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Risk and Capital Management - Summary of Exposure Weighted by Credit Risk (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	R$ 784,730	R$ 714,969
Marketable securities [member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	54,715	40,276
Loan Operations - Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	139,522	124,356
Loan Operations - Non-Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	274,324	256,958
Joint Liabilities - Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	150	140
Joint Liabilities - Non-Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	45,657	43,288
Loan Commitments - Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	37,700	33,871
Loan Commitments - Non-Retail [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	11,138	10,673
Derivatives - Future potential gain [member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	4,787	4,193
Agency transition [member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	2,422	3,330
Other exposures [Member]
Disclosure of credit risk exposure [line items]
Exposure Weighted by Credit Risk (RWACPAD)	R$ 214,315	R$ 197,884

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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
-Name IFRS
-Number 7
-IssueDate 2019-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
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-IssueDate 2019-01-01
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