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Company's Operations - Equity interests (Details) - shares |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 23, 2025 | Dec. 31, 2024
Company's Operations [Line Items] |  |  |  |  |
% |  |  | 100.00% |  | 100.00%
Stock canceled During Period, Shares |  |  |  |  | (60,000,000,000)
F&E Tecnologia do Brasil S.A. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Biofuel production, except alcohol |  |
Country |  |  | Brazil |  |
% |  |  | 100.00% |  | 100.00%
Fibria Celulose (USA) Inc. (Direct) | UNITED STATES |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | United States of America |  |
% |  |  | 100.00% |  | 100.00%
Fibria Terminal de Celulose de Santos SPE S.A. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Port operations |  |
Country |  |  | Brazil |  |
% |  |  | 100.00% |  | 100.00%
FuturaGene Ltda. | England |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Biotechnology research and development |  |
Country |  |  | England |  |
% |  |  | 100.00% |  | 100.00%
FuturaGene Delaware Inc. (Indirect) | UNITED STATES |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Biotechnology research and development |  |
Country |  |  | United States of America |  |
% |  |  | 100.00% |  | 100.00%
FuturaGene Israel Ltda. (Indirect) | ISRAEL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Biotechnology research and development |  |
Country |  |  | Israel |  |
% |  |  | 100.00% |  | 100.00%
FuturaGene Inc. (Indirect) | UNITED STATES |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Biotechnology research and development |  |
Country |  |  | United States of America |  |
% |  |  | 100.00% |  | 100.00%
Maxcel Empreendimentos e Participações S.A. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Holding |  |
Country |  |  | Brazil |  |
% |  |  | 100.00% |  | 100.00%
Itacel - Terminal de Celulose de Itaqui S.A. (Indirect) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Port operations |  |
Country |  |  | Brazil |  |
% |  |  | 100.00% |  | 100.00%
Mucuri Energética S.A. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Power generation and distribution |  |
Country |  |  | Brazil |  |
% |  |  | 100.00% |  | 100.00%
Paineiras Logística e Transportes Ltda. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Road freight transport |  |
Country |  |  | Brazil |  |
% |  |  | 100.00% |  | 100.00%
Portocel - Terminal Espec. Barra do Riacho S.A. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Port operations |  |
Country |  |  | Brazil |  |
% |  |  | 51.00% |  | 51.00%
Projetos Especiais e Investimentos Ltda. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Commercialization of equipment and parts |  |
Country |  |  | Brazil |  |
% |  |  | 100.00% |  | 100.00%
SFBC Participações Ltda. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Packaging production |  |
Country |  |  | Brazil |  |
% |  |  | 100.00% |  | 100.00%
Stenfar S.A. Indl. Coml. Imp. Y. Exp. (Direct) | ARGENTINA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Commercialization of paper and computer materials |  |
Country |  |  | Argentina |  |
% |  |  | 100.00% |  | 100.00%
Suzano Austria GmbH. (Direct) | AUSTRIA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | Austria |  |
% |  |  | 100.00% |  | 100.00%
Suzano Canada Inc. (Direct) | CANADA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Lignin research and development |  |
Country |  |  | Canada |  |
% |  |  | 100.00% |  | 100.00%
Suzano Ecuador S.A.S. (Direct) | ECUADOR |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | Ecuador |  |
% |  |  | 100.00% |  | 100.00%
Suzano Finland Oy (Direct) | FINLAND |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Industrialization and commercialization of cellulose, microfiber cellulose and paper |  |
Country |  |  | Finland |  |
% |  |  | 100.00% |  | 100.00%
Suzano International Finance B.V (Direct) | NETHERLANDS |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Financial fundraising |  |
Country |  |  | Netherlands |  |
% |  |  | 100.00% |  | 100.00%
Suzano International Holding B.V. (Direct) | NETHERLANDS |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Holding |  |
Country |  |  | Netherlands |  |
% |  |  | 100.00% |  | 100.00%
Suzano International Trade GmbH. (Direct) | AUSTRIA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | Austria |  |
% |  |  | 100.00% |  | 100.00%
Suzano Packaging LLC (Indirect) | UNITED STATES |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Production of coated and uncoated paperboard, used in the production of Liquid Packaging Board and Cupstock |  |
Country |  |  | United States of America |  |
% |  |  | 100.00% |  | 100.00%
Suzano Material Technology Development Ltd. (Direct) | CHINA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Biotechnology research and development |  |
Country |  |  | China |  |
% |  |  | 100.00% |  | 100.00%
Suzano Netherlands B.V. (Direct) | NETHERLANDS |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Financial fundraising |  |
Country |  |  | Netherlands |  |
% |  |  | 100.00% |  | 100.00%
Suzano Operações Industriais e Florestais S.A. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Industrialization, commercialization and exporting of pulp |  |
Country |  |  | Brazil |  |
% |  |  | 100.00% |  | 100.00%
Suzano Pulp and Paper America Inc. (Direct) | UNITED STATES |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | United States of America |  |
% |  |  | 100.00% |  | 100.00%
Suzano Pulp and Paper Europe S.A. (Direct) | SWITZERLAND |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | Switzerland |  |
% |  |  | 100.00% |  | 100.00%
Suzano Shanghai Ltda. (Direct) | CHINA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | China |  |
% |  |  | 100.00% |  | 100.00%
Suzano Shanghai Trading Ltda. (Direct) | CHINA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | China |  |
% |  |  | 100.00% |  | 100.00%
Suzano Singapura Pte. Ltda. (Direct) | SINGAPORE |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | Singapore |  |
% |  |  | 100.00% |  | 100.00%
Suzano Trading International KFT(Direct) | HUNGARY |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Business office |  |
Country |  |  | Hungary |  |
% |  |  | 100.00% |  | 100.00%
Suzano Ventures LLC (Direct) | UNITED STATES |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Corporate venture capital |  |
Country |  |  | United States of America |  |
% |  |  | 100.00% |  | 100.00%
Veracel Celulose S.A. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Industrialization, commercialization and exporting of pulp |  |
Country |  |  | Brazil |  |
Proportion Of Ownership Interest in Equity Securities, accounting method, Joint operation |  |  | 50.00% |  | 50.00%
Allotrope Energy Ltd [Member] | England |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Research and development of battery technology based on carbon derived from lignin biomass |  |
Country |  |  | England |  |
Proportion of ownership interest in associate | [1] |  | 20.00% |  |
Biomas Serviços Ambientais, Restauração e Carbono S.A. (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Restoration, conservation and preservation of forests |  |
Country |  |  | Brazil |  |
Proportion of ownership interest in associate |  |  | 16.66% |  | 16.66%
Muçununga Serviços Ambientais, Restauração e Carbono Ltda. (Indirect) (1) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Proportion of ownership interest in associate |  | 50.00% | 8.33% | 100.00% |
Ensyn Corporation (Direct) | UNITED STATES |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Biofuel research and development |  |
Country |  |  | United States of America |  |
Proportion of ownership interest in associate |  |  | 24.80% |  | 24.80%
F&E Technologies LLC (Direct/Indirect) | UNITED STATES |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Biofuel production, except alcohol |  |
Country |  |  | United States of America |  |
Proportion of ownership interest in associate |  |  | 50.00% |  | 50.00%
Ibema Companhia Brasileira de Papel (Direct) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Industrialization and commercialization of paperboard |  |
Country |  |  | Brazil |  |
Proportion of ownership interest in associate |  |  | 49.90% |  | 49.90%
Simplifyber, Inc. (Indirect) | UNITED STATES |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Production of consumer goods through the transformation of cellulose-based liquids |  |
Country |  |  | United States of America |  |
Proportion of ownership interest in associate |  |  | 14.20% |  | 13.91%
Spinnova Plc. (Direct) (“Spinnova”) | FINLAND |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Research of sustainable raw materials for the textile industry |  |
Country |  |  | Finland |  |
Proportion of ownership interest in associate |  |  | 18.76% |  | 18.77%
Woodspin Oy (Direct/Indirect) (“Woodspin”) | FINLAND |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Development and production of cellulose-based fibers, yarns and textile filaments |  |
Country |  |  | Finland |  |
Proportion of ownership interest in associate |  |  | 50.00% |  | 50.00%
Bem Agro Integração e Desenvolvimento S.A. (Indirect) | BRAZIL |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Software solutions based on artificial intelligence and computer vision for agribusiness |  |
Country |  |  | Brazil |  |
Proportion of ownership interest in associate |  |  | 5.82% |  | 5.82%
Celluforce Inc. (Direct) | CANADA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Nanocrystalline pulp research and development |  |
Country |  |  | Canada |  |
Proportion Of Ownership Interest in Equity Securities, accounting method, Joint operation |  |  | 8.28% |  | 8.28%
Lenzing Aktiengesellschaft (Indirect) | AUSTRIA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Production of wood-based cellulose fibers |  |
Country |  |  | Austria |  |
Proportion of ownership interest in associate |  |  | 15.00% |  | 15.00%
Nfinite Nanotechnology Inc. (Indirect) | CANADA |  |  |  |  |
Company's Operations [Line Items] |  |  |  |  |
Main activity |  |  | Research and development of smart nanocoatings |  |
Country |  |  | Canada |  |
Proportion Of Ownership Interest in Equity Securities, accounting method, Joint operation |  |  | 4.90% |  | 5.00%
[1] | 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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