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Shareholders' equity - Summary of Calculation of Dividends and Interest on Capital (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Dividends [abstract] |  |  |
Statutory net income | R$ 26,712 | R$ 21,945 | R$ 21,108
Legal reserve | (1,336) | (1,097) | (1,055)
Dividend calculation basis | 25,376 | 20,848 | 20,053
Mandatory dividend | 6,344 | 5,212 | 5,013
Dividends and Interest on Capital Paid / Accrued / Identified | R$ 18,777 | R$ 22,437 | R$ 17,558

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- Definition A component of equity representing reserves created based on legal requirements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disclosure of dividends. + References No definition available. + Details
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- Definition Dividend Calculation Basis + References No definition available. + Details
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- Definition Dividends and interest on capital paid. + References No definition available. + Details
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- Definition Legal reserve. + References No definition available. + Details
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- Definition Mandatory Dividend + References No definition available. + Details
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