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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