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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

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