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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Derivative Fair value by maturity schedule (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial Instruments and Risks    
Derivative fair value asset (liability), net R$ (6,452,388) R$ (6,775,980)
Up to 1 year    
Financial Instruments and Risks    
Derivative fair value asset (liability), net (1,093,198) (1,507,075)
1 - 2 years    
Financial Instruments and Risks    
Derivative fair value asset (liability), net (282,499) (918,030)
2 - 3 years    
Financial Instruments and Risks    
Derivative fair value asset (liability), net (759,082) (433,195)
3 - 4 years    
Financial Instruments and Risks    
Derivative fair value asset (liability), net (2,096,449) (705,859)
More than 4 years    
Financial Instruments and Risks    
Derivative fair value asset (liability), net R$ (2,221,160)  
4 - 5 years    
Financial Instruments and Risks    
Derivative fair value asset (liability), net   (1,684,124)
More than 5 years    
Financial Instruments and Risks    
Derivative fair value asset (liability), net   R$ (1,527,697)