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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Derivatives outstanding by type of contract (Details)
R$ in Thousands, $ in Thousands
Jun. 30, 2022
USD ($)
Jun. 30, 2022
BRL (R$)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
BRL (R$)
Financial Instruments and Risks        
Fair value   R$ (2,017,814)   R$ (6,452,388)
Operational Hedge        
Financial Instruments and Risks        
Fair value   834,728   (194,831)
Operational Hedge | ZCC        
Financial Instruments and Risks        
Notional Amount | $ $ 4,449,600   $ 4,494,125  
Fair value   894,486   (187,788)
Operational Hedge | NDF (R$ x US$)        
Financial Instruments and Risks        
Notional Amount | $ 250,100   30,000  
Fair value   (59,758)   (7,043)
Debt Hedge        
Financial Instruments and Risks        
Fair value   (2,828,509)   (6,285,722)
Debt Hedge | Swap LIBOR to Fixed (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ 3,200,000   3,600,000  
Fair value   616,519   (395,675)
Debt Hedge | Swap IPCA to CDI        
Financial Instruments and Risks        
Notional Amount | $ 843,845   843,845  
Fair value   289,721   249,653
Debt Hedge | Swap IPCA to Fixed (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ 121,003   121,003  
Fair value   (37,456)   (148,583)
Debt Hedge | Swap CDI x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ 2,065,419   2,267,057  
Fair value   (3,100,446)   (5,230,612)
Debt Hedge | Pre-fixed Swap to U.S.$ (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ 350,000   350,000  
Fair value   (596,847)   (760,505)
Commodity Hedge        
Financial Instruments and Risks        
Fair value   (24,033)   28,165
Commodity Hedge | Swap US-CPI (U.S.$)        
Financial Instruments and Risks        
Notional Amount | $ $ 121,345   $ 590,372  
Fair value   R$ (24,033)   R$ 28,165