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Hedge accounting (Details 5) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
IfrsStatementLineItems [Line Items] |  |
Credit derivative, nominal amount | R$ 356,851 | R$ 282,444
Currency risk [member] |  |
IfrsStatementLineItems [Line Items] |  |
Credit derivative, nominal amount | 19,363 | 19,208
Fair value hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Credit derivative, nominal amount | 101,443 | 54,243
Fair value hedges [member] | Interest rate risk [member] |  |
IfrsStatementLineItems [Line Items] |  |
Credit derivative, nominal amount | 101,443 | 54,243
Hedging instrument, assets | 1,574 | 956
Hedging instrument, liabilities | 737 | 563
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | (267) | (318)
Gain (loss) on hedge ineffectiveness recognised in profit or loss | 3 | 9
Fair value hedges [member] | Interest rate risk [member] | Interest Rate Swap 2 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Credit derivative, nominal amount | 90,201 | 45,430
Hedging instrument, assets | 1,557 | 893
Hedging instrument, liabilities | 737 | 563
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | (328) | (331)
Gain (loss) on hedge ineffectiveness recognised in profit or loss | 8 | 7
Fair value hedges [member] | Interest rate risk [member] | Interest Rate Futures [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Credit derivative, nominal amount | 10,945 | 8,568
Hedging instrument, assets | 17 | 62
Hedging instrument, liabilities |  |
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | 39 | 9
Gain (loss) on hedge ineffectiveness recognised in profit or loss | (5) | 2
Fair value hedges [member] | Currency risk [member] | Interest Rate Futures [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Credit derivative, nominal amount | 297 | 245
Hedging instrument, assets |  | 1
Hedging instrument, liabilities |  |
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | 22 | 4
Gain (loss) on hedge ineffectiveness recognised in profit or loss |  |

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- Definition The nominal amount of a credit derivative. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24G -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24G_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gain (loss) on the change in fair value of the hedging instrument 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 24A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gain (loss) recognised in profit or loss 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
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