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Risk and Capital Management - Summary of Risk-Weighted Assets of Market Risk (RWAMINT) (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] |  |
Market risk weighted assets | R$ 25,002 | R$ 22,871
Fixed rate denominated in reais | 24,724 | 30,286
Operations subject to commodity price variation | 1,087 | 389
Operations subject to stock price variation | 1,162 | 362
Operations subject to risk exposures in gold, foreign currency and foreign exchange variation | 1,355 | 6,801
Internal credit grades [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Market risk weighted assets | (3,327) | (7,568)
Fixed rate denominated in Real [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Fixed rate denominated in reais | 5,273 | 2,026
Foreign currency coupon [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Fixed rate denominated in reais | 13,118 | 19,633
Price index coupon [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Fixed rate denominated in reais | 6,333 | 8,627
RWAMPAD [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Market risk weighted assets | 28,328 | 37,838
Minimum Market Risk Weighted Assets-Standard Aproach | 22,663 | 30,270
RWAMINT [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Market risk weighted assets | R$ 25,002 | R$ 30,270

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