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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Price Risk Sensitivity Analysis (Details) - Commodity price risk - BRL (R$) | 6 Months Ended |
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Jun. 30, 2020 | Dec. 31, 2019
Embedded Derivative | Probable |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | R$ 522,073,000 |
Embedded Derivative | Possible (25%) |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | (117,134,000) |
Embedded Derivative | Remote (50%) |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | (238,426,000) |
Oil derivative | Probable |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | (76,702,000) |
Oil derivative | Possible (25%) |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | 168,646,000 |
Oil derivative | Remote (50%) |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | 260,591,000 |
Oil derivative | Bunker oil |  |
Financial Instruments and Risks Management |  |
Risk exposure | R$ 87,486,000 | R$ 364

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