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23. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Derivative financial instruments liabilities, Current R$ (384,969) R$ (153,612)
Derivative financial instruments liabilities, Non-current 727 3
Derivative financial instruments liabilities (385,696) (153,615)
Derivative financial assets, current 377,756 195,324
Derivative financial assets, non current 234 49,991
Derivative financial assets 377,990 245,315
Restricted cash, Current 1 296,294
Restricted cash, Non-current 24,357
Liquidity risk [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Foreign currency loans and borrowings, current (575,147)  
Foreign currency loans and borrowings, non current (15,163,987)  
Foreign currency loans and borrowings (15,739,134) (11,006,524)
Local currency loans and borrowings, current (484,837)  
Local currency loans and borrowings, non current (6,180,455)  
Local currency loans and borrowings (6,665,292) (7,613,755)
Derivative financial instruments liabilities, Current (384,969)  
Derivative financial instruments liabilities, Non-current (727)  
Derivative financial instruments liabilities (385,696) (153,612)
Gross debt, Current (1,444,953)  
Gross debt, Non-current (21,345,169)  
Gross debt (22,790,122) (18,773,891)
Marketable securities and cash and cash equivalents, Current 7,890,783  
Marketable securities and cash and cash equivalents, Non-current 344,577  
Marketable securities and cash and cash equivalents 8,235,360 4,963,319
Derivative financial assets, current 377,756  
Derivative financial assets, non current 234  
Derivative financial assets 377,990 245,315
Restricted cash, Current 1  
Restricted cash, Non-current 24,357  
Restricted cash 24,358 296,294
Net debt R$ (14,152,414) R$ (13,268,963)