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Financial Instruments and Risks Management - Price Risk Sensitivity Analysis (Details) - Commodity price risk - BRL (R$) | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018
Embedded Derivative | Probable |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | R$ 268,547,000 |
Embedded Derivative | Possible (25%) |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | 107,815,000 |
Embedded Derivative | Remote (50%) |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | 220,514,000 |
Oil derivative | Probable |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | (92,000) |
Oil derivative | Possible (25%) |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | 478,000 |
Oil derivative | Remote (50%) |  |
Financial Instruments and Risks Management |  |
Effect on fair value of assets attributable to an increase in measurement input. | 864,000 |
Oil derivative | Bunker oil |  |
Financial Instruments and Risks Management |  |
Risk exposure | R$ 364 | R$ 5,344,000

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