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Banking service fees - Schedule of Banking Service Fees (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Banking Service Fees [Abstract]      
Fees from credit and debit card services R$ 15,425 R$ 15,394 R$ 14,802
Current account services 10,730 10,017 9,589
Asset management fees 6,332 5,013 4,141
Fees for guarantees issued and credit lines 1,706 1,768 1,783
Collection commissions 1,543 1,506 1,378
Brokerage commission 999 618 606
Other 2,297 2,493 2,149
Total R$ 39,032 R$ 36,809 R$ 34,448