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Interbank Deposits and Securities Purchased Under Agreements to Resell - Summary of Interbank Deposits and Securities Purchased Under Agreements to Resell (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items]      
Securities purchased under agreements to resell R$ 35,883 R$ 55,104 R$ 49,238
Interbank deposits 4,561 3,295 R$ 15,327
Interbank deposits and securities purchased under agreements to resell [Member]      
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items]      
Securities purchased under agreements to resell 198,422 280,132  
Collateral held 45,063 63,485  
Collateral repledge 134,116 170,510  
Assets received as collateral with right to sell or repledge 6,644 28,369  
Assets received as collateral without right to sell or repledge 127,472 142,141  
Collateral sold 19,243 46,137  
Interbank deposits 34,581 26,414  
Total 233,003 306,546  
Current [member] | Interbank deposits and securities purchased under agreements to resell [Member]      
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items]      
Securities purchased under agreements to resell 198,260 280,029  
Collateral held 44,901 63,392  
Collateral repledge 134,116 170,500  
Assets received as collateral with right to sell or repledge 6,644 28,369  
Assets received as collateral without right to sell or repledge 127,472 142,131  
Collateral sold 19,243 46,137  
Interbank deposits 31,075 25,726  
Total 229,335 305,755  
Non-current [member]      
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items]      
Collateral repledge   10  
Assets received as collateral without right to sell or repledge   10  
Non-current [member] | Interbank deposits and securities purchased under agreements to resell [Member]      
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items]      
Securities purchased under agreements to resell 162 103  
Collateral held 162 93  
Interbank deposits 3,506 688  
Total R$ 3,668 R$ 791