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Other assets and liabilities - Summary of Other Assets (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Financial Assets [Line Items]    
Other non-financial assets, Current R$ 12,920 R$ 7,969
Other non-financial assets, Non-current 1,771 1,313
Other non-financial assets, Total 14,691 9,282
Other financial assets, Current 87,498 62,390
Other financial assets, Non-current 7,254 12,700
Other financial assets, Total 94,752 75,090
Receivables from credit card issuers [Member]    
Disclosure of Financial Assets [Line Items]    
Other financial assets, Current 42,395 36,491
Other financial assets, Total 42,395 36,491
Deposits in guarantee for contingent liabilities, provisions and legal obligations [Member]    
Disclosure of Financial Assets [Line Items]    
Other financial assets, Current 7,990 1,455
Other financial assets, Non-current 6,530 12,079
Other financial assets, Total 14,520 13,534
Trading and intermediation of securities [Member]    
Disclosure of Financial Assets [Line Items]    
Other financial assets, Current 26,544 15,400
Other financial assets, Non-current 207 255
Other financial assets, Total 26,751 15,655
Income receivable [member]    
Disclosure of Financial Assets [Line Items]    
Other financial assets, Current 3,236 3,155
Other financial assets, Non-current   5
Other financial assets, Total 3,236 3,160
Credit of operations without credit granting characteristics net amount [member]    
Disclosure of Financial Assets [Line Items]    
Other financial assets, Current 3,612 3,021
Other financial assets, Non-current 5 4
Other financial assets, Total 3,617 3,025
Insurance and reinsurance operations [Member]    
Disclosure of Financial Assets [Line Items]    
Other financial assets, Current 836 899
Other financial assets, Non-current 511 356
Other financial assets, Total 1,347 1,255
Net amount receivables from reimbursement of provisions [member]    
Disclosure of Financial Assets [Line Items]    
Other financial assets, Current 978 999
Other financial assets, Total 978 999
Deposits in guarantee of fund raisings abroad [Member]    
Disclosure of Financial Assets [Line Items]    
Other financial assets, Current 1,864 970
Other financial assets, Non-current 1 1
Other financial assets, Total 1,865 971
Other [Member]    
Disclosure of Financial Assets [Line Items]    
Other financial assets, Current 43  
Other financial assets, Total 43  
Sundry Foreign [Member]    
Disclosure of Financial Assets [Line Items]    
Other non-financial assets, Current 639 995
Other non-financial assets, Non-current 7 9
Other non-financial assets, Total 646 1,004
Prepaid expenses [Member]    
Disclosure of Financial Assets [Line Items]    
Other non-financial assets, Current 3,288 2,642
Other non-financial assets, Non-current 1,038 546
Other non-financial assets, Total 4,326 3,188
Sundry domestic [Member]    
Disclosure of Financial Assets [Line Items]    
Other non-financial assets, Current 2,916 1,579
Other non-financial assets, Non-current 9 27
Other non-financial assets, Total 2,925 1,606
Assets of post-employment benefits plans [member]    
Disclosure of Financial Assets [Line Items]    
Other non-financial assets, Non-current 717 731
Other non-financial assets, Total 717 731
Other non financial assets [Member]    
Disclosure of Financial Assets [Line Items]    
Other non-financial assets, Current 2,269 2,753
Other non-financial assets, Non-current   0
Other non-financial assets, Total 2,269 R$ 2,753
Lease right-of-use [Member]    
Disclosure of Financial Assets [Line Items]    
Other non-financial assets, Current 3,808  
Other non-financial assets, Total R$ 3,808