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Financial Assets at Fair Value Through Other Comprehensive Income-Securities - Summary of Fair Value and Corresponding Gross Carrying Amount of Financial Assets at Fair Value Through Other Comprehensive Income-Securities Assets (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients R$ 28,967 R$ 27,469
Brazilian government securities [member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients 25,147 26,953
Government securities - abroad [member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients 3,583 37
Corporate securities [member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients R$ 237 R$ 479