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v3.25.3

Employee benefits plans - Disclosure of contributions by the company (Details) - BRL (R$) R$ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Suzano Prev |  |
Employer Contributions [Line Items] |  |
Employer contributions | R$ 18,077 | R$ 16,197

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- Definition The amount of employer contributions to retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2025-01-01 -Paragraph 35 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2025-en-r&anchor=para_35_b_i&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_EmployerContributions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Employer Contributions [Line Items] + References No definition available. + Details
Name: | suz_EmployerContributionsLineItems
Namespace Prefix: | suz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | suz_PlanNameAxis=suz_SuzanoPrevPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |