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Company's Operations - Equity interests (Details) - shares
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
Jun. 30, 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%  
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%  
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 13.91% 14.20%  
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 18.77% 18.76%  
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 Aktiengesellschft [Member] | 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 5.00% 4.90%  
Muçununga Serviços Ambientais, Restauração e Carbono Ltda. | BRAZIL      
Company's Operations [Line Items]      
Proportion of ownership interest in associate 16.66%