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Loan and Lease Operations Portfolio - Summary of Loan Operations and Lease Operations by Type (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type R$ 585,791 R$ 536,091
Provision for Expected Loss (37,508) (33,509)
Total loan operations and lease operations, net of allowance for Expected Credit Loss 548,283 502,582
Corporate [member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 105,302 102,643
Micro/Small and medium companies [member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 86,220 68,812
Foreign [member] | Foreign loans - Latin America [member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 153,779 152,072
Individuals [member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 240,490 212,564
Individuals [member] | Vehicles [member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 18,968 15,920
Individuals [member] | Credit card [member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 91,676 78,255
Individuals [member] | Personal loan [member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 34,892 29,543
Individuals [member] | Payroll loans [member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 49,608 46,878
Individuals [member] | Mortgages [member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type R$ 45,346 R$ 41,968