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Investments - Investments in Associates and Joint Ventures (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
BRL (R$)
Dec. 31, 2024
BRL (R$)
€ / shares
Dec. 31, 2023
BRL (R$)
Dec. 31, 2023
BRL (R$)
€ / shares
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
BRL (R$)
Disclosure of joint ventures [line items]            
Equity R$ 32,415,575 R$ 32,415,575 R$ 44,810,300 R$ 44,810,300 R$ 33,166,365 R$ 15,175,130
Income (expenses) of the year R$ (7,044,706)   R$ 14,106,381   R$ 23,394,887  
% 100.00%   100.00%      
In the income (expenses) for the year R$ (13,845)   R$ (19,379)      
Non-current financial assets at fair value through other comprehensive income 1,591,437 1,591,437 379,126 379,126    
Associate | Foreign            
Disclosure of joint ventures [line items]            
Carrying amount 125,316 125,316 96,123 96,123    
In the income (expenses) for the year R$ (26,656)   (32,557)      
Ensyn Corporation | Foreign            
Disclosure of joint ventures [line items]            
Participation equity (%) 24.80%          
Carrying amount R$ 2 2 387 387    
In the income (expenses) for the year R$ (6,966)   (12,448)      
Spinnova Plc | Foreign            
Disclosure of joint ventures [line items]            
Participation equity (%) 18.77%          
Carrying amount R$ 95,254 95,254 95,736 95,736    
In the income (expenses) for the year (19,690)   (20,109)      
Joint ventures            
Disclosure of joint ventures [line items]            
Carrying amount 328,055 328,055 259,397 259,397    
In the income (expenses) for the year R$ 12,811   13,178      
Biomas | Domestic (Brazil)            
Disclosure of joint ventures [line items]            
Participation equity (%) 16.66%          
Carrying amount R$ 2,923 2,923 2,797 2,797    
In the income (expenses) for the year R$ (4,874)   (2,203)      
Ibema Companhia Brasileira de Papel | Domestic (Brazil)            
Disclosure of joint ventures [line items]            
Participation equity (%) 49.90%          
Carrying amount R$ 193,901 193,901 156,703 156,703    
In the income (expenses) for the year R$ 37,199   35,161      
F&E Technologies LLC | Foreign            
Disclosure of joint ventures [line items]            
Participation equity (%) 50.00%          
Carrying amount R$ 6,378 6,378 4,987 4,987    
In the income (expenses) for the year        
Woodspin Oy | Foreign            
Disclosure of joint ventures [line items]            
Participation equity (%) 50.00%          
Carrying amount R$ 124,853 124,853 94,910 94,910    
In the income (expenses) for the year (19,514)   (19,780)      
Total other investments evaluated at fair value            
Disclosure of joint ventures [line items]            
In the income (expenses) for the year        
Non-current financial assets at fair value through other comprehensive income R$ 1,138,066 1,138,066 23,606 23,606    
Bem Agro Integração e Desenvolvimento S.A. (Indirect) (4)            
Disclosure of joint ventures [line items]            
% 5.82%          
Bem Agro Integração e Desenvolvimento S.A. (Indirect) (4) | Domestic (Brazil)            
Disclosure of joint ventures [line items]            
Non-current financial assets at fair value through other comprehensive income R$ 4,026 4,026        
Celluforce Inc. (Direct)            
Disclosure of joint ventures [line items]            
% 8.28%          
Celluforce Inc. (Direct) | Foreign            
Disclosure of joint ventures [line items]            
Non-current financial assets at fair value through other comprehensive income R$ 27,823 27,823 23,606 23,606    
Nfinite Nanotechnology Inc. (Indirect) (2)            
Disclosure of joint ventures [line items]            
% 5.00%          
Nfinite Nanotechnology Inc. (Indirect) (2) | Foreign            
Disclosure of joint ventures [line items]            
Non-current financial assets at fair value through other comprehensive income R$ 6,347 6,347        
Lenzing Aktiengesellschaft (Indirect) (5)            
Disclosure of joint ventures [line items]            
% 15.00%          
Lenzing Aktiengesellschaft (Indirect) (5) | Foreign            
Disclosure of joint ventures [line items]            
Non-current financial assets at fair value through other comprehensive income R$ 1,099,870 1,099,870        
Simplifyber, Inc (Indirect) (6) | Foreign            
Disclosure of joint ventures [line items]            
Participation equity (%) 13.91%          
Carrying amount R$ 30,060 30,060    
In the income (expenses) for the year        
Ensyn Corporation            
Disclosure of joint ventures [line items]            
Equity 6 6        
Income (expenses) of the year (17,776)          
Spinnova Plc            
Disclosure of joint ventures [line items]            
Equity 507,482 R$ 507,482        
Income (expenses) of the year (56,117)          
NASDAQ, Nordic Growth Market, Average Share Price | € / shares   R$ 0.95   R$ 2.40    
Biomas | Domestic (Brazil)            
Disclosure of joint ventures [line items]            
Equity 17,536 R$ 17,536        
Income (expenses) of the year (30,151)          
Ibema Companhia Brasileira de Papel | Domestic (Brazil)            
Disclosure of joint ventures [line items]            
Equity 388,580 388,580        
Income (expenses) of the year 74,547          
F&E Technologies LLC | Foreign            
Disclosure of joint ventures [line items]            
Equity 12,756 12,756        
Income (expenses) of the year          
Woodspin Oy | Foreign            
Disclosure of joint ventures [line items]            
Equity 249,706 249,706        
Income (expenses) of the year (38,665)          
Simplifyber, Inc (Indirect) (6)            
Disclosure of joint ventures [line items]            
Equity        
Income (expenses) of the year