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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, 2021
Dec. 31, 2020
Dec. 31, 2019
EMPLOYEE BENEFITS      
Obligation at the beginning of the year R$ 1,441,592    
Cost of service 74,840 R$ 69,323 R$ 54,518
Interest expense 170,897 191,326 189,544
Past service cost 7,093 3,967 2,302
Obligation at the end of the year 1,083,719 1,441,592  
Present value of the defined benefit obligations      
EMPLOYEE BENEFITS      
Obligation at the beginning of the year 5,921,285 4,601,965 4,391,251
Cost of service 74,840 69,323 54,518
Interest expense 170,897 191,326 189,544
Payment of benefits (486,310) (434,650) (309,817)
Past service cost 7,093 3,967 2,302
Settlement (228,881) (190,948) (498,493)
Gain (loss) on remeasurement (457,421) 467,106 546,911
Exchange Variance 407,562 1,213,196 225,749
Obligation at the end of the year R$ 5,409,065 R$ 5,921,285 R$ 4,601,965