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Interest and similar income and expense and net gain (loss) on investment securities and derivatives - Additional Information (Detail)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Disclosure of financial assets and liabilities measured at fair value [Line Items]  
Financial assets, expense recognized on expected losses R$ 1,535
Financial assets at fair value through other comprehensive income [Member]  
Disclosure of financial assets and liabilities measured at fair value [Line Items]  
Total loss, net of reversals (1)
Financial assets at amortised cost, class [Member]  
Disclosure of financial assets and liabilities measured at fair value [Line Items]  
Total loss, net of reversals R$ 1,536