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Financial Investments (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Financial Investments |  |
Financial Investments | R$ 21,098,565 | R$ 1,631,505
Financial assets measured at fair value through profit or loss held for trading |  |
Financial Investments |  |
Financial Investments | 21,098,565 | 1,631,505
Financial assets measured at fair value through profit or loss held for trading | Investment funds |  |
Financial Investments |  |
Financial Investments | R$ 14,933,513 | 1,593,066
Financial assets measured at fair value through profit or loss held for trading | Investment funds | CDI | Minimum |  |
Financial Investments |  |
Percentage of basis used to calculate interest rate | 99.19% |
Financial assets measured at fair value through profit or loss held for trading | Investment funds | CDI | Maximum |  |
Financial Investments |  |
Percentage of basis used to calculate interest rate | 100.17% |
Financial assets measured at fair value through profit or loss held for trading | Bank Deposit Certificates ("CDB") |  |
Financial Investments |  |
Financial Investments | R$ 4,115,771 | R$ 38,439
Financial assets measured at fair value through profit or loss held for trading | Bank Deposit Certificates ("CDB") | CDI | Average |  |
Financial Investments |  |
Percentage of basis used to calculate interest rate | 101.37% | 102.48%
Financial assets measured at fair value through profit or loss held for trading | Government Securities |  |
Financial Investments |  |
Financial Investments | R$ 2,049,281 |
Financial assets measured at fair value through profit or loss held for trading | Government Securities | SELIC |  |
Financial Investments |  |
Percentage of basis used to calculate interest rate | 100.00% |

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