Inventories - Roll-forward of estimated losses (Details) - BRL (R$) R$ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Inventories [Line Items]
Opening Balance	R$ 208,091	R$ 97,934
(Provisions)/Reversals, net	16,193	141,635
Write-offs	19,204	31,478
Closing Balance	R$ 205,080	R$ 208,091

This element should be used to tag non-restated comparative information only. Allowance account for credit losses of financial assets at beginning of period. Allowance account for credit losses of financial assets at end of period

No definition available.

Name:	suz_AllowanceAccountForCreditLossesFinancialAssets
Namespace Prefix:	suz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant