v3.26.1
Hedge accounting - Schedule Of Hedge Instruments (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Notional amount R$ 414,431 R$ 356,851  
Variation in value recognized in other comprehensive income 1,002 (2,156) R$ 684
Cash flow hedge      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Notional amount 240,699 236,045  
Book value, assets 141 220  
Book value, liabilities 253 311  
Variation in fair value used to calculate hedge ineffectiveness (332) (1,066)  
Variation in value recognized in other comprehensive income (332) (1,122)  
Hedge ineffectiveness recognized in income 0 56  
Amount reclassified from cash flow hedge reserve to income (165) (347)  
Futures | Interest rate risk | Cash flow hedge      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Notional amount 102,324 172,904  
Book value, assets 0 76  
Book value, liabilities 0 133  
Variation in fair value used to calculate hedge ineffectiveness (450) (855)  
Variation in value recognized in other comprehensive income (450) (911)  
Hedge ineffectiveness recognized in income 0 56  
Amount reclassified from cash flow hedge reserve to income (152) (285)  
Forward | Interest rate risk | Cash flow hedge      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Notional amount 72,802 33,218  
Book value, assets 0 0  
Book value, liabilities 110 132  
Variation in fair value used to calculate hedge ineffectiveness 50 (45)  
Variation in value recognized in other comprehensive income 50 (45)  
Hedge ineffectiveness recognized in income 0 0  
Amount reclassified from cash flow hedge reserve to income (29) 0  
Swaps | Interest rate risk | Cash flow hedge      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Notional amount 62,545 27,321  
Book value, assets 141 106  
Book value, liabilities 69 31  
Variation in fair value used to calculate hedge ineffectiveness 21 38  
Variation in value recognized in other comprehensive income 21 38  
Hedge ineffectiveness recognized in income 0 0  
Amount reclassified from cash flow hedge reserve to income 18 (59)  
Futures | Foreign exchange risk | Cash flow hedge      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Notional amount 834 1,186  
Book value, assets 0 4  
Book value, liabilities 0 0  
Variation in fair value used to calculate hedge ineffectiveness 23 (181)  
Variation in value recognized in other comprehensive income 23 (181)  
Hedge ineffectiveness recognized in income 0 0  
Amount reclassified from cash flow hedge reserve to income (2) (3)  
Forward | Foreign exchange risk | Cash flow hedge      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Notional amount 2,194 1,416  
Book value, assets 0 34  
Book value, liabilities 74 15  
Variation in fair value used to calculate hedge ineffectiveness 24 (23)  
Variation in value recognized in other comprehensive income 24 (23)  
Hedge ineffectiveness recognized in income 0 0  
Amount reclassified from cash flow hedge reserve to income R$ 0 R$ 0