v3.26.1
Hedge accounting - Schedule Of Hedge Accounting (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
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
Fair value hedge    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount 144,699 101,443
Book value, assets 385 1,574
Book value, liabilities 1,682 737
Variation in fair value used to calculate hedge ineffectiveness (171) (267)
Hedge ineffectiveness recognized in income (8) 3
Fair value hedge | Foreign exchange risk    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount 29,033 19,363
Book value, assets 84 6,640
Book value, liabilities 43 2,068
Variation in fair value used to calculate hedge ineffectiveness (15,422) (17,428)
Hedge ineffectiveness recognized in income (30) (24)
Swaps | Fair value hedge | Interest rate risk    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount 102,677 90,201
Book value, assets 385 1,557
Book value, liabilities 1,682 737
Variation in fair value used to calculate hedge ineffectiveness (349) (328)
Hedge ineffectiveness recognized in income (11) 8
Futures | Fair value hedge | Interest rate risk    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount 41,992 10,945
Book value, assets 0 17
Book value, liabilities 0 0
Variation in fair value used to calculate hedge ineffectiveness 168 39
Hedge ineffectiveness recognized in income 3 (5)
Futures | Fair value hedge | Foreign exchange risk    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount 30 297
Book value, assets 0 0
Book value, liabilities 0 0
Variation in fair value used to calculate hedge ineffectiveness 10 22
Hedge ineffectiveness recognized in income R$ 0 R$ 0