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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
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