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Other assets and liabilities - Summary of Other Assets (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of Financial Assets [Line Items]      
Other non-financial assets, Current R$ 7,969 R$ 9,373  
Other non-financial assets, Non-current 1,313 1,820  
Other non-financial assets, Total 9,282 11,193  
Other financial assets, Current 62,390 46,718  
Other financial assets, Non-current 12,700 12,850  
Other financial assets, Total 75,090 59,568 R$ 53,895
Receivables from credit card issuers [Member]      
Disclosure of Financial Assets [Line Items]      
Other financial assets, Current 36,491 32,073  
Other financial assets, Total 36,491 32,073  
Deposits in guarantee for contingent, provisions and legal obligations [member]      
Disclosure of Financial Assets [Line Items]      
Other financial assets, Current 1,455 1,520  
Other financial assets, Non-current 12,079 11,892  
Other financial assets, Total 13,534 13,412  
Negotiation and intermediation of securities [Member]      
Disclosure of Financial Assets [Line Items]      
Other financial assets, Current 15,400 6,202  
Other financial assets, Non-current 255 18  
Other financial assets, Total 15,655 6,220  
Income receivable [member]      
Disclosure of Financial Assets [Line Items]      
Other financial assets, Current 3,155 2,843  
Other financial assets, Non-current 5 106  
Other financial assets, Total 3,160 2,949  
Credit of operations without credit granting characteristics net amount [member]      
Disclosure of Financial Assets [Line Items]      
Other financial assets, Current 3,021 1,973  
Other financial assets, Non-current 4 3  
Other financial assets, Total 3,025 1,976  
Insurance and reinsurance operations [Member]      
Disclosure of Financial Assets [Line Items]      
Other financial assets, Current 899 1,224  
Other financial assets, Non-current 356 10  
Other financial assets, Total 1,255 1,234  
Net amount receivables from reimbursement of provisions [member]      
Disclosure of Financial Assets [Line Items]      
Other financial assets, Current 999 244  
Other financial assets, Non-current   821  
Other financial assets, Total 999 1,065  
Deposits in guarantee for foreign borrowing program [Member]      
Disclosure of Financial Assets [Line Items]      
Other financial assets, Current 970 639  
Other financial assets, Non-current 1    
Other financial assets, Total 971 639  
Sundry Foreign [Member]      
Disclosure of Financial Assets [Line Items]      
Other non-financial assets, Current 995 1,847  
Other non-financial assets, Non-current 9 29  
Other non-financial assets, Total 1,004 1,876  
Prepaid expenses [Member]      
Disclosure of Financial Assets [Line Items]      
Other non-financial assets, Current 2,642 2,432  
Other non-financial assets, Non-current 546 643  
Other non-financial assets, Total 3,188 3,075  
Sundry domestic [Member]      
Disclosure of Financial Assets [Line Items]      
Other non-financial assets, Current 1,579 2,882  
Other non-financial assets, Non-current 27 77  
Other non-financial assets, Total 1,606 2,959  
Plan assets postemployment benefits [member]      
Disclosure of Financial Assets [Line Items]      
Other non-financial assets, Non-current 731 1,067  
Other non-financial assets, Total 731 1,067  
Other non financial assets [Member]      
Disclosure of Financial Assets [Line Items]      
Other non-financial assets, Current 2,753 2,212  
Other non-financial assets, Non-current   4  
Other non-financial assets, Total R$ 2,753 R$ 2,216