Property, plant and equipment - Capitalized Expenses (Details) - BRL (R$) R$ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Disclosure of detailed information about property, plant and equipment [abstract]
Property, Plant and Equipment, Interest Costs Capitalised	R$ 205,409	R$ 959,967
Average Capitalisation Rate Per Month, Property, Plant and Equipment	13.14%	11.17%

The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition of property, plant and equipment.

No definition available.

Name:	suz_PropertyPlantAndEquipmentInterestCostsCapitalised
Namespace Prefix:	suz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration