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Loan and Lease Operations Portfolio - Summary of Loan Operations and Lease Operations by Concentration (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Largest debtor [member] |  |
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by concentration | R$ 5,389 | R$ 5,193
10 largest debtors [member] |  |
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by concentration | 29,340 | 31,564
20 largest debtors [member] |  |
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by concentration | 44,712 | 47,433
50 largest debtors [member] |  |
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by concentration | 71,965 | 73,358
100 largest debtors [member] |  |
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by concentration | R$ 97,695 | R$ 98,675

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