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v3.25.3

Trade accounts receivables - Roll-forward of the expected credit losses (Details) - BRL (R$) R$ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Opening Balance | R$ 97,934 | R$ 95,053
Closing Balance | 104,209 | 97,934
Trade accounts receivable |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Opening Balance | 30,300 | 31,962
(Provisions)/Reversals, net | (103,502) | (2,585)
Utilisation Allowance Account For Credit Losses Financial Assetss | 8,145 | 5,790
Increase Decrease In Allowance Account For Credi tLosses Financial Assets | (4,141) | 1,543
Closing Balance | R$ 121,516 | R$ 30,300

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- References No definition available. + Details
Name: | ifrs-full_ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition 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 + References No definition available. + Details
Name: | suz_AllowanceAccountForCreditLossesFinancialAssets
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Increase Decrease In Allowance Account For Credi tLosses Financial Assets + References No definition available. + Details
Name: | suz_IncreaseDecreaseInAllowanceAccountForCrediTLossesFinancialAssets
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition (Provisions)/Reversals, net + References No definition available. + Details
Name: | suz_ProvisionsReversalsNet
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Utilisation, allowance account for credit losses of financial assets. This element should be used to tag non-restated comparative information only. + References No definition available. + Details
Name: | suz_UtilisationAllowanceAccountForCreditLossesFinancialAssetss
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |