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SEGMENT INFORMATION - Goodwill based on expected future profitability (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of products and services [line items]    
Goodwill Based On Expected Future Profitability R$ 8,061,818 R$ 158,334
Pulp    
Disclosure of products and services [line items]    
Goodwill Based On Expected Future Profitability 7,942,486 45,752
Consumer Goods    
Disclosure of products and services [line items]    
Goodwill Based On Expected Future Profitability R$ 119,332 R$ 112,582