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16. LEASES (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
PresentationOfLeasesForLesseeLineItems [Line Items]      
Leases R$ 1,623,523 R$ 1,501,960  
Present value adjustment - Leases (1,093,392) (1,027,570)  
Total lease liabilities 530,131 R$ 474,390 R$ 640,989
Less Than One Year [member]      
PresentationOfLeasesForLesseeLineItems [Line Items]      
Leases 98,788    
Present value adjustment - Leases (5,162)    
Total lease liabilities 93,626    
Between one and five years [member]      
PresentationOfLeasesForLesseeLineItems [Line Items]      
Leases 368,659    
Present value adjustment - Leases (110,034)    
Total lease liabilities 258,625    
Over five years [member]      
PresentationOfLeasesForLesseeLineItems [Line Items]      
Leases 1,156,076    
Present value adjustment - Leases (978,196)    
Total lease liabilities R$ 177,880