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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%