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Risk and Capital Management - Additional Information (Detail)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Nov. 19, 2019
BRL (R$)
Nov. 19, 2019
USD ($)
Disclosure of financial risk and capital management [line items]        
Total credit and finance lease operations R$ 260,453.0 R$ 222,481.0    
Total assets repossessed R$ 390.0 657.0    
VaR calculation confidence level percentage 99.00%      
VaR calculation period historical period of 4 years (1000 business days)      
VaR minimum horizon period in business days 1 day      
Value at risk R$ 278.3 R$ 381.5    
Percentage of VaR of total stockholders' equity 0.24% 0.29%    
Funds from clients R$ 277,000.0      
Percentage of aggregate funds from customers available on demand 38.70%      
Liquid assets R$ 172,900.0      
Percentage of financial assets 100.00% 100.00%    
Subordinated debt R$ 36,627.0      
Capital required for market risk standardized model, percentage 80.00%      
Market risk weighted assets R$ 25,002.0 R$ 22,871.0    
Basel Ratio 15.80%      
Surplus Capital in relation to the Minimum Referential Equity Required R$ 69,292.0      
Additional Common Equity Tier I Required (ACPRequired) R$ 31,195.0 R$ 19,429.0    
Fixed assets commitment percenatge 50.00%      
Fixed Asset Ratio 27.90%      
Surplus in Relation to Fixed Assets R$ 31,104.0      
Increase Decrease Capital Risk Weighted Assets Ratio 3.50% 2.375%    
Basel Ratio [Member]        
Disclosure of financial risk and capital management [line items]        
Increase Decrease Capital Risk Weighted Assets Ratio 2.20%      
Central Bank of Brazil [member]        
Disclosure of financial risk and capital management [line items]        
Tier II Capital Percentage Increase 0.60%      
International market [member]        
Disclosure of financial risk and capital management [line items]        
Debt Instrument Face Amount 1     R$ 3,023.0 $ 750
Local Market [member]        
Disclosure of financial risk and capital management [line items]        
Debt Instrument Face Amount 1     R$ 2,330.0  
Average [Member]        
Disclosure of financial risk and capital management [line items]        
Value at risk R$ 333.7 R$ 399.3    
RWAMINT [Member]        
Disclosure of financial risk and capital management [line items]        
Market risk weighted assets 25,002.0 R$ 30,270.0    
Internal credit grades [member]        
Disclosure of financial risk and capital management [line items]        
Market risk weighted assets R$ 22,663.0      
Short term redeemable obligation [Member]        
Disclosure of financial risk and capital management [line items]        
Percentage of financial assets 62.40%      
Funding [Member]        
Disclosure of financial risk and capital management [line items]        
Percentage of financial assets 24.20%      
Total assets [Member]        
Disclosure of financial risk and capital management [line items]        
Percentage of financial assets 16.60%      
IRB-Brasil Resseguros S.A. [Member] | Credit risk [member]        
Disclosure of financial risk and capital management [line items]        
Percentage of reinsurance premiums operations 86.02% 78.13%    
IRB Brasil [member] | Credit risk [member]        
Disclosure of financial risk and capital management [line items]        
Percentage of social security operations related to reinsurance premiums 30.00%      
General Reinsurance AG [Member] | Credit risk [member]        
Disclosure of financial risk and capital management [line items]        
Percentage of social security operations related to reinsurance premiums 30.00% 30.00%    
Austral [member] | Credit risk [member]        
Disclosure of financial risk and capital management [line items]        
Percentage of social security operations related to reinsurance premiums 40.00%