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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Derivatives outstanding by type of contract (Details)
R$ in Thousands, $ in Thousands
Jun. 30, 2021
USD ($)
Jun. 30, 2021
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
Financial Instruments and Risks        
Fair value   R$ (4,102,820)   R$ (6,775,980)
Operational Hedge        
Financial Instruments and Risks        
Fair value   860,019   (772,509)
Operational Hedge | ZCC        
Financial Instruments and Risks        
Notional Amount | $ $ 3,777,250   $ 3,212,250  
Fair value   837,500   (780,457)
Operational Hedge | NDF (R$ x US$)        
Financial Instruments and Risks        
Notional Amount | $ 80,000   80,000  
Fair value   22,519   7,948
Debt Hedge        
Financial Instruments and Risks        
Fair value   (5,217,687)   (6,374,130)
Debt Hedge | Interest rate hedge | Swap LIBOR x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ 3,600,000   3,683,333  
Fair value   (706,256)   (1,059,192)
Debt Hedge | Interest rate hedge | Swap IPCA x CDI        
Financial Instruments and Risks        
Notional Amount | $ 843,845   843,845  
Fair value   269,764   285,533
Debt Hedge | Interest rate hedge | Swap IPCA x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ 121,003   121,003  
Fair value   (85,924)   (114,834)
Debt Hedge | Interest rate hedge | Swap CDI x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ 2,267,057   2,267,057  
Fair value   (4,166,257)   (4,977,309)
Debt Hedge | Interest rate hedge | Pre-fixed Swap to U.S.$ (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ 350,000   350,000  
Fair value   (529,014)   (508,328)
Commodity Hedge        
Financial Instruments and Risks        
Fair value   254,848   370,659
Commodity Hedge | Swap US-CPI (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ $ 612,650   646,068  
Fair value   R$ 254,848   354,900
Commodity Hedge | Swap VLSFO        
Financial Instruments and Risks        
Notional Amount | $     $ 37,757  
Fair value       R$ 15,759