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Financial Assets at Amortized Cost-Securities - Summary of Financial Assets at Amortized Cost - Securities (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Financial Assets [Line Items]    
Securities Pledged as Collateral of Funding Transactions of Financial Institutions and Clients R$ 27,040 R$ 33,848
Brazilian government securities [member]    
Disclosure of Financial Assets [Line Items]    
Securities Pledged as Collateral of Funding Transactions of Financial Institutions and Clients 9,583 24,988
Corporate debt securities [member]    
Disclosure of Financial Assets [Line Items]    
Securities Pledged as Collateral of Funding Transactions of Financial Institutions and Clients R$ 17,457 R$ 8,860