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Interest and similar income and expense and net gain (loss) on investment securities and derivatives - Summary of Interest, Similar Income of Financial Assets at Amortized Cost and at Fair Value Through Other Comprehensive Income (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Interest Income [Line Items]      
Interest and similar income R$ 110,324 R$ 122,703 R$ 138,764
Central Bank compulsory deposits [Member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 5,063 7,201 6,920
Interbank deposits [Member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 1,080 744 674
Securities purchased under agreements to resell [Member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 17,365 25,711 34,162
Financial assets at fair value through other comprehensive income [Member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 9,194 8,886 11,160
Financial assets at amortised cost, category [member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 2,614 3,017 3,822
Loan and lease operations [Member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 73,640 75,568 80,124
Other financial asset [Member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income R$ 1,368 R$ 1,576 R$ 1,902