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Investments - Investments in Associates and Joint Ventures (Details)
R$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
BRL (R$)
Jun. 30, 2023
BRL (R$)
Jun. 30, 2024
BRL (R$)
Jun. 30, 2023
BRL (R$)
Jun. 30, 2024
EUR (€)
Dec. 31, 2023
BRL (R$)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
BRL (R$)
Disclosure of joint ventures [line items]                
Equity R$ 40,614,195 R$ 42,700,013 R$ 40,614,195 R$ 42,700,013   R$ 44,810,300   R$ 33,166,365
Income (expenses) of the period (3,765,517) R$ 5,077,623 (3,545,485) 10,320,416        
Carrying amount 427,851   427,851     379,126    
In the income (expenses) for the period     (3,514) 419        
Average share price quoted on the NFNGM | €         € 1.60   € 2.40  
Associate | Foreign                
Disclosure of joint ventures [line items]                
Carrying amount 97,942   97,942     96,123    
In the income (expenses) for the period     (9,235) (11,010)        
Ensyn Corporation | Foreign                
Disclosure of joint ventures [line items]                
Equity 1,112   1,112          
Income (expenses) of the period     R$ (663)          
Participation equity (%)     25.53%          
Carrying amount 284   R$ 284     387    
In the income (expenses) for the period     (170) (4,304)        
Spinnova Plc | Foreign                
Disclosure of joint ventures [line items]                
Equity 520,012   520,012          
Income (expenses) of the period     R$ (10,088)          
Participation equity (%)     18.77%          
Carrying amount 97,658   R$ 97,658     95,736    
In the income (expenses) for the period     (9,065) (6,706)        
Joint ventures                
Disclosure of joint ventures [line items]                
Carrying amount 298,545   298,545     259,397    
In the income (expenses) for the period     5,721 11,661        
Biomas | Domestic (Brazil)                
Disclosure of joint ventures [line items]                
Equity 29,781   29,781          
Income (expenses) of the period     R$ (12,923)          
Participation equity (%)     16.66%          
Carrying amount 4,962   R$ 4,962     2,797    
In the income (expenses) for the period     (2,001) (175)        
Ibema Companhia Brasileira de Papel | Domestic (Brazil)                
Disclosure of joint ventures [line items]                
Equity 352,189   352,189          
Income (expenses) of the period     R$ 38,156          
Participation equity (%)     49.90%          
Carrying amount 175,742   R$ 175,742     156,703    
In the income (expenses) for the period     19,040 21,524        
F&E Technologies LLC | Foreign                
Disclosure of joint ventures [line items]                
Equity 11,451   11,451          
Income (expenses) of the period              
Participation equity (%)     50.00%          
Carrying amount 5,726   R$ 5,726     4,987    
In the income (expenses) for the period            
Woodspin Oy | Foreign                
Disclosure of joint ventures [line items]                
Equity 224,231   224,231          
Income (expenses) of the period     R$ (22,275)          
Participation equity (%)     50.00%          
Carrying amount 112,115   R$ 112,115     94,910    
In the income (expenses) for the period     (11,318) (9,688)        
Other investments evaluated at fair value through other comprehensive income                
Disclosure of joint ventures [line items]                
Carrying amount R$ 31,364   31,364     R$ 23,606    
In the income (expenses) for the period     R$ (232)