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Financial assets at fair value through other comprehensive income - Securities (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Cost R$ 111,464 R$ 131,493
Fair value adjustments (in stockholders' equity) (4,904) (1,287)
Expected loss (257) (167)
Fair value 106,303 130,039
Brazilian Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Cost 67,954 84,567
Fair value adjustments (in stockholders' equity) (3,577) (662)
Expected loss
Fair value 64,377 83,905
Brazilian Government Securities [member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Cost 36 36
Expected loss (36) (36)
Government Securities – Other Countries [member]    
IfrsStatementLineItems [Line Items]    
Cost 13,072 9,923
Fair value adjustments (in stockholders' equity) (46) (12)
Expected loss (1)
Fair value 13,026 9,910
Government Securities – Other Countries [member] | Country Of Latin America [Member]    
IfrsStatementLineItems [Line Items]    
Cost 21,421 23,715
Fair value adjustments (in stockholders' equity) 56 158
Expected loss (7) (1)
Fair value 21,470 23,872
Corporate Debt Securitie [Member]    
IfrsStatementLineItems [Line Items]    
Cost 8,981 13,252
Fair value adjustments (in stockholders' equity) (1,337) (771)
Expected loss (214) (129)
Fair value 7,430 12,352
Corporate Debt Securitie [Member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Cost 234 265
Fair value adjustments (in stockholders' equity) 5 6
Expected loss (4) (3)
Fair value 235 268
Corporate Debt Securitie [Member] | Shares [Member]    
IfrsStatementLineItems [Line Items]    
Cost 1,762 6,960
Fair value adjustments (in stockholders' equity) (1,196) (817)
Fair value 566 6,143
Corporate Debt Securitie [Member] | Rural Product Note [member]    
IfrsStatementLineItems [Line Items]    
Cost 127  
Fair value adjustments (in stockholders' equity) (1)  
Fair value 126  
Corporate Debt Securitie [Member] | Bank Deposit Certificates [member]    
IfrsStatementLineItems [Line Items]    
Cost 82 44
Fair value adjustments (in stockholders' equity) 1 1
Expected loss   (1)
Fair value 83 44
Corporate Debt Securitie [Member] | Real Estate Receivables Certificates [member]    
IfrsStatementLineItems [Line Items]    
Cost 60 65
Fair value adjustments (in stockholders' equity) (3) 2
Fair value 57 67
Corporate Debt Securitie [Member] | Debentures [member]    
IfrsStatementLineItems [Line Items]    
Cost 1,708 1,837
Fair value adjustments (in stockholders' equity) (38) 21
Expected loss (172) (85)
Fair value 1,498 1,773
Corporate Debt Securitie [Member] | Eurobonds And Others [Member]    
IfrsStatementLineItems [Line Items]    
Cost 4,957 4,081
Fair value adjustments (in stockholders' equity) (107) 16
Expected loss (38) (40)
Fair value 4,812 R$ 4,057
Corporate Debt Securitie [Member] | Financial bills [Member]    
IfrsStatementLineItems [Line Items]    
Cost 51  
Fair value adjustments (in stockholders' equity) 2  
Fair value R$ 53