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Financial instruments - Sensitivity analysis – foreign exchange rate exposure – derivative financial instruments (Details) - Currency risk [member] - BRL (R$)
R$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 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$ (6,463,834)  
Possible 25% | U.S. Dollar to Brazilian Real | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (2,591,116)  
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 (115,804)  
Possible 25% | U.S. Dollar to Brazilian Real | Embedded derivative    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (171,652)  
Possible 25% | U.S. Dollar to Brazilian Real | Commodity Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (3,485)  
Possible 25% | U.S. Dollar to Euro | NDF parity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets R$ (3)  
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$ (14,873,219)  
Remote 50% | U.S. Dollar to Brazilian Real | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (5,096,080)  
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 (232,931)  
Remote 50% | U.S. Dollar to Brazilian Real | Embedded derivative    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (343,304)  
Remote 50% | U.S. Dollar to Brazilian Real | Commodity Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (6,875)  
Remote 50% | U.S. Dollar to Euro | NDF parity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (6)  
Probable (base value) | U.S. Dollar to Brazilian Real | Derivative options    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 290,364  
Probable (base value) | U.S. Dollar to Brazilian Real | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (873,359)  
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 7,419  
Probable (base value) | U.S. Dollar to Brazilian Real | Embedded derivative    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 94,560  
Probable (base value) | U.S. Dollar to Brazilian Real | Commodity Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (13,465)  
Probable (base value) | U.S. Dollar to Euro | NDF parity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets R$ (14)  
Selling transactions in the futures markets    
Disclosure of detailed information about financial instruments [line items]    
Value at Risk Time Horizon 24 years 24 years