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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, 2020 | Dec. 31, 2019
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Disclosure of external credit grades [line items] |  |
Counterparty credit rating | R$ 8,672,160 | R$ 5,712,097
AAA [member] |  |
Disclosure of external credit grades [line items] |  |
Counterparty credit rating | 8,190,428 | 4,906,077
AA [member] |  |
Disclosure of external credit grades [line items] |  |
Counterparty credit rating | 317,894 | 331,512
A [member] |  |
Disclosure of external credit grades [line items] |  |
Counterparty credit rating | 163,839 | 418,020
BBB [member] |  |
Disclosure of external credit grades [line items] |  |
Counterparty credit rating |  | R$ 56,488

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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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