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Financial assets and liabilities - Summary of Credit Risk Rating (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of external credit grades [line items] |  |
Credit rating | R$ 25,354,053 | R$ 25,487,289
AAA credit rating [member] |  |
Disclosure of external credit grades [line items] |  |
Credit rating | 23,080,390 | 20,878,272
AA credit rating [member] |  |
Disclosure of external credit grades [line items] |  |
Credit rating | 2,239,266 | 3,991,846
BBB |  |
Disclosure of external credit grades [line items] |  |
Credit rating | R$ 34,397 | R$ 617,171

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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