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SEGMENT INFORMATION - Goodwill based on expected future profitability (Details) - BRL (R$)
R$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
SEGMENT INFORMATION    
Goodwill based on expected future profitability R$ 8,016,383 R$ 8,016,383
Pulp    
SEGMENT INFORMATION    
Goodwill based on expected future profitability 7,897,051 7,897,051
Paper    
SEGMENT INFORMATION    
Goodwill based on expected future profitability R$ 119,332 R$ 119,332