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Financial Instruments and Risks - Exchange Risk Sensitivity Analysis (Details) - Exchange rate risk - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income |  | R$ (10,945,465)
Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income |  | R$ (22,294,390)
Cash and cash equivalents | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | R$ 1,143,968 |
Cash and cash equivalents | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income | 285,992 |
Cash and cash equivalents | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income | 571,984 |
Trade accounts receivable | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | 1,661,108 |
Trade accounts receivable | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income | 415,277 |
Trade accounts receivable | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income | 830,554 |
Trade accounts payable | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (72,680) |
Trade accounts payable | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income | (18,170) |
Trade accounts payable | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income | (36,340) |
Loans and financing | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (26,384,721) |
Loans and financing | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income | (6,596,180) |
Loans and financing | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income | (13,192,361) |
Liabilities for assets acquisitions | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (333,049) |
Liabilities for assets acquisitions | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income | (83,262) |
Liabilities for assets acquisitions | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income | (166,524) |
Derivatives Non Deliverable Forward ("NDF") | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | 17,041 |
Derivatives Non Deliverable Forward ("NDF") | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income | (137,748) |
Derivatives Non Deliverable Forward ("NDF") | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income | (275,191) |
Derivatives Swap | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (853,141) |
Derivatives Swap | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income | (2,458,607) |
Derivatives Swap | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income | (4,915,329) |
Derivatives Options | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (134,784) |
Derivatives Options | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income | (2,352,766) |
Derivatives Options | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income | R$ (5,111,182) |

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