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Investments - Investments in Associates and Joint Ventures (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
BRL (R$)
Jun. 30, 2024
BRL (R$)
Jun. 30, 2025
BRL (R$)
Jun. 30, 2025
BRL (R$)
€ / shares
Jun. 30, 2024
BRL (R$)
Jun. 30, 2024
BRL (R$)
€ / shares
Dec. 31, 2024
BRL (R$)
Dec. 31, 2023
BRL (R$)
Disclosure of joint ventures [line items]                
Equity R$ 43,271,305,000 R$ 40,614,195,000 R$ 43,271,305,000 R$ 43,271,305,000 R$ 40,614,195,000 R$ 40,614,195,000 R$ 32,415,575,000 R$ 44,810,300,000
Income (expenses) of the period 5,011,953,000 (3,765,517,000) R$ 11,360,131,000   (3,545,485,000)      
%     100.00%       100.00%  
In the income (expenses) for the period     R$ (189,082,000)   (3,514,000)      
Impairment loss (reversal of impairment loss) recognised in profit or loss     76,066,000        
Goodwill 180,981,000   180,981,000 180,981,000     R$ 225,486,000  
Total Investments, including Goodwill and Financial Instruments 1,404,970,000   1,404,970,000 1,404,970,000     1,816,923,000  
Reclassification adjustments on exchange differences on translation of foreign operations, net of tax (15,636,000) R$ 4,000 (15,636,000)        
Associate | Foreign                
Disclosure of joint ventures [line items]                
Investments Accounted for Using Equity Method, Excluding Goodwill 92,617,000   92,617,000 92,617,000     125,316,000  
In the income (expenses) for the period     R$ (14,256,000)   (9,235,000)      
Ensyn Corporation | Foreign                
Disclosure of joint ventures [line items]                
Participation equity (%)     24.80%          
Investments Accounted for Using Equity Method, Excluding Goodwill (1,261,000)   R$ (1,261,000) (1,261,000)     2,000  
In the income (expenses) for the period     (4,539,000)   (170,000)      
Spinnova Plc                
Disclosure of joint ventures [line items]                
Impairment loss (reversal of impairment loss) recognised in profit or loss     (63,634,000)          
Goodwill 180,981,000   R$ 180,981,000 180,981,000     225,486,000  
Spinnova Plc | Foreign                
Disclosure of joint ventures [line items]                
Participation equity (%)     18.76%          
Investments Accounted for Using Equity Method, Excluding Goodwill 85,754,000   R$ 85,754,000 85,754,000     95,254,000  
In the income (expenses) for the period     (9,155,000)   (9,065,000)      
Joint ventures                
Disclosure of joint ventures [line items]                
Investments Accounted for Using Equity Method, Excluding Goodwill 199,650,000   199,650,000 199,650,000     328,055,000  
In the income (expenses) for the period     R$ (111,192,000)   5,721,000      
Biomas | Domestic (Brazil)                
Disclosure of joint ventures [line items]                
Participation equity (%)     16.66%          
Investments Accounted for Using Equity Method, Excluding Goodwill (184,000)   R$ (184,000) (184,000)     2,923,000  
In the income (expenses) for the period     R$ (3,107,000)   (2,001,000)      
Ibema Companhia Brasileira de Papel | Domestic (Brazil)                
Disclosure of joint ventures [line items]                
Participation equity (%)     49.90%          
Investments Accounted for Using Equity Method, Excluding Goodwill 194,213,000   R$ 194,213,000 194,213,000     193,901,000  
In the income (expenses) for the period     R$ 9,147,000   19,040,000      
F&E Technologies LLC | Foreign                
Disclosure of joint ventures [line items]                
Participation equity (%)     50.00%          
Investments Accounted for Using Equity Method, Excluding Goodwill 5,621,000   R$ 5,621,000 5,621,000     6,378,000  
In the income (expenses) for the period            
Woodspin Oy                
Disclosure of joint ventures [line items]                
Share Of Profit Loss Of Investments Accounted For Using Equity Method     R$ (117,848,000)          
Woodspin Oy | Foreign                
Disclosure of joint ventures [line items]                
Participation equity (%)     50.00%          
Investments Accounted for Using Equity Method, Excluding Goodwill       124,853,000  
In the income (expenses) for the period     (117,232,000)   (11,318,000)      
Total other investments evaluated at fair value                
Disclosure of joint ventures [line items]                
In the income (expenses) for the period            
Non-current financial assets at fair value through other comprehensive income 931,722,000   R$ 931,722,000 931,722,000     1,138,066,000  
Bem Agro Integração e Desenvolvimento S.A. (Indirect)                
Disclosure of joint ventures [line items]                
%     5.82%          
Bem Agro Integração e Desenvolvimento S.A. (Indirect) | Domestic (Brazil)                
Disclosure of joint ventures [line items]                
Non-current financial assets at fair value through other comprehensive income 3,551,000   R$ 3,551,000 3,551,000     4,026,000  
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 25,897,000   R$ 25,897,000 25,897,000     27,823,000  
Nfinite Nanotechnology Inc. (Indirect)                
Disclosure of joint ventures [line items]                
%     4.90%          
Nfinite Nanotechnology Inc. (Indirect) | Foreign                
Disclosure of joint ventures [line items]                
Non-current financial assets at fair value through other comprehensive income 5,594,000   R$ 5,594,000 5,594,000     6,347,000  
Lenzing Aktiengesellschft [Member]                
Disclosure of joint ventures [line items]                
%     15.00%          
Lenzing Aktiengesellschft [Member] | Foreign                
Disclosure of joint ventures [line items]                
Non-current financial assets at fair value through other comprehensive income 896,680,000   R$ 896,680,000 896,680,000     1,099,870,000  
Simplifyber, Inc (Indirect) | Foreign                
Disclosure of joint ventures [line items]                
Participation equity (%)     13.91%          
Investments Accounted for Using Equity Method, Excluding Goodwill 8,124,000   R$ 8,124,000 8,124,000     30,060,000  
In the income (expenses) for the period     (562,000)        
Total Goodwill                
Disclosure of joint ventures [line items]                
Impairment loss (reversal of impairment loss) recognised in profit or loss     (63,634,000)          
Goodwill 180,981,000   180,981,000 180,981,000     R$ 225,486,000  
Ensyn Corporation                
Disclosure of joint ventures [line items]                
Equity (5,086,000)   (5,086,000) (5,086,000)        
Income (expenses) of the period     (12,882,000)          
Spinnova Plc                
Disclosure of joint ventures [line items]                
Equity 457,112,000   457,112,000 R$ 457,112,000        
Income (expenses) of the period     (49,051,000)          
NASDAQ, Nordic Growth Market, Average Share Price | € / shares       R$ 0.48   R$ 0.95    
Biomas | Domestic (Brazil)                
Disclosure of joint ventures [line items]                
Equity (1,106,000)   (1,106,000) R$ (1,106,000)        
Income (expenses) of the period     (20,302,000)          
Ibema Companhia Brasileira de Papel | Domestic (Brazil)                
Disclosure of joint ventures [line items]                
Equity 389,205,000   389,205,000 389,205,000        
Income (expenses) of the period     18,330,000          
F&E Technologies LLC | Foreign                
Disclosure of joint ventures [line items]                
Equity 11,242,000   11,242,000 11,242,000        
Income (expenses) of the period              
Woodspin Oy | Foreign                
Disclosure of joint ventures [line items]                
Equity 235,697,000   235,697,000 235,697,000        
Income (expenses) of the period     (22,635,000)          
Simplifyber, Inc (Indirect)                
Disclosure of joint ventures [line items]                
Equity R$ 58,406,000   58,406,000 R$ 58,406,000        
Income (expenses) of the period     R$ (4,041,000)