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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

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