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Securities Sold Under Repurchase Agreements and Interbank and Institutional Market Funds - Summary of Interbank Market Debt (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds R$ 174,862 R$ 134,670
Financial credit bills [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds R$ 65,433 37,928
Financial credit bills [member] | Bottom of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 4.94%  
Financial credit bills [member] | Top of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 17.68%  
Real estate credit bills [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 12.22%  
Interbank market funds R$ 7,635 9,546
Agribusiness credit bills [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds R$ 21,204 18,013
Agribusiness credit bills [member] | Bottom of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 4.56%  
Agribusiness credit bills [member] | Top of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 15.00%  
Guaranteed real state notes [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds R$ 4,320 1,227
Guaranteed real state notes [member] | Bottom of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 96.00%  
Guaranteed real state notes [member] | Top of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 99.50%  
Import and export financing [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds R$ 64,622 50,050
Import and export financing [member] | Bottom of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 0.00%  
Import and export financing [member] | Top of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 9.60%  
On-lending - domestic [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds R$ 11,648 17,906
On-lending - domestic [member] | Bottom of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 0.00%  
On-lending - domestic [member] | Top of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of interest on interbank market debt 19.79%  
Current [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds R$ 110,017 73,176
Current [member] | Financial credit bills [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 20,829 9,139
Current [member] | Real estate credit bills [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 6,194 6,465
Current [member] | Agribusiness credit bills [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 14,543 9,586
Current [member] | Import and export financing [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 60,530 42,685
Current [member] | On-lending - domestic [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 7,921 5,301
Non-current [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 64,845 61,494
Non-current [member] | Financial credit bills [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 44,604 28,789
Non-current [member] | Real estate credit bills [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 1,441 3,081
Non-current [member] | Agribusiness credit bills [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 6,661 8,427
Non-current [member] | Guaranteed real state notes [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 4,320 1,227
Non-current [member] | Import and export financing [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds 4,092 7,365
Non-current [member] | On-lending - domestic [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interbank market funds R$ 3,727 R$ 12,605