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Loan Operations and Lease Operations Portfolio - Summary of Loan Operations and Lease Operations by Concentration (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Largest debtor [Member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by concentration R$ 5,193 R$ 4,079
10 largest debtors [Member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by concentration 31,564 28,958
20 largest debtors [Member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by concentration 47,433 46,313
50 largest debtors [Member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by concentration 73,358 74,772
100 largest debtors [Member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by concentration R$ 98,675 R$ 101,149