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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]      
Deposits in Central Bank R$ 91,248 R$ 94,148  
Securities under guarantee transactions 8,544 5,120  
Payment to merchants 69,050 60,504  
Amount of liabilities from transactions related to credit assignments 2,451 3,993  
Compulsory deposits with the Central Bank of Brazil 2,900 4,689 R$ (13,137)
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$ 18,938 R$ 15,886