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Net sales by product - Segment information (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |
Net sales | R$ 47,403,282 | R$ 39,755,575 | R$ 49,830,946
Total of products |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 47,403,282 | 39,755,575 | 49,830,946
Market pulp (1) |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | R$ 37,593,462 | R$ 30,677,265 | 41,384,322
Market pulp (1) | CHINA |  |  |
Disclosure of operating segments [line items] |  |  |
Percentage of entity's revenue | 36.92% | 41.36% |
Market pulp (1) | UNITED STATES |  |  |
Disclosure of operating segments [line items] |  |  |
Percentage of entity's revenue | 16.08% | 15.32% |
Printing and writing paper (2) |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | R$ 8,478,489 | R$ 7,567,320 | 6,912,984
Printing and writing paper (2) | ARGENTINA |  |  |
Disclosure of operating segments [line items] |  |  |
Percentage of entity's revenue | 10.96% | 23.68% |
Printing and writing paper (2) | UNITED STATES |  |  |
Disclosure of operating segments [line items] |  |  |
Percentage of entity's revenue | 22.50% | 19.49% |
Paperboard |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | R$ 1,270,872 | R$ 1,417,075 | 1,421,338
Other |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | R$ 60,459 | R$ 93,915 | R$ 112,302
Fluff pulp |  |  |
Disclosure of operating segments [line items] |  |  |
Percentage of entity's revenue | 0.70% | 0.80% |
Tissue |  |  |
Disclosure of operating segments [line items] |  |  |
Percentage of entity's revenue | 5.80% | 5.10% |

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