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Risk and Capital Management - Summary of Financial Assets Individually Evaluated Classified by Rating (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 765,719,000,000 R$ 752,920,000,000
Other financial assets, individually evaluated, classified by rating, percentage 100.00% 100.00%
Low [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 758,517,000,000 R$ 743,932,000,000
Medium [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating 4,673,000,000 4,985,000,000
High [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating 2,529,000,000 4,003,000,000
Interbank deposits and securities purchased under agreements to resell [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 233,011,000,000 R$ 306,556,000,000
Other financial assets, individually evaluated, classified by rating, percentage 30.40% 40.60%
Interbank deposits and securities purchased under agreements to resell [Member] | Low [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 233,011,000,000 R$ 306,556,000,000
Interbank deposits and securities purchased under agreements to resell [Member] | Medium [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating 0  
Interbank deposits and securities purchased under agreements to resell [Member] | High [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating 0  
Financial assets at fair value through profit or loss [member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 133,119,000,000 R$ 110,395,000,000
Other financial assets, individually evaluated, classified by rating, percentage 17.40% 14.70%
Financial assets at fair value through profit or loss [member] | Low [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 127,251,000,000 R$ 103,157,000,000
Financial assets at fair value through profit or loss [member] | Medium [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating 3,721,000,000 3,645,000,000
Financial assets at fair value through profit or loss [member] | High [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating 2,147,000,000 3,593,000,000
Financial assets designated at fair value through profit or loss [member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 322,929,000,000 R$ 286,646,000,000
Other financial assets, individually evaluated, classified by rating, percentage 42.20% 38.10%
Financial assets designated at fair value through profit or loss [member] | Low [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 321,595,000,000 R$ 284,896,000,000
Financial assets designated at fair value through profit or loss [member] | Medium [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating 952,000,000 1,340,000,000
Financial assets designated at fair value through profit or loss [member] | High [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating 382,000,000 410,000,000
Available-for-sale financial assets [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 76,660,000,000 R$ 49,323,000,000
Other financial assets, individually evaluated, classified by rating, percentage 10.00% 6.60%
Available-for-sale financial assets [Member] | Low [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 76,660,000,000 R$ 49,323,000,000
Available-for-sale financial assets [Member] | Medium [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating 0  
Available-for-sale financial assets [Member] | High [Member]    
Disclosure of financial assets individually evaluated classified by rating [Line Items]    
Other financial assets, individually evaluated, classified by rating R$ 0