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Hedge accounting (Details 1) - 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)
Currency risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 19,363 19,208  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (17,404) (13,986)  
Cash flow hedges [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 236,045 208,993  
Hedging instrument, assets 220 276  
Hedging instrument, liabilities 311 427  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness (1,066) 175  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (1,122) 176  
Gain (loss) on hedge ineffectiveness recognised in profit or loss 56 (1)  
Reclassification adjustments on cash flow hedges, net of tax (347) (174)  
Interest Rate Futures [Member] | Cash flow hedges [member] | Interest rate risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 172,904 170,514  
Hedging instrument, assets 76 53  
Hedging instrument, liabilities 133 43  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness (855) 42  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (911) 42  
Gain (loss) on hedge ineffectiveness recognised in profit or loss 56  
Reclassification adjustments on cash flow hedges, net of tax (285) (168)  
Interest Rate Forward [Member] | Cash flow hedges [member] | Interest rate risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 33,218 10,582  
Hedging instrument, assets 44  
Hedging instrument, liabilities 132  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness (45) 21  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (45) 21  
Reclassification adjustments on cash flow hedges, net of tax 4  
Interest Rate Swap 2 [Member] | Cash flow hedges [member] | Interest rate risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 27,321 24,286  
Hedging instrument, assets 106 179  
Hedging instrument, liabilities 31 101  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness 38 89  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income 38 90  
Gain (loss) on hedge ineffectiveness recognised in profit or loss (1)  
Reclassification adjustments on cash flow hedges, net of tax (59) (1)  
Futures contract [member] | Cash flow hedges [member] | Currency risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 1,186 1,278  
Hedging instrument, assets 4  
Hedging instrument, liabilities 7  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness (181) 36  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (181) 36  
Reclassification adjustments on cash flow hedges, net of tax (3) (9)  
Forward contract [member] | Cash flow hedges [member] | Currency risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 1,416 2,333  
Hedging instrument, assets 34  
Hedging instrument, liabilities 15 276  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness (23) (13)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income R$ (23) R$ (13)