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Hedge accounting (Details 7) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount R$ 356,851 R$ 282,444
Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 101,443 54,243
Fair value hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 25,287 16,304
Cash flow hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 236,045 208,993
Cash flow hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 10,900 8,187
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 178,283 146,558
Not later than one year [member] | Fair value hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 12,942 6,133
Not later than one year [member] | Cash flow hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 9,404 2,288
Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 92,728 55,650
Later than one year and not later than two years [member] | Fair value hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 3,574 2,575
Later than one year and not later than two years [member] | Cash flow hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 504 2,008
Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 38,521 31,336
Later than two years and not later than three years [member] | Fair value hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 535 1,048
Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 19,028 23,937
Later than three years and not later than four years [member] | Fair value hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,556 532
Later than three years and not later than four years [member] | Cash flow hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 126 678
Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 14,967 12,087
Later than four years and not later than five years [member] | Fair value hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 2,930 734
Later than four years and not later than five years [member] | Cash flow hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 415 2,833
Later than five years and not later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 11,115 11,793
Later than five years and not later than ten years [member] | Fair value hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 3,328 4,979
Later than five years and not later than ten years [member] | Cash flow hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 451 380
Later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 2,209 1,083
Later than ten years [member] | Fair value hedges [member] | Hedge Of Loan Operations [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 280  
Later than ten years [member] | Fair value hedges [member] | Hedge fund investments [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 422 303
Hedge Of Deposits And Repurchase Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 107,677 120,550
Hedge Of Deposits And Repurchase Agreements [Member] | Cash flow hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 10,910 18,265
Hedge Of Deposits And Repurchase Agreements [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 67,617 78,786
Hedge Of Deposits And Repurchase Agreements [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 27,835 17,167
Hedge Of Deposits And Repurchase Agreements [Member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 9,146 12,556
Hedge Of Deposits And Repurchase Agreements [Member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,467 8,672
Hedge Of Deposits And Repurchase Agreements [Member] | Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,174 1,562
Hedge Of Deposits And Repurchase Agreements [Member] | Later than five years and not later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 438 1,807
Hedge Of Highly Probable Forecast Transactions [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,437 1,323
Hedge Of Highly Probable Forecast Transactions [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,437 1,323
Hedges of net investment in foreign operations [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 19,363 19,208
Hedges of net investment in foreign operations [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 19,363 19,208
Hedge Of Loan Operations [Member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 37,116 12,589
Hedge Of Loan Operations [Member] | Cash flow hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 10,910 18,265
Hedge Of Loan Operations [Member] | Not later than one year [member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 8,227 2,230
Hedge Of Loan Operations [Member] | Not later than one year [member] | Cash flow hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 7,310 10,353
Hedge Of Loan Operations [Member] | Later than one year and not later than two years [member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 12,446 2,173
Hedge Of Loan Operations [Member] | Later than one year and not later than two years [member] | Cash flow hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,148 5,376
Hedge Of Loan Operations [Member] | Later than two years and not later than three years [member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 6,090 3,114
Hedge Of Loan Operations [Member] | Later than two years and not later than three years [member] | Cash flow hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 746 1,280
Hedge Of Loan Operations [Member] | Later than three years and not later than four years [member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 4,334 1,577
Hedge Of Loan Operations [Member] | Later than three years and not later than four years [member] | Cash flow hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,272  
Hedge Of Loan Operations [Member] | Later than four years and not later than five years [member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 4,092 2,523
Hedge Of Loan Operations [Member] | Later than four years and not later than five years [member] | Cash flow hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 434 1,256
Hedge Of Loan Operations [Member] | Later than five years and not later than ten years [member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,647 972
Hedge Of Assets Transactions [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,966 7,394
Hedge Of Assets Transactions [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 7,394
Hedge Of Assets Transactions [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount  
Hedge Of Assets Transactions [Member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,247  
Hedge Of Assets Transactions [Member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 719  
Hedge Of Asset Backed Securities Under Repurchase Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 63,261 42,570
Hedge Of Asset Backed Securities Under Repurchase Agreements [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 22,629
Hedge Of Asset Backed Securities Under Repurchase Agreements [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 15,489 20,813
Hedge Of Asset Backed Securities Under Repurchase Agreements [Member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 17,016 10,624
Hedge Of Asset Backed Securities Under Repurchase Agreements [Member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 5,170 11,133
Hedge Of Asset Backed Securities Under Repurchase Agreements [Member] | Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 2,957  
Hedge Of Assets Denominated In U F [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 39,894 10,704
Hedge Of Assets Denominated In U F [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 16,801 10,704
Hedge Of Assets Denominated In U F [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 23,093  
Hedge Of Securities [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 38,743 25,105
Hedge Of Securities [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 12,256 7,894
Hedge Of Securities [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 8,639 5,538
Hedge Of Securities [Member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 3,741 2,714
Hedge Of Securities [Member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 4,384 1,345
Hedge Of Securities [Member] | Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 2,965 3,179
Hedge Of Securities [Member] | Later than five years and not later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 5,251 3,655
Hedge Of Securities [Member] | Later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 1,507 780
Hedge Of Firm Commitments Fair Value [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 297  
Hedge Of Firm Commitments Fair Value [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount 297  
Hedge Of Firm Commitments [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount R$ 297 245
Hedge Of Firm Commitments [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount   R$ 245