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Hedge accounting (Details 6) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | R$ 356,851 | R$ 282,444
Financial instruments designated as hedging instruments, at fair value | 5,318 | 5,490
Fair value hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 101,443 | 54,243
Fair value hedges [member] | Hedge fund investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 25,287 | 16,304
Financial instruments designated as hedging instruments, at fair value | (294) | (299)
Book value | 25,287 | 16,304
Cash flow hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 236,045 | 208,993
Cash flow hedges [member] | Hedge fund investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 10,900 | 8,187
Financial instruments designated as hedging instruments, at fair value | 82 | (328)
Book value | 10,908 | 8,293
Hedge Of Deposits And Repurchase Agreements [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 107,677 | 120,550
Financial instruments designated as hedging instruments, at fair value | 76 | 53
Book value | 110,405 | 119,464
Hedge Of Deposits And Repurchase Agreements [Member] | Cash flow hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 10,910 | 18,265
Financial instruments designated as hedging instruments, at fair value | 54 | 130
Book value | 10,955 | 18,449
Hedge Of Highly Probable Forecast Transactions [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 1,437 | 1,323
Financial instruments designated as hedging instruments, at fair value | (11) | (8)
Book value | 1,606 | 1,287
Hedges of net investment in foreign operations [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 19,363 | 19,208
Financial instruments designated as hedging instruments, at fair value | 4,572 | 5,248
Book value | 23,701 | 18,849
Hedge Of Loan Operations [Member] | Fair value hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 37,116 | 12,589
Financial instruments designated as hedging instruments, at fair value | 333 | 430
Book value | 37,116 | 12,592
Hedge Of Loan Operations [Member] | Cash flow hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 10,910 | 18,265
Hedge Of Assets Transactions [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 1,966 | 7,394
Financial instruments designated as hedging instruments, at fair value | (10) |
Book value | 2,420 | 7,395
Hedge Of Asset Backed Securities Under Repurchase Agreements [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 63,261 | 42,570
Financial instruments designated as hedging instruments, at fair value | (123) | (43)
Book value | 66,795 | 41,761
Hedge Of Assets Denominated In U F [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 39,894 | 10,704
Financial instruments designated as hedging instruments, at fair value | (159) | 45
Book value | 39,842 | 10,664
Hedge Of Securities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 38,743 | 25,105
Financial instruments designated as hedging instruments, at fair value | 798 | 261
Book value | 38,527 | 25,179
Hedge Of Firm Commitments [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, nominal amount | 297 | 245
Financial instruments designated as hedging instruments, at fair value |  | 1
Book value | R$ 90 | R$ 265

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