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Financial instruments - Sensitivity analysis – foreign exchange rate exposure – derivative financial instruments (Details) - Currency risk [member] - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
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$ (9,226,995)  
Possible 25% | U.S. Dollar to Brazilian Real | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (2,604,422)  
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 (896,742)  
Possible 25% | U.S. Dollar to Brazilian Real | Embedded derivative    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (183,663)  
Possible 25% | U.S. Dollar to Brazilian Real | Commodity Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets R$ 4,236  
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$ (19,121,860)  
Remote 50% | U.S. Dollar to Brazilian Real | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (4,992,835)  
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 (1,788,477)  
Remote 50% | U.S. Dollar to Brazilian Real | Embedded derivative    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (367,326)  
Remote 50% | U.S. Dollar to Brazilian Real | Commodity Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 8,478  
Probable (base value) | U.S. Dollar to Brazilian Real | Derivative options    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (4,328,970)  
Probable (base value) | U.S. Dollar to Brazilian Real | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (1,843,087)  
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 (331,876)  
Probable (base value) | U.S. Dollar to Brazilian Real | Embedded derivative    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets (80,759)  
Probable (base value) | U.S. Dollar to Brazilian Real | Commodity Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets R$ 16,973  
Selling transactions in the futures markets    
Disclosure of detailed information about financial instruments [line items]    
Value at Risk Time Horizon 24 years 24 years