v3.26.1
Hedge accounting - Schedule of The Financial Position And Performance (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedged items [line items]      
Variation in value recognized in other comprehensive income R$ 1,002 R$ (2,156) R$ 684
Notional amount 414,431 356,851  
Hedges of net investment in foreign operations      
Disclosure of detailed information about hedged items [line items]      
Assets 27,551 23,701  
Liabilities 0 0  
Variation in value recognized in other comprehensive income (15,392) (17,404)  
Foreign currency conversion reserve (15,392) (17,404)  
Notional amount 29,033 19,363  
Variation in fair value used to calculate hedge ineffectiveness (15,422) (17,428)  
Hedges of net investment in foreign operations | Hedges of net investment in foreign operations      
Disclosure of detailed information about hedged items [line items]      
Assets 27,551 23,701  
Liabilities 0 0  
Variation in value recognized in other comprehensive income (15,392) (17,404)  
Foreign currency conversion reserve (15,392) (17,404)  
Notional amount 29,033 19,363  
Variation in fair value used to calculate hedge ineffectiveness R$ (15,422) R$ (17,428)