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Financial Assets at Fair Value Through Profit or Loss - Summary of Financial Assets at Fair Value Through Profit or Loss (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets at fair value through profit or loss [line items]    
Securities pledged as Guarantee of Funding of Financial Institutions and Clients R$ 27,040 R$ 33,848
Brazilian government securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Securities pledged as Guarantee of Funding of Financial Institutions and Clients 9,583 24,988
Brazilian government securities [member] | Held-for-trading financial assets [Member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Securities pledged as Guarantee of Funding of Financial Institutions and Clients 28,759 30,114
Government securities - abroad [member] | Held-for-trading financial assets [Member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Securities pledged as Guarantee of Funding of Financial Institutions and Clients 329 131
Corporate securities [member] | Held-for-trading financial assets [Member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Securities pledged as Guarantee of Funding of Financial Institutions and Clients R$ 29,192 R$ 30,245