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Stockholders' equity - Summary of Capital reserves and profit reserves (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure of reserves within equity [line items] |  |  |
Capital reserves | R$ 2,250 | R$ 2,326 | R$ 1,982
Profit reserves | 66,161 | 47,347 | 43,019
Total reserves at parent company | 68,411 | 49,673 | 45,001
Premium on subscription of shares [Member] |  |  |
Disclosure of reserves within equity [line items] |  |  |
Capital reserves | 284 | 284 | 284
Share-based payment [member] |  |  |
Disclosure of reserves within equity [line items] |  |  |
Capital reserves | 1,962 | 2,038 | 1,694
Reserves from tax incentives, restatement of equity securities and other [Member] |  |  |
Disclosure of reserves within equity [line items] |  |  |
Capital reserves | 4 | 4 | 4
Legal [Member] |  |  |
Disclosure of reserves within equity [line items] |  |  |
Profit reserves | 13,586 | 12,274 | 11,326
Statutory [Member] |  |  |
Disclosure of reserves within equity [line items] |  |  |
Profit reserves | 64,092 | 46,590 | 43,210
Corporate reorganizations [member] |  |  |
Disclosure of reserves within equity [line items] |  |  |
Profit reserves | R$ (11,517) | R$ (11,517) | R$ (11,517)

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- Definition A component of equity representing the capital reserves. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Appropriated reserves. + References No definition available. + Details
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- Details
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- Details
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