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Other assets and liabilities - Summary of Other Liabilities (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | R$ 26,275 | R$ 24,931
Other non-financial liabilities, Non-current | 2,063 | 1,079
Other non-financial liabilities, Total | 28,338 | 26,010
Other financial liabilities, Current | 113,024 | 95,639
Other financial liabilities, Non-current | 4,057 | 1,790
Other financial liabilities, Total | 117,081 | 97,429
Credit card operations [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities, Current | 87,361 | 78,803
Other financial liabilities, Total | 87,361 | 78,803
Foreign exchange portfolio [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities, Current | 1,245 | 634
Other financial liabilities, Total | 1,245 | 634
Other financials liabilities [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities, Current | 6,217 | 7,035
Other financial liabilities, Non-current |  | 1,618
Other financial liabilities, Total | 6,217 | 8,653
Funds in transit [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | 10,573 | 10,015
Other non-financial liabilities, Non-current | 11 | 27
Other non-financial liabilities, Total | 10,584 | 10,042
Charging and collection of taxes and similar [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | 335 | 476
Other non-financial liabilities, Total | 335 | 476
Social and statutory [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | 5,057 | 4,085
Other non-financial liabilities, Non-current | 32 | 23
Other non-financial liabilities, Total | 5,089 | 4,108
Deferred income [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | 2,686 | 2,530
Other non-financial liabilities, Total | 2,686 | 2,530
Domestic sundry creditors [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | 2,118 | 2,310
Other non-financial liabilities, Non-current | 79 | 188
Other non-financial liabilities, Total | 2,197 | 2,498
Personnel provision [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | 1,569 | 1,606
Other non-financial liabilities, Non-current | 75 | 63
Other non-financial liabilities, Total | 1,644 | 1,669
Provision for sundry payments [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | 1,761 | 1,670
Other non-financial liabilities, Non-current | 63 | 81
Other non-financial liabilities, Total | 1,824 | 1,751
Obligations on official agreements and rendering of payment services [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | 1,114 | 1,155
Other non-financial liabilities, Total | 1,114 | 1,155
Liabilities from post-employment benefits plans [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Non-current | 1,800 | 697
Other non-financial liabilities, Total | 1,800 | 697
Other non-financial liabilities [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Current | 1,062 | 1,084
Other non-financial liabilities, Non-current | 3 |
Other non-financial liabilities, Total | 1,065 | 1,084
Trading and intermediation of securities [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities, Current | 18,062 | 9,167
Other financial liabilities, Non-current | 65 | 172
Other financial liabilities, Total | 18,127 | R$ 9,339
Finance leases [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities, Current | 139 |
Other financial liabilities, Non-current | 3,992 |
Other financial liabilities, Total | R$ 4,131 |

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