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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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	suz_ChangesInProvisionForInventoryLossesAbstract
Namespace Prefix:	suz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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

X

- 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

X

- Definition

The amount of inventory classified as written off finished product during the reporting period.

+ References

No definition available.

+ Details

Name:	suz_WriteOffFinishedProduct
Namespace Prefix:	suz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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