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INVENTORIES - Changes in provision for losses (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Changes in provision for losses |  |
Balance at the beginning of the year | R$ (33,195) | R$ (51,911)
Business combination with Fibria | (11,117) |
Addition | (111,077) | (10,605)
Reversal | 9,734 | 5,873
Write-off | 38,942 | 23,448
Balance at the end of the year | (106,713) | (33,195)
Finished goods, estimated losses | 42,470 |
Raw materials, estimated losses | 39,382 |
Spare parts, write-off of inventory | 5,786 |
Raw materials, write-off of inventory | 26,083 |
Inventory, additional write-off recognized in the income statement | 5,190 | 29,828
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 2019-01-01 -Paragraph 36 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2019-en-r&anchor=para_36_h&doctype=Standard -URIDate 2019-03-27 + Details
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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
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Amount of increase in inventory loss of standalone copany + References No definition available. + Details
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Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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Namespace Prefix: | suzby_
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- Definition The amount of estimated loss of inventory classified as finished goods. + References No definition available. + Details
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Namespace Prefix: | suzby_
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of estimated loss of inventory classified as raw materials. + References No definition available. + Details
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Namespace Prefix: | suzby_
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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Balance Type: | credit
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- Definition Amount of valuation reserve for inventory. + References No definition available. + Details
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Namespace Prefix: | suzby_
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: | suzby_IfrsInventoryWriteDown
Namespace Prefix: | suzby_
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of inventory written off during the reporting period and recognized in profit (loss). + References No definition available. + Details
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Namespace Prefix: | suzby_
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
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Balance Type: | debit
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- Definition The amount of inventory classified as spare parts written off during the reporting period. + References No definition available. + Details
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Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration