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Other assets and liabilities (Details 1) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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IfrsStatementLineItems [Line Items] |  |
Other financial liabilities, Total | R$ 192,951 | R$ 182,348
Other financial liabilities at amortised cost, Total | 192,407 | 181,788
Other financial liabilities at fair value through profit or loss, Total | 544 | 560
Other non-financial liabilities, Total | 55,759 | 41,867
Other financial liabilities, Current | 237,767 | 212,882
Other financial liabilities, Non-current | 10,943 | 11,333
Credit Card Operations [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other financial liabilities at amortised cost, Total | 164,872 | 156,406
Trading And Intermediation Of Securities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other financial liabilities at amortised cost, Total | 18,636 | 15,510
Foreign Exchange Portfolio [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other financial liabilities at amortised cost, Total |  | 2,354
Finance Leases [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other financial liabilities at amortised cost, Total | 3,681 | 3,302
Other Financials Liabilities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other financial liabilities at amortised cost, Total | 5,218 | 4,216
Other financial liabilities at fair value through profit or loss, Total | 544 | 560
Funds In Transit [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | 25,124 | 15,250
Collection And Payment Of Taxes And Contributions [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | 398 | 608
Social And Statutory [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | 12,487 | 10,675
Deferred Income [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | 1,258 | 1,316
Domestic Sundry Creditors [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | 5,076 | 3,435
Personnel Provision [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | 2,731 | 2,386
Provision For Sundry Payments [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | 2,260 | 1,865
Liabilities For Official Agreements And Rendering Of Payment Services [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | 2,433 | 2,035
Provision For Retirement Plan Benefits [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | 2,361 | 2,772
Other Nonfinancial Liabilities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Other non-financial liabilities, Total | R$ 1,631 | R$ 1,525

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