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Securities Sold Under Repurchase Agreements and Interbank and Institutional Market Debts - Summary of Interbank Market Debt (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt R$ 134,670 R$ 124,587 R$ 129,648
Financial credit bills [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt R$ 37,928 27,691  
Financial credit bills [member] | Bottom of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 0.00%    
Financial credit bills [member] | Top of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 110.00%    
Real estate credit bills [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt R$ 9,546 18,525  
Real estate credit bills [member] | Bottom of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 82.00%    
Real estate credit bills [member] | Top of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 95.00%    
Agribusiness credit bills [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt R$ 18,013 15,101  
Agribusiness credit bills [member] | Bottom of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 70.00%    
Agribusiness credit bills [member] | Top of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 98.00%    
Guaranteed real state notes [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 96.00%    
Interbank market debt R$ 1,227    
Import and export financing [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt R$ 50,050 39,089  
Import and export financing [member] | Bottom of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 0.79%    
Import and export financing [member] | Top of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 11.10%    
On-lending - domestic [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt R$ 17,906 24,181  
On-lending - domestic [member] | Bottom of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 2.50%    
On-lending - domestic [member] | Top of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Percentage of interest on interbank market debt 14.50%    
Current [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt R$ 73,176 73,381  
Current [Member] | Financial credit bills [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 9,139 13,234  
Current [Member] | Real estate credit bills [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 6,465 14,046  
Current [Member] | Agribusiness credit bills [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 9,586 7,562  
Current [Member] | Import and export financing [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 42,685 30,548  
Current [Member] | On-lending - domestic [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 5,301 7,991  
Non-current [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 61,494 51,206  
Non-current [Member] | Financial credit bills [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 28,789 14,457  
Non-current [Member] | Real estate credit bills [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 3,081 4,479  
Non-current [Member] | Agribusiness credit bills [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 8,427 7,539  
Non-current [Member] | Guaranteed real state notes [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 1,227    
Non-current [Member] | Import and export financing [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt 7,365 8,541  
Non-current [Member] | On-lending - domestic [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interbank market debt R$ 12,605 R$ 16,190