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Fair value (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss R$ 654,194 R$ 568,354
Financial assets at fair value through other comprehensive income 106,303 130,039
Investment funds [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 37,103 26,570
Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through other comprehensive income 103,319 127,531
Level 1 of fair value hierarchy [member] | Country Of Latin America [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through other comprehensive income 275  
Level 1 of fair value hierarchy [member] | Investment funds [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,280 225
Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through other comprehensive income 2,766 2,255
Level 2 of fair value hierarchy [member] | Investment funds [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 35,823 26,345
Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through other comprehensive income 218 253
Financial Assets Designated As At Fair Value Through Profit And Loss [Member]    
IfrsStatementLineItems [Line Items]    
Financial Assets 667,740 643,142
Financial assets at fair value through profit or loss 561,437 513,103
Financial Assets Designated As At Fair Value Through Profit And Loss [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial Assets 535,394 523,741
Financial assets at fair value through profit or loss 432,075 396,210
Financial Assets Designated As At Fair Value Through Profit And Loss [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial Assets 130,188 117,030
Financial assets at fair value through profit or loss 127,422 114,775
Financial Assets Designated As At Fair Value Through Profit And Loss [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial Assets 2,158 2,371
Financial assets at fair value through profit or loss 1,940 2,118
Brazilian Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 361,696 342,092
Financial assets at fair value through other comprehensive income 64,377 83,905
Brazilian Government Securities [member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 358,886 333,539
Financial assets at fair value through other comprehensive income 64,377 83,672
Designated as fair value through profit or loss 43  
Brazilian Government Securities [member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 2,810 8,553
Financial assets at fair value through other comprehensive income   233
Government Securities – Other Countries [member] | Country Of Latin America [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 4,381 2,875
Financial assets at fair value through other comprehensive income 21,470 23,872
Government Securities – Other Countries [member] | Country Of Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,473 2,562
Financial assets at fair value through other comprehensive income 13,026 9,910
Government Securities – Other Countries [member] | Level 1 of fair value hierarchy [member] | Country Of Latin America [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 4,381 2,875
Financial assets at fair value through other comprehensive income 21,470 23,872
Government Securities – Other Countries [member] | Level 1 of fair value hierarchy [member] | Country Of Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,473 2,562
Financial assets at fair value through other comprehensive income 13,026 9,910
Corporates Debt Securities [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 155,172 137,653
Financial assets at fair value through other comprehensive income 7,430 12,352
Corporates Debt Securities [Member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 25,880 26,535
Financial assets at fair value through other comprehensive income 566 6,143
Corporates Debt Securities [Member] | Rural Product Note [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 941 4,203
Financial assets at fair value through other comprehensive income 126  
Corporates Debt Securities [Member] | Bank Deposit Certificates [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 450 128
Financial assets at fair value through other comprehensive income 83 44
Corporates Debt Securities [Member] | Real Estate Receivables Certificates [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,654 1,591
Financial assets at fair value through other comprehensive income 57 67
Corporates Debt Securities [Member] | Debentures [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 87,142 76,548
Financial assets at fair value through other comprehensive income 1,498 1,773
Corporates Debt Securities [Member] | Eurobonds And Others [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,991 2,464
Financial assets at fair value through other comprehensive income 4,812 4,057
Corporates Debt Securities [Member] | Financial Credit Bills [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 33,071 22,552
Financial assets at fair value through other comprehensive income 53  
Corporates Debt Securities [Member] | Promissory Notes [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,216 2,602
Corporates Debt Securities [Member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 2,827 1,030
Corporates Debt Securities [Member] | Other Financial Assets [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,612 1,351
Corporates Debt Securities [Member] | All Other Countries [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through other comprehensive income 235 268
Corporates Debt Securities [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 66,055 57,009
Financial assets at fair value through other comprehensive income 4,446 10,077
Corporates Debt Securities [Member] | Level 1 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 7,659 9,089
Financial assets at fair value through other comprehensive income 509 5,900
Corporates Debt Securities [Member] | Level 1 of fair value hierarchy [member] | Real Estate Receivables Certificates [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 265 197
Corporates Debt Securities [Member] | Level 1 of fair value hierarchy [member] | Debentures [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 55,942 45,070
Financial assets at fair value through other comprehensive income 761 1,045
Corporates Debt Securities [Member] | Level 1 of fair value hierarchy [member] | Eurobonds And Others [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,968 2,459
Financial assets at fair value through other comprehensive income 3,162 3,061
Corporates Debt Securities [Member] | Level 1 of fair value hierarchy [member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 221 194
Corporates Debt Securities [Member] | Level 1 of fair value hierarchy [member] | All Other Countries [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through other comprehensive income 14 71
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 87,177 78,526
Financial assets at fair value through other comprehensive income 2,766 2,022
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 18,115 17,375
Financial assets at fair value through other comprehensive income 57 50
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Rural Product Note [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 941 4,203
Financial assets at fair value through other comprehensive income 126  
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Bank Deposit Certificates [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 450 128
Financial assets at fair value through other comprehensive income 83 44
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Real Estate Receivables Certificates [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,289 1,268
Financial assets at fair value through other comprehensive income 57 67
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Debentures [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 29,466 29,583
Financial assets at fair value through other comprehensive income 519 728
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Eurobonds And Others [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 23  
Financial assets at fair value through other comprehensive income 1,650 936
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Financial Credit Bills [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 33,071 22,548
Financial assets at fair value through other comprehensive income 53  
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Promissory Notes [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,216 2,585
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 2,606 836
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | Other Financial Assets [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,612 1,351
Corporates Debt Securities [Member] | Level 2 of fair value hierarchy [member] | All Other Countries [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through other comprehensive income 221 197
Corporates Debt Securities [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,940 2,118
Financial assets at fair value through other comprehensive income 218 253
Corporates Debt Securities [Member] | Level 3 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 106 71
Financial assets at fair value through other comprehensive income   193
Corporates Debt Securities [Member] | Level 3 of fair value hierarchy [member] | Real Estate Receivables Certificates [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 100 126
Corporates Debt Securities [Member] | Level 3 of fair value hierarchy [member] | Debentures [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 1,734 1,895
Financial assets at fair value through other comprehensive income 218  
Corporates Debt Securities [Member] | Level 3 of fair value hierarchy [member] | Eurobonds And Others [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss   5
Financial assets at fair value through other comprehensive income   60
Corporates Debt Securities [Member] | Level 3 of fair value hierarchy [member] | Financial Credit Bills [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss   4
Corporates Debt Securities [Member] | Level 3 of fair value hierarchy [member] | Promissory Notes [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss   17
Designated Fair Value Profit Or Loss [Member]    
IfrsStatementLineItems [Line Items]    
Designated as fair value through profit or loss 318  
Designated as fair value through profit or loss 43  
Designated as fair value through profit or loss 2,345  
Designated Fair Value Profit Or Loss [Member] | Country Of Latin America [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through other comprehensive income 275  
Designated Fair Value Profit Or Loss [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Designated as fair value through profit or loss 318  
Designated as fair value through profit or loss 2,345  
Financial Liability At Fair Value Through Profit Or Loss [Member] | All Other Countries [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value through profit or loss (862) (856)
Financial Liability At Fair Value Through Profit Or Loss [Member] | Structured Note [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value through profit or loss (318) (296)
Financial Liability At Fair Value Through Profit Or Loss [Member] | Others Financial Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value through profit or loss (544) (560)
Financial Liability At Fair Value Through Profit Or Loss [Member] | Level 2 of fair value hierarchy [member] | All Other Countries [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value through profit or loss (862) (856)
Financial Liability At Fair Value Through Profit Or Loss [Member] | Level 2 of fair value hierarchy [member] | Structured Note [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value through profit or loss (318) (296)
Financial Liability At Fair Value Through Profit Or Loss [Member] | Level 2 of fair value hierarchy [member] | Others Financial Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value through profit or loss R$ (544) R$ (560)