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INVENTORIES - Changes in provision for losses (Details) - BRL (R$) R$ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Changes in provision for losses |  |
Beginning balance | R$ (79,885) | R$ (106,713)
Addition | (16,020) | (77,173)
Reversal | 5,353 | 11,498
Write-off | 35,563 | 92,503
Ending balance | (54,989) | (79,885)
Raw materials, estimated losses | 11,230 | 56,305
Finished pulp product, write-off of inventory | 1,083 | 32,018
Raw materials, write-off of inventory | 33,231 | 49,550
Inventories pledged as security for liabilities | R$ 0 | R$ 0

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- Definition The amount of inventories pledged as security for liabilities. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2020-01-01 -Paragraph 36 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2020-en-r&anchor=para_36_h&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase in the inventory valuation allowance during the reporting period. + References No definition available. + Details
Name: | suz_AdditionsToValuationAllowanceInventory
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The amount of estimated loss of inventory classified as raw materials. + References No definition available. + Details
Name: | suz_EstimatedLossesOfInventoryOfRawMaterials
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition It represents additional loss during the period + References No definition available. + Details
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Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of valuation reserve for inventory. + References No definition available. + Details
Name: | suz_IfrsInventoryValuationReserves
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References No definition available. + Details
Name: | suz_IfrsInventoryWriteDown
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of inventory classified as written off finished product during the reporting period. + References No definition available. + Details
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Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of inventory classified as raw materials written off during the reporting period. + References No definition available. + Details
Name: | suz_WriteOffRawMaterial
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration