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Financial instruments - Sensitivity analysis – foreign exchange rate exposure – derivative financial instruments (Details) - Currency risk [member] - BRL (R$)
R$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2023
Possible 25%    
Disclosure of detailed information about financial instruments [line items]    
Closing Foreign Exchange Rate, Percentage of increase (decrease) 25.00%  
Possible 25% | U.S. Dollar to Brazilian Real | Derivative options    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets R$ (5,104,632)  
Possible 25% | U.S. Dollar to Brazilian Real | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (3,218,272)  
Possible 25% | U.S. Dollar to Brazilian Real | Derivative Non-Deliverable Forward (‘NDF’) Contracts    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (116,280)  
Possible 25% | U.S. Dollar to Brazilian Real | Embedded derivative    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (174,998)  
Possible 25% | U.S. Dollar to Brazilian Real | Commodity Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (187)  
Possible 25% | U.S. Dollar to Euro | NDF parity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets R$ (2)  
Remote 50%    
Disclosure of detailed information about financial instruments [line items]    
Closing Foreign Exchange Rate, Percentage of increase (decrease) 50.00%  
Remote 50% | U.S. Dollar to Brazilian Real | Derivative options    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets R$ (12,077,754)  
Remote 50% | U.S. Dollar to Brazilian Real | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (6,517,850)  
Remote 50% | U.S. Dollar to Brazilian Real | Derivative Non-Deliverable Forward (‘NDF’) Contracts    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (232,553)  
Remote 50% | U.S. Dollar to Brazilian Real | Embedded derivative    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (349,995)  
Remote 50% | U.S. Dollar to Brazilian Real | Commodity Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (296)  
Remote 50% | U.S. Dollar to Euro | NDF parity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (4)  
Probable (base value) | U.S. Dollar to Brazilian Real | Derivative options    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 1,075,688  
Probable (base value) | U.S. Dollar to Brazilian Real | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (710,040)  
Probable (base value) | U.S. Dollar to Brazilian Real | Derivative Non-Deliverable Forward (‘NDF’) Contracts    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 28,442  
Probable (base value) | U.S. Dollar to Brazilian Real | Embedded derivative    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 99,383  
Probable (base value) | U.S. Dollar to Brazilian Real | Commodity Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (352)  
Probable (base value) | U.S. Dollar to Euro | NDF parity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets R$ (7)  
Selling transactions in the futures markets    
Disclosure of detailed information about financial instruments [line items]    
Value at Risk Time Horizon 24 years 24 years