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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, 2020
Dec. 31, 2019
Dec. 31, 2018
EMPLOYEE BENEFITS      
Fair value of the plan assets at the beginning of the year R$ (1,138,591)    
Return of the plan assets 156,475 R$ 163,148 R$ 59,692
Fair value of plan assets at the end of the year (1,441,592) (1,138,591)  
Plan assets      
EMPLOYEE BENEFITS      
Fair value of the plan assets at the beginning of the year 3,656,891 3,568,934 3,456,613
Return of the plan assets 156,475 163,148 165,908
Contributions from sponsors 224,979 162,650 197,828
Settlement (179,339) (493,781) (64,868)
Payment of benefits (434,650) (309,817) (318,198)
Remeasurement 334,675 386,767 (253,301)
Exchange Variance 892,969 178,990 384,952
Fair value of plan assets at the end of the year 4,652,000 3,656,891 R$ 3,568,934
Value of shares included in fair value of plan assets R$ 8,745 R$ 10,221