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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Price risk (Details) - Commodity price risk
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
Probable      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Percentage change in sensitivity analysis scenario   2.16%  
Possible (+25%)      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Percentage change in sensitivity analysis scenario   2.70%  
Remote (+50%)      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Percentage change in sensitivity analysis scenario   3.24%  
Embedded derivative | Probable      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Effect on fair value of assets attributable to an increase in measurement input. R$ 354,900,000    
Embedded derivative | Possible (+25%)      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Effect on fair value of assets attributable to an increase in measurement input. (158,373,000)    
Embedded derivative | Remote (+50%)      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Effect on fair value of assets attributable to an increase in measurement input. (324,287,000)    
Oil derivative | Bunker oil      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Risk exposure   $ 37,757 R$ 364.5
VLSFO/Brent derivative | Probable      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Effect on fair value of assets attributable to an increase in measurement input. 15,759,000    
VLSFO/Brent derivative | Possible (+25%)      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Effect on fair value of assets attributable to an increase in measurement input. 43,614,000    
VLSFO/Brent derivative | Remote (+50%)      
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT      
Effect on fair value of assets attributable to an increase in measurement input. R$ 87,227,000