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Financial Instruments and Risks - Credit Risk External Risk Rating (Details) - Credit risk - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Cash and cash equivalents and financial investments |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | R$ 25,486,018 | R$ 2,708,338
Cash and cash equivalents and financial investments | AAA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 19,736,151 | 2,168,810
Cash and cash equivalents and financial investments | AA+ |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 5,257,518 | 169,881
Cash and cash equivalents and financial investments | AA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 68,207 | 207,925
Cash and cash equivalents and financial investments | AA- |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 422,899 | 113,623
Cash and cash equivalents and financial investments | A |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 80 | 45,753
Cash and cash equivalents and financial investments | A- |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 1,160 | 2,330
Cash and cash equivalents and financial investments | BB |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 2 | 16
Derivative financial instruments |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 493,934 | 133,910
Derivative financial instruments | AAA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 141,296 | 65,510
Derivative financial instruments | AA+ |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating |  | 51,231
Derivative financial instruments | AA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 259,711 | 3,143
Derivative financial instruments | AA- |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating |  | R$ 14,026
Derivative financial instruments | A |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 51,281 |
Derivative financial instruments | BB |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | R$ 41,646 |

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