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General information about financial statements (Tables) | 9 Months Ended
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Sep. 30, 2025
Company´s Operations [Abstract] |
Disclosure of subsidiaries |
|  |  |  |  |  | % equity interest
Entity/Type of investment |  | Main activity |  | Country |  | 09/30/2025 |  | 12/31/2024
Consolidated |  |  |  |  |  |  |  |
F&E Tecnologia do Brasil S.A. (Direct) |  | Biofuel production, except alcohol |  | Brazil |  | 100.00 | % |  | 100.00 | %
Fibria Celulose (USA) Inc. (Direct) |  | Business office |  | United States of America |  | 100.00 | % |  | 100.00 | %
Fibria Terminal de Celulose de Santos SPE S.A. (Direct) |  | Port operations |  | Brazil |  | 100.00 | % |  | 100.00 | %
FuturaGene Ltda. |  | Biotechnology research and development |  | England |  | 100.00 | % |  | 100.00 | %
FuturaGene Delaware Inc. (Indirect) |  | Biotechnology research and development |  | United States of America |  | 100.00 | % |  | 100.00 | %
FuturaGene Israel Ltda. (Indirect) |  | Biotechnology research and development |  | Israel |  | 100.00 | % |  | 100.00 | %
FuturaGene Inc. (Indirect) |  | Biotechnology research and development |  | United States of America |  | 100.00 | % |  | 100.00 | %
Maxcel Empreendimentos e Participações S.A. (Direct) |  | Holding |  | Brazil |  | 100.00 | % |  | 100.00 | %
Itacel - Terminal de Celulose de Itaqui S.A. (Indirect) |  | Port operations |  | Brazil |  | 100.00 | % |  | 100.00 | %
Mucuri Energética S.A. (Direct) |  | Power generation and distribution |  | Brazil |  | 100.00 | % |  | 100.00 | %
Paineiras Logística e Transportes Ltda. (Direct) |  | Road freight transport |  | Brazil |  | 100.00 | % |  | 100.00 | %
Portocel - Terminal Espec. Barra do Riacho S.A. (Direct) |  | Port operations |  | Brazil |  | 51.00 | % |  | 51.00 | %
Projetos Especiais e Investimentos Ltda. (Direct) |  | Commercialization of equipment and parts |  | Brazil |  | 100.00 | % |  | 100.00 | %
SFBC Participações Ltda. (Direct) |  | Packaging production |  | Brazil |  | 100.00 | % |  | 100.00 | %
Stenfar S.A. Indl. Coml. Imp. Y. Exp. (Direct) |  | Commercialization of paper and computer materials |  | Argentina |  | 100.00 | % |  | 100.00 | %
Suzano Austria GmbH. (Direct) |  | Business office |  | Austria |  | 100.00 | % |  | 100.00 | %
Suzano Canada Inc. (Direct) |  | Lignin research and development |  | Canada |  | 100.00 | % |  | 100.00 | %
Suzano Ecuador S.A.S. (Direct) |  | Business office |  | Ecuador |  | 100.00 | % |  | 100.00 | %
Suzano Finland Oy (Direct) |  | Industrialization and commercialization of cellulose, microfiber cellulose and paper |  | Finland |  | 100.00 | % |  | 100.00 | %
Suzano International Finance B.V (Direct) |  | Financial fundraising |  | Netherlands |  | 100.00 | % |  | 100.00 | %
Suzano International Holding B.V. (Direct) |  | Holding |  | Netherlands |  | 100.00 | % |  | 100.00 | %
Suzano International Trade GmbH. (Direct) |  | Business office |  | Austria |  | 100.00 | % |  | 100.00 | %
Suzano Packaging LLC (Indirect) |  | Production of coated and uncoated paperboard, used in the production of Liquid Packaging Board and Cupstock |  | United States of America |  | 100.00 | % |  | 100.00 | %
Suzano Material Technology Development Ltd. (Direct) |  | Biotechnology research and development |  | China |  | 100.00 | % |  | 100.00 | %
Suzano Netherlands B.V. (Direct) |  | Financial fundraising |  | Netherlands |  | 100.00 | % |  | 100.00 | %
Suzano Operações Industriais e Florestais S.A. (Direct) |  | Industrialization, commercialization and exporting of pulp |  | Brazil |  | 100.00 | % |  | 100.00 | %
Suzano Pulp and Paper America Inc. (Direct) |  | Business office |  | United States of America |  | 100.00 | % |  | 100.00 | %
Suzano Pulp and Paper Europe S.A. (Direct) |  | Business office |  | Switzerland |  | 100.00 | % |  | 100.00 | %
Suzano Shanghai Ltda. (Direct) |  | Business office |  | China |  | 100.00 | % |  | 100.00 | %
Suzano Shanghai Trading Ltda. (Direct) |  | Business office |  | China |  | 100.00 | % |  | 100.00 | %
Suzano Singapura Pte. Ltda. (Direct) |  | Business office |  | Singapore |  | 100.00 | % |  | 100.00 | %
Suzano Trading International KFT(Direct) |  | Business office |  | Hungary |  | 100.00 | % |  | 100.00 | %
Suzano Ventures LLC (Direct) |  | Corporate venture capital |  | United States of America |  | 100.00 | % |  | 100.00 | %
Joint operation |  |  |  |  |  |  |  |
Veracel Celulose S.A. (Direct) |  | Industrialization, commercialization and exporting of pulp |  | Brazil |  | 50.00 | % |  | 50.00 | %
|  |  |  |  |  | % equity interest
Entity/Type of investment |  | Main activity |  | Country |  | 09/30/2025 |  | 12/31/2024
Equity |  |  |  |  |  |  |  |
Allotrope Energy Ltd (Indirect) (2) |  | Research and development of battery technology based on carbon derived from lignin biomass |  | England |  | 20.00 | % |  |
Biomas Serviços Ambientais, Restauração e Carbono S.A. (Direct) |  | Restoration, conservation and preservation of forests |  | Brazil |  | 16.66 | % |  | 16.66 | %
Muçununga Serviços Ambientais, Restauração e Carbono Ltda. (Indirect) (1) |  | Restoration, conservation and preservation of forests |  | Brazil |  | 8.33 | % |  |
Ensyn Corporation (Direct) |  | Biofuel research and development |  | United States of America |  | 24.80 | % |  | 24.80 | %
F&E Technologies LLC (Direct/Indirect) |  | Biofuel production, except alcohol |  | United States of America |  | 50.00 | % |  | 50.00 | %
Ibema Companhia Brasileira de Papel (Direct) |  | Industrialization and commercialization of paperboard |  | Brazil |  | 49.90 | % |  | 49.90 | %
Simplifyber, Inc. (Indirect) |  | Production of consumer goods through the transformation of cellulose-based liquids |  | United States of America |  | 14.20 | % |  | 13.91 | %
Spinnova Plc. (Direct) (“Spinnova”) |  | Research of sustainable raw materials for the textile industry |  | Finland |  | 18.76 | % |  | 18.77 | %
Woodspin Oy (Direct/Indirect) (“Woodspin”) |  | Development and production of cellulose-based fibers, yarns and textile filaments |  | Finland |  | 50.00 | % |  | 50.00 | %
Fair value through other comprehensive income |  |  |  |  |  |  |  |
Bem Agro Integração e Desenvolvimento S.A. (Indirect) |  | Software solutions based on artificial intelligence and computer vision for agribusiness |  | Brazil |  | 5.82 | % |  | 5.82 | %
Celluforce Inc. (Direct) |  | Nanocrystalline pulp research and development |  | Canada |  | 8.28 | % |  | 8.28 | %
Lenzing Aktiengesellschaft (Indirect) |  | Production of wood-based cellulose fibers |  | Austria |  | 15.00 | % |  | 15.00 | %
Nfinite Nanotechnology Inc. (Indirect) |  | Research and development of smart nanocoatings |  | Canada |  | 4.90 | % |  | 5.00 | %
(1) On September 24, 2025, Biomas Serviços Ambientais, Restauração e Carbono S.A. reduced its ownership interest in Muçununga Serviços Ambientais, Restauração e Carbono Ltda. from 100% to 50%, which remains an indirect investee of Suzano S.A. (2) On September 30, 2025, pursuant to the Advance Subscription Agreement (ASA) entered into in December 2022, the investment made through Suzano Ventures in Allotrope Energy Ltd, held indirectly by Suzano S.A., was converted into Series Seed preferred shares, corresponding to 20% of the investee's share capital.

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- Definition The disclosure of subsidiaries. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2025-01-01 -Paragraph 17 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_17_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2025-01-01 -Paragraph 16 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_16_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 75 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_75_a&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph B4 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B4_a&doctype=Appendix&subtype=B -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 75 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_75_a&doctype=Standard -URIDate 2025-03-27 + Details
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