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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
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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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- Definition 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 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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