Inventories (Details) - BRL (R$) R$ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Inventories [Line Items]
Current finished goods
Current work in progress	192,972	113,212
Spare parts and other	1,493,126	1,491,820
Estimated losses	(198,646)	(208,091)
Inventories	8,641,417	8,155,847
Pulp \| Country of domicile
Inventories [Line Items]
Current finished goods	841,688	644,881
Pulp \| Foreign countries
Inventories [Line Items]
Current finished goods	1,673,689	1,713,394
Paper \| Country of domicile
Inventories [Line Items]
Current finished goods	600,580	587,216
Paper \| Foreign countries
Inventories [Line Items]
Current finished goods	539,207	507,999
Wood
Inventories [Line Items]
Current work in progress	2,492,030	2,267,720
Operating supplies and packaging
Inventories [Line Items]
Current work in progress	R$ 1,006,771	R$ 1,037,696

A classification of current inventory representing the amount of goods that have completed the production process and are held for sale in the ordinary course of business. [Refer: Inventories]

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The amount of current inventories. [Refer: Inventories]

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A classification of current inventory representing the amount of interchangeable parts that are kept in an inventory and are used for the repair or replacement of failed parts. [Refer: Inventories]

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A classification of current inventory representing the amount of assets currently in production, which require further processes to be converted into finished goods or services. [Refer: Current finished goods; Inventories]

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The amount of an allowance account used to record impairments to financial assets due to credit losses.

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Inventories [Line Items]

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