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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.