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Intangible assets - Valuation assumptions (Details)
 12 Months Ended
Dec. 31, 2024
ha
R$ / shares
Disclosure of detailed information about intangible assets [line items]  
Average Exchange Rate | ha 5,400
Weighted Average Cost of Capital, Post Tax Percentage 8.91%
Weighted Average Cost of Capital, Pre-Tax Percentage 12.50%
After-tax discount rate applied to cash flow projections of both cash-generating units is higher than management's estimates 1.00%
Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Weighted Average Cost of Capital, Post Tax Percentage 9.91%
Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Weighted Average Cost of Capital, Post Tax Percentage 8.91%
Foreign countries  
Disclosure of detailed information about intangible assets [line items]  
Net Average Pulp Price 684,900
Country of domicile  
Disclosure of detailed information about intangible assets [line items]  
Net Average Pulp Price 735,500