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Financial assets and liabilities - Summary of Credit Risk (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of credit risk exposure [line items] |  |
Exposure to risk | R$ 29,356,555 | R$ 28,531,175
Cash and cash equivalents [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to risk | 16,174,130 | 13,642,918
Trade receivables [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to risk | 2,745,853 | 2,033,441
Marketable securities [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to risk | 4,388,007 | 3,669,109
Restricted cash [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to risk | 58,990 |
Derivative financial instruments [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to risk | 4,732,926 | 8,140,700
Receivables from related parties [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to risk | 416,491 | 929,690
Dividend receivable [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to risk | 519,965 | 80,755
Restricted cash [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to risk | R$ 320,193 | R$ 34,562

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