v3.26.1
Hedge accounting - Schedule of Management Strategy Guidelines (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]      
Notional amount R$ 414,431 R$ 356,851  
Variation in the value recognized in Other comprehensive income 1,002 (2,156) R$ 684
Fair value hedge      
Disclosure of detailed information about hedged items [line items]      
Notional amount 144,699 101,443  
Book value, assets 385 1,574  
Book value, liabilities 1,682 737  
Variations 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 detailed information about hedged items [line items]      
Notional amount 29,033 19,363  
Book value, assets 84 6,640  
Book value, liabilities 43 2,068  
Variations in fair value used to calculate hedge ineffectiveness (15,422) (17,428)  
Variation in the value recognized in Other comprehensive income (15,392) (17,404)  
Hedge ineffectiveness recognized in income (30) (24)  
Amount reclassified from foreign currency conversion reserve into income 0 (1)  
Fair value hedge | Foreign exchange risk | Future      
Disclosure of detailed information about hedged items [line items]      
Notional amount 12,285 5,234  
Book value, assets 0 21  
Book value, liabilities 0 0  
Variations in fair value used to calculate hedge ineffectiveness (4,848) (6,093)  
Variation in the value recognized in Other comprehensive income (4,808) (6,053)  
Hedge ineffectiveness recognized in income (40) (40)  
Amount reclassified from foreign currency conversion reserve into income 0 0  
Fair value hedge | Foreign exchange risk | Future / NDF      
Disclosure of detailed information about hedged items [line items]      
Notional amount 9,245 7,933  
Book value, assets 84 129  
Book value, liabilities 0 107  
Variations in fair value used to calculate hedge ineffectiveness (7,484) (2,640)  
Variation in the value recognized in Other comprehensive income (7,360) (2,610)  
Hedge ineffectiveness recognized in income (124) (30)  
Amount reclassified from foreign currency conversion reserve into income 0 (1)  
Fair value hedge | Foreign exchange risk | Future / Financial Assets      
Disclosure of detailed information about hedged items [line items]      
Notional amount 7,503 6,196  
Book value, assets 0 6,490  
Book value, liabilities 43 1,961  
Variations in fair value used to calculate hedge ineffectiveness (3,090) (8,695)  
Variation in the value recognized in Other comprehensive income (3,224) (8,741)  
Hedge ineffectiveness recognized in income 134 46  
Amount reclassified from foreign currency conversion reserve into income R$ 0 R$ 0