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Interbank Deposits and Securities Purchased Under Agreements to Resell - Summary of Interbank Deposits and Securities Purchased Under Agreements to Resell (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items]    
Amounts pledged in guarantee of operations R$ 8,544 R$ 5,120
Losses (8) (10)
B3 S.A. - Brasil, Bolsa, Balco [Member]    
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items]    
Amounts pledged in guarantee of operations 8,544  
Amounts pledged in guarantee of repurchase agreement transactions R$ 153,359  
Central Bank [Member]    
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items]    
Amounts pledged in guarantee of operations   5,120
Amounts pledged in guarantee of repurchase agreement transactions   R$ 216,647