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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, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of risk level of financial assets [Line Items]      
Financial assets at fair value through profit or loss 82.90% 82.60%  
Total Percentage 100.00% 100.00%  
Financial assets at amortised cost R$ 994,759 R$ 905,729 R$ 902,289
Financial assets at fair value through profit or loss 286,646 273,536 218,805
Financial Assets R$ 1,424,876 R$ 1,330,251 R$ 1,246,833
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 3.80% 3.50%  
Securities [Member]      
Disclosure of risk level of financial assets [Line Items]      
Percentage of fainancial assets at amortized cost 13.30% 13.90%  
Insurance financial assets [member]      
Disclosure of risk level of financial assets [Line Items]      
Financial assets at fair value through profit or loss R$ 179,773 R$ 168,035  
Financial Assets 216,989 203,312  
Insurance financial assets [member] | Lower risk [Member]      
Disclosure of risk level of financial assets [Line Items]      
Financial assets at fair value through profit or loss 179,771 168,006  
Financial Assets 216,987 203,283  
Insurance financial assets [member] | Satisfactory [Member]      
Disclosure of risk level of financial assets [Line Items]      
Financial assets at fair value through profit or loss 2 4  
Financial Assets 2 4  
Insurance financial assets [member] | Higher Risk [Member]      
Disclosure of risk level of financial assets [Line Items]      
Financial assets at fair value through profit or loss   25  
Financial Assets   25  
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 8,247 7,558  
Insurance financial assets [member] | Interbank deposits and securities purchased under agreements to resell [Member] | Lower risk [Member]      
Disclosure of risk level of financial assets [Line Items]      
Financial assets at amortised cost 8,247 7,558  
Insurance financial assets [member] | Securities [Member]      
Disclosure of risk level of financial assets [Line Items]      
Financial assets at amortised cost 28,969 27,719  
Insurance financial assets [member] | Securities [Member] | Lower risk [Member]      
Disclosure of risk level of financial assets [Line Items]      
Financial assets at amortised cost R$ 28,969 R$ 27,719