Net financial results (Details) - BRL (R$) R$ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financial expenses [Abstract]
Interest on loans, financing and debentures (1)			R$ (1,743,417)	R$ (1,797,937)
Amortization of transaction costs (2)			(39,616)	(32,421)
Interest expenses on lease liabilities (3)			(222,185)	(223,237)
Other			(278,075)	(254,471)
Financial expenses			(2,283,293)	(2,308,066)
Financial income [Abstract]
Cash and cash equivalents and marketable securities			819,082	683,608
Other			62,023	106,290
Financial income			881,105	789,898
Results from derivative financial instruments [Abstract]
Income			824,285	6,758,955
Expenses			(5,349,163)	(1,859,936)
Results from derivative financial instruments	R$ (3,890,341)	R$ 2,903,766	(4,524,878)	4,899,019
Monetary and exchange rate variations, net [Abstract]
Exchange rate variations on loans, financing and debentures			(9,383,027)	4,543,048
Leases			(329,505)	191,986
Other assets and liabilities (4)			1,525,875	(1,110,099)
Monetary and exchange rate variations, net	R$ (6,487,329)	R$ 2,376,817	(8,186,657)	3,624,935
Net financial result			(14,113,723)	7,005,786
Interest costs capitalised			802,515	511,650
Transaction Costs for Loans and Financing				19
Reclassification to biological assets			R$ 104,137	R$ 49,946

The amount of income or cost associated with interest and other financing activities of the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 85
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_85&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

+ Details

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

- Definition

The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 21
-IssueDate 2023-01-01
-Paragraph 52
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2023-en-r&anchor=para_52_a&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 35
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_35&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The gains resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

+ Details

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

- Definition

The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

+ References

+ Details

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

- Definition

The amount of interest income on cash and cash equivalents. [Refer: Interest income; Cash and cash equivalents]

+ References

+ Details

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

- Definition

The losses resulting from changes in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

+ Details

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

- Definition

The amount of finance costs that the entity does not separately disclose in the same statement or note. [Refer: Finance costs]

+ References

+ Details

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

- Definition

The amount of finance income that the entity does not separately disclose in the same statement or note. [Refer: Finance income]

+ References

+ Details

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

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

No definition available.

+ Details

Name:	suz_AmortizationOfDebtIssuanceCost
Namespace Prefix:	suz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of costs associated with financing activities of the entity before gains (losses) on exchange differences.

+ References

No definition available.

+ Details

Name:	suz_FinanceCostBeforeExchangeDifferencesOnTranslation
Namespace Prefix:	suz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of income associated with interest and other financing activities of the entity before gains (losses) on exchange differences.

+ References

No definition available.

+ Details

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

- Definition

Financial expenses

+ References

No definition available.

+ Details

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

- Definition

The amount of financial expenses attributable to interest expense on lease liabilities.

+ References

No definition available.

+ Details

Name:	suz_FinancialExpensesInterestExpenseOnLeaseLiabilities
Namespace Prefix:	suz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Financial income

+ References

No definition available.

+ Details

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

- Definition

The amount of exchange differences related to loans and financing, recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9.

+ References

No definition available.

+ Details

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

- Definition

The amount of exchange differences related to other assets and liabilities, recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9.

+ References

No definition available.

+ Details

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

- Definition

The amount of gains (losses) on exchange rate variation net, relating to leases.

+ References

No definition available.

+ Details

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

- Definition

Monetary and exchange rate variations, net

+ References

No definition available.

+ Details

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

- Definition

Reclassification to biological assets

+ References

No definition available.

+ Details

Name:	suz_ReclassificationToBiologicalAssets
Namespace Prefix:	suz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Results from derivative financial instruments

+ References

No definition available.

+ Details

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

- Definition

The amount of transaction costs for loans and financing.

+ References

No definition available.

+ Details

Name:	suz_TransactionCostsForLoansAndFinancing
Namespace Prefix:	suz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration