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Total revenue and income - Summary of disaggregation by geographic location (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
BRL (R$)
Dec. 31, 2024
BRL (R$)
Dec. 31, 2023
BRL (R$)
Disclosure of disaggregation by geographic location [Line Items]      
Revenue and other operating income R$ 18,398,597 R$ 17,030,861 R$ 14,860,096
Selected assets R$ 17,631,793 17,260,303 13,852,708
Number of major customers 0    
BRAZIL      
Disclosure of disaggregation by geographic location [Line Items]      
Revenue and other operating income R$ 17,604,181 16,288,131 14,261,302
Selected assets 16,884,152 16,399,995 13,255,769
Exterior      
Disclosure of disaggregation by geographic location [Line Items]      
Revenue and other operating income 794,416 742,730 598,794
Selected assets R$ 747,641 R$ 860,308 R$ 596,939