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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)