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Information of operating segments - 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
Cost of sales (27,401,527) (25,076,675) (24,821,288)
Adjusted EBITDA 23,849,200 18,272,970 28,194,902
Adjustments to EBITDA 1,065,887 1,264,428 1,435,769
Depreciation, depletion and amortization (9,223,995) (7,321,110) (7,407,890)
Financial result (28,802,145) 5,780,928 6,432,800
Net income (loss) before taxes 15,691,092 12,216,288 22,222,781
Profit (loss) before tax (13,111,053) 17,997,216 28,655,581
Total Net Sales      
Disclosure of operating segments [line items]      
Net sales 47,403,282 39,755,575 49,830,946
Country of domicile      
Disclosure of operating segments [line items]      
Net sales 9,573,844 8,863,292 8,524,638
Foreign countries      
Disclosure of operating segments [line items]      
Net sales 37,829,438 30,892,283 41,306,308
Asia      
Disclosure of operating segments [line items]      
Net sales 15,785,567 13,660,165 18,298,105
Europe      
Disclosure of operating segments [line items]      
Net sales 12,251,178 9,003,272 13,093,824
North America      
Disclosure of operating segments [line items]      
Net sales 7,879,965 6,158,439 7,664,359
Central and South America      
Disclosure of operating segments [line items]      
Net sales 1,849,997 1,995,782 2,233,637
Africa      
Disclosure of operating segments [line items]      
Net sales 62,730 74,625 16,383
Pulp      
Disclosure of operating segments [line items]      
Cost of sales (21,261,705) (19,694,674) (19,958,000)
Adjusted EBITDA 20,866,160 15,194,660 25,098,535
Pulp | Total Net Sales      
Disclosure of operating segments [line items]      
Net sales 37,593,462 30,677,265 41,384,322
Pulp | Country of domicile      
Disclosure of operating segments [line items]      
Net sales 2,295,258 2,144,199 2,665,746
Pulp | Foreign countries      
Disclosure of operating segments [line items]      
Net sales 35,298,204 28,533,066 38,718,576
Pulp | Asia      
Disclosure of operating segments [line items]      
Net sales 15,760,800 13,588,032 18,294,046
Pulp | Europe      
Disclosure of operating segments [line items]      
Net sales 11,895,394 8,701,141 12,768,321
Pulp | North America      
Disclosure of operating segments [line items]      
Net sales 6,965,731 5,682,010 7,055,625
Pulp | Central and South America      
Disclosure of operating segments [line items]      
Net sales 670,157 558,601 592,360
Pulp | Africa      
Disclosure of operating segments [line items]      
Net sales 6,122 3,282 8,224
Paper      
Disclosure of operating segments [line items]      
Cost of sales (6,139,822) (5,382,001) (4,863,288)
Adjusted EBITDA 2,983,040 3,078,310 3,096,367
Paper | Total Net Sales      
Disclosure of operating segments [line items]      
Net sales 9,809,820 9,078,310 8,446,624
Paper | Country of domicile      
Disclosure of operating segments [line items]      
Net sales 7,278,586 6,719,093 5,858,892
Paper | Foreign countries      
Disclosure of operating segments [line items]      
Net sales 2,531,234 2,359,217 2,587,732
Paper | Asia      
Disclosure of operating segments [line items]      
Net sales 24,767 72,133 4,059
Paper | Europe      
Disclosure of operating segments [line items]      
Net sales 355,784 302,131 325,503
Paper | North America      
Disclosure of operating segments [line items]      
Net sales 914,234 476,429 608,734
Paper | Central and South America      
Disclosure of operating segments [line items]      
Net sales 1,179,840 1,437,181 1,641,277
Paper | Africa      
Disclosure of operating segments [line items]      
Net sales R$ 56,608 R$ 71,343 R$ 8,159