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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 |

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