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Hedge accounting (Details 2) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | R$ (2,156) | R$ 684 | R$ (34)
Credit derivative, nominal amount | 356,851 | 282,444 |
Currency risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Hedged item, assets | 23,701 | 18,849 |
Hedged item, liabilities |  |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (17,404) | (13,986) |
Gains (losses) on change in value of foreign currency basis spreads, net of tax | (17,404) | (13,986) |
Credit derivative, nominal amount | 19,363 | 19,208 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | (17,428) | (14,210) |
Hedges of net investment in foreign operations [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (17,404) | (13,986) |
Credit derivative, nominal amount | 19,363 | 19,208 |
Hedges of net investment in foreign operations [member] | Currency risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Hedged item, assets | 23,701 | 18,849 |
Hedged item, liabilities |  |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (17,404) | (13,986) |
Gains (losses) on change in value of foreign currency basis spreads, net of tax | (17,404) | (13,986) |
Credit derivative, nominal amount | 19,363 | 19,208 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | R$ (17,428) | R$ (14,210) |

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gains (losses) recognised in other comprehensive income on change in value of foreign currency basis spreads, net of tax, before reclassification adjustments. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of a hedged item, recognised as an asset. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of a hedged item, recognised as a liability. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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