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Financial Instruments and Risks Management - Credit risk External Risk Rating (Details) - Credit risk - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Cash and cash equivalents and marketable securities |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | R$ 9,579,461 | R$ 25,486,016
Cash and cash equivalents and marketable securities | AAA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 190,360 | 19,736,151
Cash and cash equivalents and marketable securities | AA+ |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating |  | 5,257,518
Cash and cash equivalents and marketable securities | AA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating |  | 68,207
Cash and cash equivalents and marketable securities | AA- |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 56,388 | 422,899
Cash and cash equivalents and marketable securities | A+ |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 606,757 |
Cash and cash equivalents and marketable securities | A |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 188,458 | 80
Cash and cash equivalents and marketable securities | A- |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 211,238 | 1,160
Cash and cash equivalents and marketable securities | brAAA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 7,153,079 |
Cash and cash equivalents and marketable securities | brAA+ |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 745,177 |
Cash and cash equivalents and marketable securities | brAA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 372,188 |
Cash and cash equivalents and marketable securities | brAA- |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 23,050 |
Cash and cash equivalents and marketable securities | brA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 17,847 |
Cash and cash equivalents and marketable securities | Others |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 14,919 | 1
Derivative financial instruments |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 830,426 | 493,934
Derivative financial instruments | AAA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating |  | 141,296
Derivative financial instruments | AA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating |  | 259,711
Derivative financial instruments | A+ |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 27,363 |
Derivative financial instruments | A |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 165,851 | 51,281
Derivative financial instruments | A- |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 222,761 |
Derivative financial instruments | brAAA |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | 404,693 |
Derivative financial instruments | brAA+ |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating | R$ 9,758 |
Derivative financial instruments | Others |  |
Financial Instruments and Risks |  |
Credit risk exposure, external rating |  | R$ 41,646

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