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Hedge accounting (Details) - 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 |
Hedge Of Deposits And Repurchase Agreements [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit derivative, nominal amount | 107,677 | 120,550 |
Hedge Of Assets Transactions [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit derivative, nominal amount | 1,966 | 7,394 |
Hedge Of Asset Backed Securities Under Repurchase Agreements [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit derivative, nominal amount | 63,261 | 42,570 |
Hedge Of Assets Denominated In U F [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit derivative, nominal amount | 39,894 | 10,704 |
Hedge Of Highly Probable Forecast Transactions [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit derivative, nominal amount | 1,437 | 1,323 |
Cash flow hedges [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Hedged item, liabilities | 122,919 | 129,044 |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (1,122) | 176 |
Increase Decrease In Cash Flow Hedge Reserve | (1,069) | 9 |
Credit derivative, nominal amount | 236,045 | 208,993 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | (1,066) | 175 |
Hedged item, assets | 120,012 | 78,269 |
Cash flow hedges [member] | Hedge Of Deposits And Repurchase Agreements [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit derivative, nominal amount | 10,910 | 18,265 |
Cash flow hedges [member] | Hedge Of Loan Operations [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit derivative, nominal amount | 10,910 | 18,265 |
Interest rate risk [member] | Cash flow hedges [member] | Hedge Of Deposits And Repurchase Agreements [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Hedged item, liabilities | 110,405 | 119,464 |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | 2,672 | (1,086) |
Increase Decrease In Cash Flow Hedge Reserve | 2,672 | (1,070) |
Credit derivative, nominal amount | 107,677 | 120,550 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | 2,728 | (1,086) |
Interest rate risk [member] | Cash flow hedges [member] | Hedge Of Assets Transactions [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (155) | (4) |
Increase Decrease In Cash Flow Hedge Reserve | (155) | (4) |
Credit derivative, nominal amount | 1,966 | 7,394 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | (155) | (4) |
Hedged item, assets | 2,420 | 7,395 |
Interest rate risk [member] | Cash flow hedges [member] | Hedge Of Asset Backed Securities Under Repurchase Agreements [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (3,428) | 1,132 |
Increase Decrease In Cash Flow Hedge Reserve | (3,429) | 830 |
Credit derivative, nominal amount | 63,261 | 42,570 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | (3,428) | 1,132 |
Hedged item, assets | 66,795 | 41,761 |
Interest rate risk [member] | Cash flow hedges [member] | Hedge Of Loan Operations [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | 44 | 185 |
Increase Decrease In Cash Flow Hedge Reserve | 59 | 211 |
Credit derivative, nominal amount | 10,910 | 18,265 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | 44 | 184 |
Hedged item, assets | 10,955 | 18,449 |
Interest rate risk [member] | Cash flow hedges [member] | Hedge fund investments [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Hedged item, liabilities | 9,732 | 5,993 |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | 3 | (95) |
Increase Decrease In Cash Flow Hedge Reserve | (61) | (162) |
Credit derivative, nominal amount | 9,735 | 5,899 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | 3 | (95) |
Interest rate risk [member] | Cash flow hedges [member] | Hedge Of Assets Denominated In U F [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (54) | 21 |
Increase Decrease In Cash Flow Hedge Reserve | (54) | 21 |
Credit derivative, nominal amount | 39,894 | 10,704 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | (54) | 21 |
Hedged item, assets | 39,842 | 10,664 |
Interest rate risk [member] | Cash flow hedges [member] | Hedge Of Highly Probable Forecast Transactions [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Hedged item, liabilities | 1,606 | 1,287 |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (193) | 35 |
Increase Decrease In Cash Flow Hedge Reserve | (90) | 195 |
Credit derivative, nominal amount | 1,437 | 1,323 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | (193) | 35 |
Interest rate risk [member] | Cash flow hedges [member] | Hedge Of Funding [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Hedged item, liabilities | 1,176 | 2,300 |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (11) | (12) |
Increase Decrease In Cash Flow Hedge Reserve | (11) | (12) |
Credit derivative, nominal amount | 1,165 | 2,288 |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness | R$ (11) | R$ (12) |

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