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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items]      
Securities purchased under agreements to resell R$ 55,104 R$ 49,238 R$ 64,219
Interbank deposits 3,295 15,327 R$ 13,358
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 280,132 244,699  
Collateral held 63,485 59,403  
Collateral repledge 170,510 147,749  
Assets received as collateral with right to sell or repledge 28,369 55,004  
Assets received as collateral without right to sell or repledge 142,141 92,745  
Collateral sold 46,137 37,547  
Interbank deposits 26,414 29,048  
Total 306,546 273,747  
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 280,029 244,503  
Collateral held 63,392 59,207  
Collateral repledge 170,500 147,749  
Assets received as collateral with right to sell or repledge 28,369 55,004  
Assets received as collateral without right to sell or repledge 142,131 92,745  
Collateral sold 46,137 37,547  
Interbank deposits 25,726 28,034  
Total 305,755 272,537  
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 103 196  
Collateral held 93 196  
Collateral repledge 10    
Assets received as collateral with right to sell or repledge 0    
Assets received as collateral without right to sell or repledge 10    
Collateral sold 0    
Interbank deposits 688 1,014  
Total R$ 791 R$ 1,210