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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Interest Income [Line Items]      
Interest and similar income R$ 117,523 R$ 110,324 R$ 122,703
Central Bank compulsory deposits [member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 4,734 5,063 7,201
Interbank deposits [member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 1,173 1,080 744
Securities purchased under agreements to resell [member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 16,197 17,365 25,711
Financial assets at fair value through other comprehensive income [member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 10,758 9,194 8,886
Financial assets at amortised cost, category [member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 2,582 2,614 3,017
Loans [member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income 81,046 73,640 75,568
Other financial asset [member]      
Disclosure Of Interest Income [Line Items]      
Interest and similar income R$ 1,033 R$ 1,368 R$ 1,576