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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 |

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