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Other assets and liabilities - Summary of Other Liabilities (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | R$ 42,130 | R$ 38,511
Other financial liabilities, Current | 167,789 | 147,993
Other financial liabilities, Non-current | 8,608 | 9,447
Other financial liabilities, Total | 134,267 | 118,929
Other financial liabilities at amortised cost, Total | 134,106 | 118,924
Other financial liabilities at fair value through profit or loss, Total | 157 | 6
Credit card operations [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities at amortised cost, Total | 108,997 | 92,580
Trading and intermediation of securities [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities at amortised cost, Total | 12,161 | 15,121
Foreign exchange portfolio [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities at amortised cost, Total | 2,485 | 859
Finance leases [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities at amortised cost, Total | 5,324 | 5,069
Other financials liabilities [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial liabilities at amortised cost, Total | 5,139 | 5,295
Other financial liabilities at fair value through profit or loss, Total | 161 | 5
Funds in transit [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | 18,027 | 16,071
Charging and collection of taxes and similar [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | 457 | 339
Social and statutory [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | 7,853 | 6,759
Deferred income [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | 3,278 | 3,201
Domestic sundry creditors [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | 3,183 | 3,023
Personnel provision [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | 2,244 | 1,900
Provision for sundry payments [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | 2,348 | 2,576
Obligations on official agreements and rendering of payment services [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | 1,261 | 1,326
Liabilities from post-employment benefit plans [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | 2,209 | 2,083
Other non-financial liabilities [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other non-financial liabilities, Total | R$ 1,270 | R$ 1,233

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