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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Fair value settled amounts (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Financial Instruments and Risks |  |
Cash (paid) received | R$ (4,465,640) | R$ (135,449)
Operational Hedge |  |
Financial Instruments and Risks |  |
Cash (paid) received | (2,328,973) | (40,469)
Operational Hedge | Zero Cost Collar (R$ x U.S.$) |  |
Financial Instruments and Risks |  |
Cash (paid) received | (2,268,158) | (104,040)
Operational Hedge | NDF (R$ x US$) |  |
Financial Instruments and Risks |  |
Cash (paid) received | (60,815) | 63,571
Commodity Hedge |  |
Financial Instruments and Risks |  |
Cash (paid) received | (85,468) | 3,804
Commodity Hedge | Swap Bunker (oil) |  |
Financial Instruments and Risks |  |
Cash (paid) received | (85,468) | 3,804
Debt Hedge |  |
Financial Instruments and Risks |  |
Cash (paid) received | (2,051,199) | (98,784)
Debt Hedge | Swap CDI x Fixed (U.S.$) |  |
Financial Instruments and Risks |  |
Cash (paid) received | (1,888,906) | (68,362)
Debt Hedge | Swap IPCA x CDI |  |
Financial Instruments and Risks |  |
Cash (paid) received | 10,601 | 23,024
Debt Hedge | Swap IPCA x Fixed (U.S.$) |  |
Financial Instruments and Risks |  |
Cash (paid) received | 10,054 |
Debt Hedge | Swap Pre-Fixed to U.S.$ (U.S.$) |  |
Financial Instruments and Risks |  |
Cash (paid) received | 59,351 | (26,358)
Debt Hedge | Swap LIBOR x Fixed (U.S.$) |  |
Financial Instruments and Risks |  |
Cash (paid) received | R$ (242,299) | R$ (27,088)

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