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LEASE - Lease liabilities Rollforward (Details) - BRL (R$) R$ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Lease Liabilities |  |  |
Beginning balance | R$ 5,191,760 | R$ 3,984,070 | R$ 3,984,070
Additions | 479,673 |  | 1,092,768
Write-offs | (5,982) |  | (148,638)
Payments | (475,483) |  | (824,245)
Accrual of financial charges | 273,800 |  | 486,286
Exchange rate variation | (96,774) |  | 601,519
Ending balance | 5,366,994 |  | 5,191,760
Current | 593,691 |  | 620,177
Non-current | 4,773,303 |  | R$ 4,571,583
Leased Land |  |  |
Lease Liabilities |  |  |
Capitalized interest | R$ 61,260 | R$ 37,040 |

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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_CurrentLeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | suz_DisclosureOfQuantitativeInformationAboutLeaseLiabilitiesLineItems
Namespace Prefix: | suz_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount of capitalized interest expense. + 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 additional lease liabilities. + References No definition available. + Details
Name: | suz_LeaseLiabilitiesAddition
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of adjustment due to exchange rate variations relating to lease liabilities. + References No definition available. + Details
Name: | suz_LeaseLiabilitiesExchangeRateVariation
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of payment relating to lease liabilities. + References No definition available. + Details
Name: | suz_LeaseLiabilitiesPayments
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The decrease in lease liabilities due to write-offs. + References No definition available. + Details
Name: | suz_LeaseLiabilitiesWriteOffs
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of interest expense capitalized during the reporting period. + References No definition available. + Details
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Balance Type: | debit
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- Details
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