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Risk and Capital Management - Maximum Exposure of Loan Operations and Lease Operations Portfolio Segregated By Business Sector (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of credit risk exposure [line items] |  |
Loan operations and lease operations portfolio | R$ 585,791 | R$ 536,091
Loan operations and lease operations percentage | 100.00% | 100.00%
Industry and commerce [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Loan operations and lease operations portfolio | R$ 129,998 | R$ 115,225
Loan operations and lease operations percentage | 22.20% | 21.50%
Services [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Loan operations and lease operations portfolio | R$ 126,718 | R$ 119,487
Loan operations and lease operations percentage | 21.60% | 22.30%
Other sectors [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Loan operations and lease operations portfolio | R$ 26,693 | R$ 29,388
Loan operations and lease operations percentage | 4.60% | 5.50%
Individuals [member] |  |
Disclosure of credit risk exposure [line items] |  |
Loan operations and lease operations portfolio | R$ 302,382 | R$ 271,991
Loan operations and lease operations percentage | 51.60% | 50.70%

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