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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, 2021
Dec. 31, 2020
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$ 40,723 R$ 38,119
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 43,500 35,203
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 2,385 2,398
Corporate debt 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$ 778 R$ 518