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Hedge accounting (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Nominal Value R$ 356,851 R$ 282,444  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (2,156) 684 R$ (34)
Hedges of net investment in foreign operations [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 19,363 19,208  
Hedging instrument, assets 6,640 5,655  
Hedging instrument, liabilities 2,068 407  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectivenes (17,428) (14,210)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (17,404) (13,986)  
Gain (loss) on hedge ineffectiveness recognised in profit or loss (24) (224)  
Reclassification adjustments on cash flow hedges, net of tax (1) 32  
Ddi Futures Contracts [Member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 5,234 2,109  
Hedging instrument, assets 21 10  
Hedging instrument, liabilities  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectivenes (6,093) (5,638)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (6,053) (5,596)  
Gain (loss) on hedge ineffectiveness recognised in profit or loss (40) (42)  
Reclassification adjustments on cash flow hedges, net of tax 136  
Non Deliverable Forward Contract [Member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 7,933 12,539  
Hedging instrument, assets 129 120  
Hedging instrument, liabilities 107 57  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectivenes (2,640) (4,951)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (2,610) (4,733)  
Gain (loss) on hedge ineffectiveness recognised in profit or loss (30) (218)  
Reclassification adjustments on cash flow hedges, net of tax (1) (104)  
Financial Assets Held For Hedging [Member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 6,196 4,560  
Hedging instrument, assets 6,490 5,525  
Hedging instrument, liabilities 1,961 350  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectivenes (8,695) (3,621)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (8,741) (3,657)  
Gain (loss) on hedge ineffectiveness recognised in profit or loss 46 36  
Reclassification adjustments on cash flow hedges, net of tax