v3.26.1
Hedge accounting - Schedule of Type Of Strategy Is The Currency Risk (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about hedges [line items]    
Notional amount R$ 414,431 R$ 356,851
Fair value hedge    
Disclosure of detailed information about hedges [line items]    
Book value, assets 105,430 75,643
Book value, liabilities 39,018 25,377
Fair value, assets 105,804 75,736
Fair value, liabilities 39,229 25,200
Variation in fair value recognized in income 163 270
Notional amount 144,699 101,443
Variation in fair value used to calculate hedge ineffectiveness (171) (267)
Fair value hedge | Interest rate risk | Hedge of securities at amortized cost    
Disclosure of detailed information about hedges [line items]    
Book value, assets 55,761 2,186
Book value, liabilities 0 0
Fair value, assets 55,929 2,197
Fair value, liabilities 0 0
Variation in fair value recognized in income 168 11
Notional amount 55,573 2,186
Variation in fair value used to calculate hedge ineffectiveness (169) (10)
Fair value hedge | Interest rate risk | Hedge of securities at fair value through other comprehensive income    
Disclosure of detailed information about hedges [line items]    
Book value, assets 15,070 36,341
Book value, liabilities 0 0
Fair value, assets 15,017 36,116
Fair value, liabilities 0 0
Variation in fair value recognized in income (53) (225)
Notional amount 15,422 36,557
Variation in fair value used to calculate hedge ineffectiveness 49 224
Fair value hedge | Interest rate risk | Hedge of loan operations    
Disclosure of detailed information about hedges [line items]    
Book value, assets 34,599 37,116
Book value, liabilities 0 0
Fair value, assets 34,858 37,423
Fair value, liabilities 0 0
Variation in fair value recognized in income 259 307
Notional amount 34,599 37,116
Variation in fair value used to calculate hedge ineffectiveness (264) (304)
Fair value hedge | Interest rate risk | Hedge of funding    
Disclosure of detailed information about hedges [line items]    
Book value, assets 0 0
Book value, liabilities 38,990 25,287
Fair value, assets 0 0
Fair value, liabilities 39,191 25,088
Variation in fair value recognized in income (201) 199
Notional amount 39,075 25,287
Variation in fair value used to calculate hedge ineffectiveness 203 (199)
Fair value hedge | Foreign exchange risk    
Disclosure of detailed information about hedges [line items]    
Notional amount 29,033 19,363
Fair value hedge | Foreign exchange risk | Hedge of firm commitments    
Disclosure of detailed information about hedges [line items]    
Book value, assets 0 0
Book value, liabilities 28 90
Fair value, assets 0 0
Fair value, liabilities 38 112
Variation in fair value recognized in income (10) (22)
Notional amount 30 297
Variation in fair value used to calculate hedge ineffectiveness R$ 10 R$ 22