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Risk and Capital Management - Summary of Risk Level of Financial Assets (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of risk level of financial assets [Line Items]    
Financial assets at fair value through profit or loss 85.20% 82.80%
Total Percentage 100.00% 100.00%
Financial assets at amortised cost R$ 1,010,644 R$ 994,759
Financial assets at fair value through profit or loss 322,929 286,646
Financial Assets R$ 1,501,481 R$ 1,424,876
Interbank deposits and securities purchased under agreements to resell [Member]    
Disclosure of risk level of financial assets [Line Items]    
Percentage of fainancial assets at amortized cost 1.30% 3.80%
Securities [Member]    
Disclosure of risk level of financial assets [Line Items]    
Percentage of fainancial assets at amortized cost 13.50% 13.40%
Insurance financial assets [member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at fair value through profit or loss R$ 197,942 R$ 179,313
Financial Assets 232,311 216,529
Insurance financial assets [member] | Low [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at fair value through profit or loss 197,940 179,311
Financial Assets 232,309 216,527
Insurance financial assets [member] | Medium [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at fair value through profit or loss 2 2
Financial Assets 2 2
Insurance financial assets [member] | High [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at fair value through profit or loss 0  
Insurance financial assets [member] | Interbank deposits and securities purchased under agreements to resell [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at amortised cost 3,027 8,247
Insurance financial assets [member] | Interbank deposits and securities purchased under agreements to resell [Member] | Low [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at amortised cost 3,027 8,247
Insurance financial assets [member] | Interbank deposits and securities purchased under agreements to resell [Member] | Medium [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at amortised cost 0  
Insurance financial assets [member] | Interbank deposits and securities purchased under agreements to resell [Member] | High [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at amortised cost 0  
Insurance financial assets [member] | Securities [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at amortised cost 31,342 28,969
Insurance financial assets [member] | Securities [Member] | Low [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at amortised cost 31,342 R$ 28,969
Insurance financial assets [member] | Securities [Member] | Medium [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at amortised cost 0  
Insurance financial assets [member] | Securities [Member] | High [Member]    
Disclosure of risk level of financial assets [Line Items]    
Financial assets at amortised cost R$ 0