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Risk and Capital Management - Summary of Exposure Weighted by Credit Risk (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	R$ 714,969	R$ 660,516
Marketable securities [member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	40,276	45,629
Loan Operations - Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	124,356	114,141
Loan Operations - Non-Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	256,958	240,816
Joint Liabilities - Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	140	172
Joint Liabilities - Non-Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	43,288	45,405
Loan Commitments - Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	33,871	31,058
Loan Commitments - Non-Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	10,673	9,017
Derivatives - Future potential gain [member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	4,193	5,457
Agency transition [member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	3,330
Other exposures [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	R$ 197,884	R$ 168,821

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The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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