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Income tax - Summary of analysis of other comprehensive income by item (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Other Comprehensive Income, Exchange Differences On Translation [Abstract]      
Other comprehensive income, before tax, exchange differences on translation of foreign operations R$ (99,474) R$ 147,671 R$ (41,160)
Other comprehensive income, net of tax, exchange differences on translation of foreign operations (99,474) 147,671 (41,160)
Other Comprehensive Income, Gains (Losses) On Net Investment Hedge [Abstract]      
Other comprehensive income, before tax, hedges of net investments in foreign operations 70,908 (136,598) 41,477
Income tax relating to hedges of net investments in foreign operations included in other comprehensive income     (6,874)
Other comprehensive income, net of tax, hedges of net investments in foreign operations 70,908 (136,598) 34,603
Other Comprehensive Income, Changes In The Fair Value Of Financial Assets At Fair Value [Abstract]      
Other comprehensive income, before tax, financial assets measured at fair value through other comprehensive income 682,244 (1,894,661) 905,670
Income tax relating to financial assets measured at fair value through other comprehensive income included in other comprehensive income (296,818) 728,007 (349,289)
Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income 385,426 (1,166,654) 556,381
Other comprehensive income, before tax, changes in discount rates (12,954)    
Other comprehensive income, other (12,954) 0 0
Balance      
Total other comprehensive income, before tax 640,724 (1,883,588) 905,987
Income tax relating to components of other comprehensive income (296,818) 728,007 (356,163)
Total other comprehensive income R$ 343,906 R$ (1,155,581) R$ 549,824