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Risk and Capital Management - Summary of Assets and Liabilities According to Their Remaining Contractual Maturities, Considering Their Undiscounted Flows (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]      
Deposits in Central Bank R$ 94,148 R$ 98,837  
Securities under guarantee transactions 5,120 3,664  
Payment to merchants 60,504 53,687  
Amount of liabilities from transactions related to credit assignments 3,993 4,931  
Compulsory deposits with the Central Bank of Brazil 4,689 (13,137) R$ (19,144)
Interbank deposits [Member]      
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]      
Compulsory deposits with the Central Bank of Brazil R$ 15,886 R$ 6,689