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6. TRADE ACCOUNTS RECEIVABLE AND OTHER RECEIVABLES (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Trade accounts receivable, net    
Trade accounts receivable, gross R$ 4,719,137 R$ 3,551,812
Adjustment to present value (13,316) (10,121)
Expected credit losses (605,940) (503,848)
Trade accounts receivable, net 4,099,881 3,037,843
Current 4,136,421 3,090,691
Non-current 49,864 71,029
Other receivables [member]    
Trade accounts receivable, net    
Trade accounts receivable, gross 113,949 153,799
Adjustment to present value (156) (1,936)
Expected credit losses (27,389) (27,986)
Trade accounts receivable, net 86,404 123,877
Current 43,566 59,645
Non-current [1] 42,838 64,232
Domestic [member] | Trade accounts receivables [member]    
Trade accounts receivable, net    
Customers 2,002,586 1,336,762
Foreign [member] | Trade accounts receivables [member]    
Trade accounts receivable, net    
Customers R$ 2,716,551 R$ 2,215,050
[1] Weighted average maturity of 2.26 years.