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EMPLOYEE BENEFITS - Defined benefit pension plan - Variation of the plan assets (Details) - Defined benefit pension plan - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
EMPLOYEE BENEFITS      
Fair value of the plan assets at the beginning of the year R$ (1,057,849)    
Return of the plan assets 163,148 R$ 59,692 R$ 64,128
Fair value of plan assets at the end of the year (1,138,592) (1,057,849)  
Plan assets      
EMPLOYEE BENEFITS      
Fair value of the plan assets at the beginning of the year 3,568,934 3,456,613 3,292,890
Return of the plan assets 163,148 165,908 169,304
Contributions from sponsors 162,650 197,828 111,450
Settlement (493,781) (64,868) (51,469)
Payment of benefits (309,817) (318,198) (335,471)
Remeasurement 386,767 (253,301) 232,214
Assets held for sale     (73,127)
Exchange Variance 178,990 384,952 110,822
Fair value of plan assets at the end of the year 3,656,891 3,568,934 R$ 3,456,613
Value of shares included in fair value of plan assets R$ 10,221 R$ 3,427