INTANGIBLE - Changes in intangible assets with determined useful life (Details) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Intangible assets with determined useful life
Beginning balance	R$ 6,557,009	R$ 7,173,183
Additions	161,779	104,931
Fair value adjustment MMC Brasil		189,655
Write-offs		(2)
Amortization	(1,008,824)	(990,432)
Transfers and others		79,674
Ending balance	5,709,964	6,557,009
Cost
Intangible assets with determined useful life
Beginning balance	12,378,761
Ending balance	12,540,497	12,378,761
Accumulated depreciation, amortisation and impairment
Intangible assets with determined useful life
Beginning balance	(5,821,752)
Ending balance	(6,830,533)	(5,821,752)
Non-compete agreement
Intangible assets with determined useful life
Beginning balance	4,818
Ending balance	R$ 4,508	4,818
Amortisation rate, intangible assets other than goodwill	5.00%
Ports concession
Intangible assets with determined useful life
Beginning balance	R$ 537,179
Ending balance	R$ 632,253	537,179
Amortisation rate, intangible assets other than goodwill	3.94%
Lease agreements
Intangible assets with determined useful life
Beginning balance	R$ 6,875
Ending balance		6,875
Amortisation rate, intangible assets other than goodwill	16.90%
Supplier agreements, 12.90%
Intangible assets with determined useful life
Beginning balance	R$ 40,739
Ending balance	R$ 25,925	40,739
Amortisation rate, intangible assets other than goodwill	12.66%
Port service contracts
Intangible assets with determined useful life
Beginning balance	R$ 549,821
Ending balance	R$ 520,459	549,821
Amortisation rate, intangible assets other than goodwill	4.23%
Cultivars
Intangible assets with determined useful life
Beginning balance	R$ 40,784
Ending balance	R$ 20,391	40,784
Amortisation rate, intangible assets other than goodwill	14.28%
Trademarks and patents
Intangible assets with determined useful life
Beginning balance	R$ 188,723
Ending balance	R$ 170,306	188,723
Amortisation rate, intangible assets other than goodwill	8.35%
Customer-related intangible assets
Intangible assets with determined useful life
Beginning balance	R$ 4,925,879
Ending balance	R$ 4,104,900	4,925,879
Amortisation rate, intangible assets other than goodwill	9.09%
Supplier agreements, 17.64%
Intangible assets with determined useful life
Beginning balance	R$ 10,861
Ending balance	R$ 295	10,861
Amortisation rate, intangible assets other than goodwill	17.64%
Computer software
Intangible assets with determined useful life
Beginning balance	R$ 141,178
Ending balance	R$ 201,476	141,178
Amortisation rate, intangible assets other than goodwill	20.80%
Others
Intangible assets with determined useful life
Beginning balance	R$ 110,152
Ending balance	R$ 29,451	R$ 110,152
Amortisation rate, intangible assets other than goodwill	10.00%

The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Intangible assets other than goodwill]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_i&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-Clause vi
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_vi&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

The amortisation rate used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_AmortisationRateIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The decrease in intangible assets other than goodwill resulting from disposals and retirements. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_DisposalsAndRetirementsIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The increase (decrease) in intangible assets other than goodwill resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Intangible assets other than goodwill]

+ References

+ Details

Name:	ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 54
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_IntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase (decrease) in intangible assets other than goodwill resulting from revaluations to fair value. [Refer: Intangible assets other than goodwill; Revaluation surplus]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_iii&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_RevaluationIncreaseDecreaseIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=suz_NonCompeteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=suz_PortConcessionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=suz_IfrsLeaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=suz_SupplierAgreementsWithAverageRatePercentOf12.9PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=suz_PortServicesAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=suz_CultivarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=suz_BrandNamesAndPatentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_CustomerrelatedIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=suz_SupplierAgreementsWithAverageRatePercentOf17.6PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_OtherIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: