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Financial assets at fair value through other comprehensive income - Securities (Details 1) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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IfrsStatementLineItems [Line Items] |  |
Gross carrying amount | R$ 41,123 | R$ 49,545
Current Fair value | 39,877 | 48,643
Non-current gross carrying amount | 70,341 | 81,948
Non-current fair value | 66,426 | 81,396
Gross carrying amount | 111,464 | 131,493
Fair value | 106,303 | 130,039
Nonstated Maturity [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Gross carrying amount | 1,762 | 6,960
Current Fair value | 566 | 6,143
Not later than one year [member] |  |
IfrsStatementLineItems [Line Items] |  |
Gross carrying amount | 39,361 | 42,585
Current Fair value | 39,311 | 42,500
Later than one year and not later than five years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Non-current gross carrying amount | 49,121 | 56,984
Non-current fair value | 47,809 | 56,886
Later than five years and not later than ten years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Non-current gross carrying amount | 11,201 | 14,518
Non-current fair value | 10,803 | 14,585
Later than ten years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Non-current gross carrying amount | 10,019 | 10,446
Non-current fair value | R$ 7,814 | R$ 9,925

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- Definition The amount of current financial assets at fair value through other comprehensive income. [Refer: Financial assets at fair value through other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_h&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of non-current financial assets at fair value through other comprehensive income. [Refer: Financial assets at fair value through other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_h&doctype=Standard -URIDate 2024-03-27 + Details
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