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EMPLOYEE BENEFITS - Summary (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
EMPLOYEE BENEFITS    
Plan assets R$ 4,942 R$ 39,196
Total liabilities 1,415,190 1,861,439
Current 39 208
Non-current 1,415,151 1,861,231
Defined contribution pension plan    
EMPLOYEE BENEFITS    
Plan assets 4,942 39,196
Defined benefit pension plan    
EMPLOYEE BENEFITS    
Total liabilities 1,083,719 1,441,592
Post-employment health care benefit    
EMPLOYEE BENEFITS    
Total liabilities 318,181 362,944
Retirement and termination benefits    
EMPLOYEE BENEFITS    
Total liabilities R$ 13,290 R$ 56,903