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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Fair value settled amounts (Details) - BRL (R$)
R$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Financial Instruments and Risks    
Cash (paid) received R$ (1,834,250) R$ (135,449)
Operational Hedge    
Financial Instruments and Risks    
Cash (paid) received (993,295) (40,469)
Operational Hedge | Zero cost collar (U.S.$ x R$)    
Financial Instruments and Risks    
Cash (paid) received (962,595) (104,040)
Operational Hedge | NDF (R$ x US$)    
Financial Instruments and Risks    
Cash (paid) received (30,700) 63,571
Commodity hedge    
Financial Instruments and Risks    
Cash (paid) received (36,805) 3,804
Commodity hedge | Swap Bunker (oil)    
Financial Instruments and Risks    
Cash (paid) received (36,805) 3,804
Debt hedge    
Financial Instruments and Risks    
Cash (paid) received (804,150) (98,784)
Debt hedge | Swap CDI x Fixed (U.S.$)    
Financial Instruments and Risks    
Cash (paid) received (369,601) (68,362)
Debt hedge | Swap IPCA x CDI    
Financial Instruments and Risks    
Cash (paid) received (441,056) 23,024
Debt hedge | Swap IPCA x U.S.$    
Financial Instruments and Risks    
Cash (paid) received 10,054  
Debt hedge | Swap Pre-Fixed to U.S.$ (U.S.$)    
Financial Instruments and Risks    
Cash (paid) received 59,351 (26,358)
Debt hedge | Swap LIBOR x Fixed (U.S.$)    
Financial Instruments and Risks    
Cash (paid) received R$ (62,898) R$ (27,088)