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Loan Operations and Lease Operations Portfolio - Summary of Loan Operations and Lease Operations by Maturity (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type R$ 536,091 R$ 497,719
Overdue as from 1 day [Member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 19,563 21,974
Falling due up to 3 months [Member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 144,812 127,402
Falling due more than 3 months but less than 1 year [Member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type 127,805 116,089
Falling due after 1 year [Member]    
Disclosure of loans and lease operations [Line Items]    
Loan operations and lease operations by type R$ 243,911 R$ 232,254