 60,803
Interest expense 191,326 189,544 188,729
Payment of benefits (434,650) (309,817) (318,198)
Past service cost 3,967 2,302 7,065
Supplementary amounts of the plan     17,078
Settlement (190,948) (498,493) (61,369)
Gain (loss) on remeasurement 467,106 546,911 (370,083)
Exchange Variance 1,213,196 225,749 552,634
Obligation at the end of the year R$ 5,921,285 R$ 4,601,965 R$ 4,391,251