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Risk and Capital Management - Summary of Composition of the Operational Risk Weighted Assets (RWAOPAD) (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | R$ 81,568 | R$ 72,833
Retail risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 14,005 | 12,822
Commercial risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 27,536 | 26,214
Corporate finance risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 2,746 | 2,697
Negotiation and sales risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 15,430 | 11,736
Payments and settlement risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 8,802 | 8,282
Financial agent services risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 4,641 | 4,343
Asset management risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 8,101 | 6,715
Retail brokerage risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | R$ 307 | R$ 24

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