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Other assets and liabilities - Summary of Other Assets (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of Financial Assets [Line Items] |  |
Other financial assets | R$ 96,630 | R$ 93,261
Other financial assets, Current | 93,604 | 89,632
Other financial assets, Non-current | 19,520 | 19,402
Other financial assets at amortised cost | 96,473 | 93,255
Other financial assets at fair value through profit or loss | 157 | 6
Other non-financial assets | 16,494 | 15,773
Receivables from credit card issuers [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 53,968 | 43,511
Deposits in guarantee for contingent liabilities, provisions and legal obligations [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 12,264 | 12,693
Trading and intermediation of securities [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 17,218 | 28,254
Income receivable [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 3,839 | 2,979
Operations without credit granting characteristics, net of provisions [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 4,720 | 3,476
Insurance and reinsurance operations [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 1,565 | 1,322
Net amount receivables from reimbursement of provisions [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 888 | 919
Deposits in guarantee of fund raisings abroad [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 660 | 101
Foreign Exchange Portfolio [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 1,213 |
Sundry Foreign [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other non-financial assets | 621 | 717
Prepaid expenses [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other non-financial assets | 5,243 | 4,404
Sundry domestic [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other non-financial assets | 2,868 | 2,555
Assets of post-employment benefit plans [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other non-financial assets | 493 | 585
Lease right-of-use [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other non-financial assets | 5,046 | 4,908
Other [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Other financial assets at amortised cost | 138 |
Other financial assets at fair value through profit or loss | 157 | 6
Other non-financial assets | R$ 2,223 | R$ 2,604

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