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22. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
P&L      
Sales R$ 1,674,235 R$ 1,122,834 R$ 1,278,751
Purchases (1,140,632) (1,958,958) (1,418,282)
Financial income (expenses)      
Interest 37,516 64,289 48,796
Exchange rate variations, net   3,586 13,611
Financial investments 1,190,489    
Other operating income and expenses (5,224,682) (4,631,236) 83,332
Net income for the year 4,292,618 2,244,511 5,200,583
Joint-ventures e joint operation [member]      
P&L      
Sales 843   414
Purchases (1,036,420) (1,133,142) (1,307,695)
Financial income (expenses)      
Interest 19,095 43,790 33,911
Other operating income and expenses   (14,939)  
Net income for the year (1,016,482) (1,104,291) (1,273,369)
Subsidiaries and associates [member]      
P&L      
Sales 104,400 75,630 100,608
Purchases   (231,140)  
Financial income (expenses)      
Interest     234
Net income for the year 104,400 (155,510) 100,842
Other related parties [member]      
P&L      
Sales 1,568,992 1,047,204 1,177,730
Purchases (104,212) (594,676) (110,587)
Financial income (expenses)      
Interest 18,421 20,499 14,651
Exchange rate variations, net   3,586 13,611
Financial investments 1,190,489    
Other operating income and expenses   (136,004)  
Net income for the year R$ 2,673,690 R$ 340,609 R$ 1,095,404