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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Derivative Fair value by maturity schedule (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | R$ (6,775,980) | R$ (1,818,941)
Later than one year and not later than two years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (1,507,075) | (633,644)
Later than two years and not later than three years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (918,030) | 98,850
Later than three years and not later than four years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (433,195) | (154,734)
Later than four years and not later than five years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (705,859) | 185,209
Later than five years and not later than six years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (1,684,124) | (197,718)
Later than six years and not later than seven years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net |  | (606,827)
Later than six years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | R$ (1,527,697) |
Later than seven years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net |  | R$ (510,077)

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