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Financial assets at fair value through profit or loss and designated at fair value through profit or loss - Securities (Details) - Financial assets at fair value through profit or loss, classified as held for trading, category [member] - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Cost R$ 571,840 R$ 514,779
Accumulated gain / (loss) reflected in income (12,015) (3,027)
Fair value 559,825 511,752
Government Securities – Other Countries [member]    
IfrsStatementLineItems [Line Items]    
Cost 366,857 340,818
Accumulated gain / (loss) reflected in income (5,161) 1,274
Fair value 361,696 342,092
Government securities - Latin America [member]    
IfrsStatementLineItems [Line Items]    
Cost 4,404 2,854
Accumulated gain / (loss) reflected in income (23) 21
Fair value 4,381 2,875
Government Securities Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Cost 1,490 2,599
Accumulated gain / (loss) reflected in income (17) (37)
Fair value 1,473 2,562
Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Cost 161,447 141,467
Accumulated gain / (loss) reflected in income (6,275) (3,814)
Fair value 155,172 137,653
Corporate Securities [Member] | Negotiable Shares [Member]    
IfrsStatementLineItems [Line Items]    
Cost 27,860 27,844
Accumulated gain / (loss) reflected in income (1,980) (1,309)
Fair value 25,880 26,535
Corporate Securities [Member] | Rural Product Note [member]    
IfrsStatementLineItems [Line Items]    
Cost 972 4,192
Accumulated gain / (loss) reflected in income (31) 11
Fair value 941 4,203
Corporate Securities [Member] | Bank Deposit Certificates [member]    
IfrsStatementLineItems [Line Items]    
Cost 450 128
Fair value 450 128
Corporate Securities [Member] | Real Estate Receivables Certificates [member]    
IfrsStatementLineItems [Line Items]    
Cost 1,754 1,655
Accumulated gain / (loss) reflected in income (100) (64)
Fair value 1,654 1,591
Corporate Securities [Member] | Debentures [member]    
IfrsStatementLineItems [Line Items]    
Cost 91,544 79,026
Accumulated gain / (loss) reflected in income (4,402) (2,478)
Fair value 87,142 76,548
Corporate Securities [Member] | Eurobonds And Others [Member]    
IfrsStatementLineItems [Line Items]    
Cost 2,017 2,460
Accumulated gain / (loss) reflected in income (26) 4
Fair value 1,991 2,464
Corporate Securities [Member] | Financial bills [Member]    
IfrsStatementLineItems [Line Items]    
Cost 33,062 22,552
Accumulated gain / (loss) reflected in income 9  
Fair value 33,071 22,552
Corporate Securities [Member] | Promissory Notes [Member]    
IfrsStatementLineItems [Line Items]    
Cost 1,214 2,611
Accumulated gain / (loss) reflected in income 2 (9)
Fair value 1,216 2,602
Corporate Securities [Member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Cost 2,574 999
Accumulated gain / (loss) reflected in income 253 31
Fair value 2,827 1,030
Investment funds [member]    
IfrsStatementLineItems [Line Items]    
Cost 37,642 27,041
Accumulated gain / (loss) reflected in income (539) (471)
Fair value R$ 37,103 R$ 26,570