v3.26.1
Financial instruments and risk management - Exchange rate risk management (Details)
R$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
BRL (R$)
shares
Dec. 31, 2023
Dec. 31, 2025
BRL (R$)
Selling transactions in the futures markets | Currency risk      
Disclosure of detailed information about financial instruments [line items]      
Value at risk time horizon 24 years 24 months  
Probable (base value) | Currency risk | United States of America, Dollars | Cash and cash equivalents | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial assets R$ 8,707,419   R$ 11,919,897
Probable (base value) | Currency risk | United States of America, Dollars | Marketable securities | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 533,780   427,329
Probable (base value) | Currency risk | United States of America, Dollars | Trade accounts receivable | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 4,079,784   4,705,509
Probable (base value) | Currency risk | United States of America, Dollars | Trade accounts payable | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (810,849)   (1,075,590)
Probable (base value) | Currency risk | United States of America, Dollars | Loans and financing | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (66,085,589)   (70,357,356)
Probable (base value) | Currency risk | United States of America, Dollars | Other liabilities | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (63,890)   (66,446)
Probable (base value) | Currency risk | United States of America, Dollars | Derivative options | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 2,389,964   979,706
Probable (base value) | Currency risk | United States of America, Dollars | Derivative swaps | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 476,472   (851,428)
Probable (base value) | Currency risk | United States of America, Dollars | Derivative Non-Deliverable Forward (‘NDF’) Contracts | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 43,027   24,355
Probable (base value) | Currency risk | United States of America, Dollars | Embedded derivatives | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 25,642   112,058
Probable (base value) | Currency risk | United States of America, Dollars | Commodity Derivatives | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets R$ 378,898   R$ (34,379)
Possible 25% | Currency risk      
Disclosure of detailed information about financial instruments [line items]      
Closing foreign exchange rate, percentage of increase (decrease) 25.00%    
Possible 25% | Currency risk | United States of America, Dollars | Cash and cash equivalents | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial assets R$ (2,176,855)    
Possible 25% | Currency risk | United States of America, Dollars | Marketable securities | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial assets (133,445)    
Possible 25% | Currency risk | United States of America, Dollars | Trade accounts receivable | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial assets (1,019,946)    
Possible 25% | Currency risk | United States of America, Dollars | Trade accounts payable | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (202,712)    
Possible 25% | Currency risk | United States of America, Dollars | Loans and financing | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (16,521,397)    
Possible 25% | Currency risk | United States of America, Dollars | Other liabilities | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (15,973)    
Possible 25% | Currency risk | United States of America, Dollars | Derivative options | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets (4,573,200)    
Possible 25% | Currency risk | United States of America, Dollars | Derivative swaps | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets (3,307,337)    
Possible 25% | Currency risk | United States of America, Dollars | Derivative Non-Deliverable Forward (‘NDF’) Contracts | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets (43,027)    
Possible 25% | Currency risk | United States of America, Dollars | Embedded derivatives | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets (201,732)    
Possible 25% | Currency risk | United States of America, Dollars | Commodity Derivatives | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets R$ (94,776)    
Possible 25% | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Market interest rate exposure, percentage of increase (decrease) 25.00%    
Remote 50% | Currency risk      
Disclosure of detailed information about financial instruments [line items]      
Closing foreign exchange rate, percentage of increase (decrease) 50.00%    
Remote 50% | Currency risk | United States of America, Dollars | Cash and cash equivalents | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial assets R$ (4,353,710)    
Remote 50% | Currency risk | United States of America, Dollars | Marketable securities | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial assets (266,890)    
Remote 50% | Currency risk | United States of America, Dollars | Trade accounts receivable | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial assets (2,039,892)    
Remote 50% | Currency risk | United States of America, Dollars | Trade accounts payable | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (405,425)    
Remote 50% | Currency risk | United States of America, Dollars | Loans and financing | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (33,042,795)    
Remote 50% | Currency risk | United States of America, Dollars | Other liabilities | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (31,945)    
Remote 50% | Currency risk | United States of America, Dollars | Derivative options | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets (10,215,031)    
Remote 50% | Currency risk | United States of America, Dollars | Derivative swaps | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets (6,616,299)    
Remote 50% | Currency risk | United States of America, Dollars | Derivative Non-Deliverable Forward (‘NDF’) Contracts | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets (43,027)    
Remote 50% | Currency risk | United States of America, Dollars | Embedded derivatives | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets (403,464)    
Remote 50% | Currency risk | United States of America, Dollars | Commodity Derivatives | U.S. Dollar to Brazilian Real      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets R$ (189,511)    
Remote 50% | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Market interest rate exposure, percentage of increase (decrease) 50.00%    
Probable | Currency risk      
Disclosure of detailed information about financial instruments [line items]      
Closing foreign exchange rate | shares 5.2194