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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$)
Dec. 31, 2021
BRL (R$)
INVESTMENTS            
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 (7,044,706)   14,106,381   R$ 23,394,887  
Company participation, in the income (expense) of the year R$ (13,845)   R$ (19,379)      
Percentage of ownership interest in subsidiary 100.00%   100.00%      
Non-current financial assets at fair value through other comprehensive income R$ 1,591,437 1,591,437 R$ 379,126 379,126    
Total for all associates | Foreign            
INVESTMENTS            
Company participation, in equity 125,316 125,316 96,123 96,123    
Company participation, in the income (expense) of the year R$ (26,656)   (32,557)      
Ensyn Corporation | Foreign            
INVESTMENTS            
Participation equity (%), Associate 24.80%          
Company participation, in equity R$ 2 2 387 387    
Company participation, in the income (expense) of the year R$ (6,966)   (12,448)      
Spinnova Plc | Foreign            
INVESTMENTS            
Participation equity (%), Associate 18.77%          
Company participation, in equity R$ 95,254 95,254 95,736 95,736    
Company participation, in the income (expense) of the year R$ (19,690)   (20,109)      
Simplifyber, Inc | Foreign            
INVESTMENTS            
Participation equity (%), Associate 13.91%          
Company participation, in equity R$ 30,060 30,060        
Total for all joint ventures            
INVESTMENTS            
Company participation, in equity 328,055 328,055 259,397 259,397    
Company participation, in the income (expense) of the year R$ 12,811   13,178      
Biomas | Domestic (Brazil)            
INVESTMENTS            
Participation equity (%), Joint venture 16.66%          
Company participation, in equity R$ 2,923 2,923 2,797 2,797    
Company participation, in the income (expense) of the year R$ (4,874)   (2,203)      
Ibema Companhia Brasileira de Papel | Domestic (Brazil)            
INVESTMENTS            
Participation equity (%), Joint venture 49.90%          
Company participation, in equity R$ 193,901 193,901 156,703 156,703    
Company participation, in the income (expense) of the year R$ 37,199   35,161      
F&E Technologies LLC | Foreign            
INVESTMENTS            
Participation equity (%), Joint venture 50.00%          
Company participation, in equity R$ 6,378 6,378 4,987 4,987    
Company participation, in the income (expense) of the year        
Woodspin Oy | Foreign            
INVESTMENTS            
Participation equity (%), Joint venture 50.00%          
Company participation, in equity R$ 124,853 124,853 94,910 94,910    
Company participation, in the income (expense) of the year R$ (19,514)   (19,780)      
Bem Agro Integração e Desenvolvimento S.A            
INVESTMENTS            
Percentage of ownership interest in subsidiary 5.82%          
Bem Agro Integração e Desenvolvimento S.A | Domestic (Brazil)            
INVESTMENTS            
Non-current financial assets at fair value through other comprehensive income R$ 4,026 4,026        
Celluforce Inc.            
INVESTMENTS            
Percentage of ownership interest in subsidiary 8.28%          
Celluforce Inc. | Foreign            
INVESTMENTS            
Non-current financial assets at fair value through other comprehensive income R$ 27,823 27,823 23,606 23,606    
Nfinite Nanotechnology Inc. (Indirect)            
INVESTMENTS            
Percentage of ownership interest in subsidiary 5.00%          
Nfinite Nanotechnology Inc. (Indirect) | Foreign            
INVESTMENTS            
Non-current financial assets at fair value through other comprehensive income R$ 6,347 6,347        
Lenzing Aktiengesellschft            
INVESTMENTS            
Percentage of ownership interest in subsidiary 15.00%          
Lenzing Aktiengesellschft | Foreign            
INVESTMENTS            
Non-current financial assets at fair value through other comprehensive income R$ 1,099,870 1,099,870        
Total other investments evaluated at fair value            
INVESTMENTS            
Company participation, in the income (expense) of the year        
Non-current financial assets at fair value through other comprehensive income 1,138,066 1,138,066 R$ 23,606 R$ 23,606    
Ensyn Corporation            
INVESTMENTS            
Equity 6 6        
Income (expenses) of the year (17,776)          
Spinnova Plc            
INVESTMENTS            
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)            
INVESTMENTS            
Equity 17,536 R$ 17,536        
Income (expenses) of the year (30,151)          
Ibema Companhia Brasileira de Papel | Domestic (Brazil)            
INVESTMENTS            
Equity 388,580 388,580        
Income (expenses) of the year 74,547          
F&E Technologies LLC | Foreign            
INVESTMENTS            
Equity 12,756 12,756        
Income (expenses) of the year          
Woodspin Oy | Foreign            
INVESTMENTS            
Equity 249,706 R$ 249,706        
Income (expenses) of the year R$ (38,665)