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Financial assets at fair value through other comprehensive income - Securities (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Gains / (Losses) R$ (3,905) R$ (612) R$ (1,534)
Level 1 of fair value hierarchy [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (117) (114)  
Gains / (Losses) (41) (44)  
Purchases (2) (5)  
Settlements 10 17  
Transfer to stage 2 55 38  
Cure from stage 2 (21) (17)  
Expected loss, ending balance (116) (117) (114)
Transfer to stage 3   8  
Level 1 of fair value hierarchy [member] | Brazilian Government Securities [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (36) (36)  
Expected loss, ending balance (36) (36) (36)
Level 1 of fair value hierarchy [member] | Brazilian Government Securities [member] | Other [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (36) (36)  
Expected loss, ending balance (36) (36) (36)
Level 1 of fair value hierarchy [member] | Government securities - Latin America [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (1) (1)  
Gains / (Losses) (6) (2)  
Transfer to stage 2   7  
Cure from stage 2   (5)  
Expected loss, ending balance (7) (1) (1)
Level 1 of fair value hierarchy [member] | Government Securities – Other Countries [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (1)  
Gains / (Losses) 1 (1)  
Expected loss, ending balance (1)
Level 1 of fair value hierarchy [member] | Corporate Securities [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (79) (77)  
Gains / (Losses) (36) (41)  
Purchases (2) (5)  
Settlements 10 17  
Transfer to stage 2 55 31  
Cure from stage 2 (21) (12)  
Expected loss, ending balance (73) (79) (77)
Transfer to stage 3   8  
Level 1 of fair value hierarchy [member] | Corporate Securities [Member] | Other [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (3) (4)  
Gains / (Losses) (1)    
Settlements   1  
Expected loss, ending balance (4) (3) (4)
Level 1 of fair value hierarchy [member] | Corporate Securities [Member] | Debentures [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (46) (45)  
Gains / (Losses) (43) (17)  
Purchases   (2)  
Settlements 5 4  
Transfer to stage 2 54 14  
Cure from stage 2 (15)    
Expected loss, ending balance (45) (46) (45)
Level 1 of fair value hierarchy [member] | Corporate Securities [Member] | Eurobonds And Other [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (30) (27)  
Gains / (Losses) 8 (12)  
Purchases (2) (2)  
Settlements 5 6  
Transfer to stage 2 1 17  
Cure from stage 2 (6) (12)  
Expected loss, ending balance (24) (30) (27)
Level 1 of fair value hierarchy [member] | Corporate Securities [Member] | Bank Deposit Certificate [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance  
Gains / (Losses)   (12)  
Purchases   (1)  
Settlements   5  
Expected loss, ending balance  
Transfer to stage 3   8  
Level 1 of fair value hierarchy [member] | Corporate Securities [Member] | Rural Product Note [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (1)  
Settlements   1  
Expected loss, ending balance   (1)
Level 2 of fair value hierarchy [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (24)  
Gains / (Losses) (83) (25)  
Purchases (41) (8)  
Settlements 55 4  
Expected loss, ending balance (127) (24)
Cure to stage 1 21 17  
Transfer from stage 1 (55) (38)  
Transfer to stage 3   26  
Level 2 of fair value hierarchy [member] | Government securities - Latin America [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance  
Settlements   2  
Expected loss, ending balance  
Cure to stage 1   5  
Transfer from stage 1   (7)  
Level 2 of fair value hierarchy [member] | Corporate Securities [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (24)  
Gains / (Losses) (83) (25)  
Purchases (41) (8)  
Settlements 55 2  
Expected loss, ending balance (127) (24)
Cure to stage 1 21 12  
Transfer from stage 1 (55) (31)  
Transfer to stage 3   26  
Level 2 of fair value hierarchy [member] | Corporate Securities [Member] | Debentures [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (13)  
Gains / (Losses) (86) (25)  
Purchases (24)    
Settlements 49    
Expected loss, ending balance (113) (13)
Cure to stage 1 15    
Transfer from stage 1 (54) (14)  
Transfer to stage 3   26  
Level 2 of fair value hierarchy [member] | Corporate Securities [Member] | Eurobonds And Other [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (10)  
Gains / (Losses) 2 1  
Purchases (17) (8)  
Settlements 6 2  
Expected loss, ending balance (14) (10)
Cure to stage 1 6 12  
Transfer from stage 1 (1) (17)  
Level 2 of fair value hierarchy [member] | Corporate Securities [Member] | Bank Deposit Certificate [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (1)  
Gains / (Losses) 1 (1)  
Expected loss, ending balance   (1)
Level 3 of fair value hierarchy [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (26)  
Gains / (Losses) (14)    
Settlements 26 8  
Expected loss, ending balance (14) (26)
Transfer from stage 1   (8)  
Transfer from stage 2   (26)  
Level 3 of fair value hierarchy [member] | Corporate Securities [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (26)  
Gains / (Losses) (14)    
Settlements 26 8  
Expected loss, ending balance (14) (26)
Transfer from stage 1   (8)  
Transfer from stage 2   (26)  
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Debentures [member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance (26)  
Gains / (Losses) (14)    
Settlements 26    
Expected loss, ending balance (14) (26)
Transfer from stage 2   (26)  
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Bank Deposit Certificate [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss, beginning balance  
Settlements   8  
Expected loss, ending balance  
Transfer from stage 1   R$ (8)