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Interest and similar income and expense and net gain (loss) on investment securities and derivatives - Summary of Interest and Similar Expense (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Interest Expense [Line items]
Interest and similar expense	R$ (70,612)	R$ (78,330)	R$ (95,129)
Bank Deposits [Member]
Disclosure Of Interest Expense [Line items]
Interest and similar expense	(17,484)	(13,340)	(14,701)
Securities sold under repurchase agreements [member]
Disclosure Of Interest Expense [Line items]
Interest and similar expense	(20,889)	(33,087)	(45,935)
Inter bank market debt [Member]
Disclosure Of Interest Expense [Line items]
Interest and similar expense	(13,587)	(10,059)	(8,347)
Institutional market debt [Member]
Disclosure Of Interest Expense [Line items]
Interest and similar expense	(6,773)	(6,852)	(8,249)
Finance Expense [Member]
Disclosure Of Interest Expense [Line items]
Interest and similar expense	(11,815)	(14,918)	(17,790)
Other interest and similar expense [Member]
Disclosure Of Interest Expense [Line items]
Interest and similar expense	R$ (64)	R$ (74)	R$ (107)