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EMPLOYEE BENEFITS - Post-employment health care benefit plan - Change in plan assets (Details) - Post-employment health care benefit - Plan assets - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
EMPLOYEE BENEFITS      
Fair value of the plan assets at the beginning of the year R$ 0 R$ 0  
Contributions from sponsors 24,713 19,150 R$ 13,243
Contributions from participants 2,032 2,349 2,088
Payment of benefits (26,745) (21,499) (15,331)
Fair value of plan assets at the end of the year R$ 0 R$ 0 R$ 0