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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

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