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17. LEASES (Details 4) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Presentation of leases for lessee [abstract]    
Variable payments not included in the lease liabilities R$ 300,949 R$ 222,096
Expenses related to short-term assets 162,313 226,010
Expenses related to low-value assets 3,531 4,890
Amounts recognized in the statement of income R$ 466,793 R$ 452,996