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14. LOANS AND BORROWINGS (Details 4) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
DisclosureOfLoansAndFinancingLineItems [Line Items]      
Total of loans and financing R$ 22,404,426 R$ 18,620,279 R$ 22,165,444
Mortgage guarantees 44,816 51,237  
Related to FINEM-BNDES [member]      
DisclosureOfLoansAndFinancingLineItems [Line Items]      
Mortgage guarantees 45,516  
Related to tax incentives and other [member]      
DisclosureOfLoansAndFinancingLineItems [Line Items]      
Mortgage guarantees R$ 44,816 R$ 5,721