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CASH AND CASH EQUIVALENTS (Details) - BRL (R$)
R$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Cash equivalents        
Total cash and cash equivalents R$ 7,712,081 R$ 13,590,776 R$ 8,585,570 R$ 6,835,057
Cash and banks        
Cash and cash equivalents        
Cash and banks R$ 6,826,207 11,720,774    
Fixed | Cash and banks        
Cash equivalents        
Average yield p.a. % 1.59%      
Local | Fixed-term deposits (Compromised)        
Cash equivalents        
Fixed-term deposits R$ 63,660 14,506    
Local | CDI | Fixed-term deposits (Compromised)        
Cash equivalents        
Percentage of basis used to calculate interest rate 86.80%      
Foreign | Fixed-term deposits        
Cash equivalents        
Fixed-term deposits R$ 822,214 R$ 1,855,496    
Foreign | Fixed | Fixed-term deposits        
Cash equivalents        
Average yield p.a. % 1.48%