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Financial Instruments and Risks - Interest Rate Risk Sensitivity Analysis (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Interest rate risk | CDI | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity |  | R$ 1,105,149
Interest rate risk | CDI | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity |  | 2,532,061
Interest rate risk | SELIC | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | R$ 34,074 |
Interest rate risk | SELIC | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 68,679 |
Interest rate risk | TJLP | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity |  | (3,597)
Interest rate risk | TJLP | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity |  | (7,195)
Interest rate risk | LIBOR | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 149,176 |
Interest rate risk | LIBOR | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 293,316 |
Interest rate risk | Cash and cash equivalents | CDI | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | 3,243,485 |
Interest rate risk | Cash and cash equivalents | CDI | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 53,931 |
Interest rate risk | Cash and cash equivalents | CDI | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 108,701 |
Interest rate risk | Financial investments | CDI | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | 19,049,284 |
Interest rate risk | Financial investments | CDI | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 316,741 |
Interest rate risk | Financial investments | CDI | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 638,412 |
Interest rate risk | Financial investments | SELIC | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | 2,049,281 |
Interest rate risk | Financial investments | SELIC | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 34,074 |
Interest rate risk | Financial investments | SELIC | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 68,679 |
Interest rate risk | Loans and financing | CDI | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (4,078,631) |
Interest rate risk | Loans and financing | CDI | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 316,741 |
Interest rate risk | Loans and financing | CDI | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 638,412 |
Interest rate risk | Loans and financing | TJLP | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (213,178) |
Interest rate risk | Loans and financing | TJLP | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | (3,597) |
Interest rate risk | Loans and financing | TJLP | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | (7,195) |
Interest rate risk | Loans and financing | LIBOR | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (13,038,092) |
Interest rate risk | Loans and financing | LIBOR | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | (88,855) |
Interest rate risk | Loans and financing | LIBOR | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | (177,709) |
Interest rate risk | Debentures | CDI | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (4,663,453) |
Interest rate risk | Debentures | CDI | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | (374,854) |
Interest rate risk | Debentures | CDI | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | (453,602) |
Interest rate risk | Derivatives Swap | CDI | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (853,141) |
Interest rate risk | Derivatives Swap | CDI | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 866,857 |
Interest rate risk | Derivatives Swap | CDI | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 1,746,549 |
Interest rate risk | Derivatives Swap | LIBOR | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (170,708) |
Interest rate risk | Derivatives Swap | LIBOR | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 238,030 |
Interest rate risk | Derivatives Swap | LIBOR | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 471,025 |
Interest rate risk | Derivatives Options | CDI | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (134,813) |
Interest rate risk | Derivatives Options | CDI | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | (74,269) |
Interest rate risk | Derivatives Options | CDI | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | (146,411) |
Commodity price risk | Bunker oil |  |
Financial Instruments and Risks |  |
Risk exposure | 5,000 | R$ 0
Commodity price risk | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (1,140) |
Commodity price risk | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 2,399 |
Commodity price risk | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 3,735 |
Commodity price risk | Oil derivative | Probable |  |
Financial Instruments and Risks |  |
Risk exposure | (1,140) |
Commodity price risk | Oil derivative | Possible Increase of 25% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | 2,399 |
Commodity price risk | Oil derivative | Remote Increase of 50% |  |
Financial Instruments and Risks |  |
Effect on Income and Equity | R$ 3,735 |

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