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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Derivative Fair value by maturity schedule (Details) - BRL (R$) R$ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | R$ (4,102,820) | R$ (6,775,980)
Not later than one year |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | 74,613 | (1,507,075)
Later than one year and not later than two years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (258,065) | (918,030)
Later than two years and not later than three years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (225,705) | (433,195)
Later than three years and not later than four years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (578,197) | (705,859)
Later than four years and not later than five years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (1,574,105) | (1,684,124)
Later than five years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | R$ (1,541,361) | R$ (1,527,697)

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