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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)