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Risks and Financial Instruments - Summary of Credit Risk of Cash, Cash Equivalents and Financial Investments (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of external credit grades [line items] |  |
Counterparty credit rating | R$ 5,712,097 | R$ 6,994,406
AAA [member] |  |
Disclosure of external credit grades [line items] |  |
Counterparty credit rating | 4,906,077 | 5,933,671
AA [member] |  |
Disclosure of external credit grades [line items] |  |
Counterparty credit rating | 331,512 | 707,358
A [member] |  |
Disclosure of external credit grades [line items] |  |
Counterparty credit rating | 418,020 | 262,553
BBB [member] |  |
Disclosure of external credit grades [line items] |  |
Counterparty credit rating | R$ 56,488 | R$ 90,824

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References No definition available. + Details
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