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Risk and Capital Management - Summary of Assessing Minimum Capital Requirements (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Regulatory Capital Resources [Line Items] |  |
Risk weighted assets | R$ 891,300 | R$ 818,072
Credit risk [member] |  |
Disclosure Of Regulatory Capital Resources [Line Items] |  |
Risk weighted assets | 784,730 | 714,969
Currency, commodities, and ratios [Member] |  |
Disclosure Of Regulatory Capital Resources [Line Items] |  |
Risk weighted assets | 25,002 | 30,270
Operational risk [member] |  |
Disclosure Of Regulatory Capital Resources [Line Items] |  |
Risk weighted assets | R$ 81,568 | R$ 72,833

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