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Equity - Share capital (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share Capital    
Share Capital R$ 6,241,753 R$ 6,241,753
Number of shares outstanding 1,105,826,145  
Percentage of common shares 100.00%  
Maximum authorized increase in number of common shares 780,119,712  
Treasury shares    
Share Capital    
Number of shares outstanding 12,042,004  
Percentage of common shares 1.09%  
BRAZIL    
Share Capital    
SUZB3 common shares quoted (per share) R$ 38.08 R$ 18.69
Suzano Holding S.A.    
Share Capital    
Number of shares outstanding 367,612,234  
Percentage of common shares 33.24%  
Controlling Shareholders    
Share Capital    
Number of shares outstanding 185,693,440  
Percentage of common shares 16.80%  
Suzano Holding S.A. and Controlling Shareholders    
Share Capital    
Number of shares outstanding 553,305,674  
Percentage of common shares 50.04%  
Management    
Share Capital    
Number of shares outstanding 69,918,251  
Percentage of common shares 6.32%  
BNDESPAR    
Share Capital    
Number of shares outstanding 75,909,985  
Percentage of common shares 6.86%  
Mondrian Investment Partners    
Share Capital    
Number of shares outstanding 72,878,900  
Percentage of common shares 6.59%  
Others shareholders    
Share Capital    
Number of shares outstanding 321,771,331  
Percentage of common shares 29.10%