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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, 2018 | Dec. 31, 2017
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Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | R$ 72,833 | R$ 63,277
Retail risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 12,822 | 11,870
Commercial risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 26,214 | 24,857
Corporate finance risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 2,697 | 2,663
Negotiation and sales risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 11,736 | 7,434
Payments and settlement risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 8,282 | 7,532
Financial agent services risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 4,343 | 3,893
Asset management risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | 6,715 | 5,010
Retail brokerage risk [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk-weighted assets of operational risk (RWAOPAD) | R$ 24 | R$ 18

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