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INTANGIBLE - Valuation assumptions (Details)
 12 Months Ended
Dec. 31, 2019
R$ / $
$ / T
Assumptions used in valuation of cash-generating units  
Nominal tax rate for cash generating units 3.60%
Discount rate, based on WACC (as a percent) 9.10%
Not later than one year  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 3.94
Discount rate (pos-tax) 9.10%
Discount rate (pre-tax) 12.50%
Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 3.92
Discount rate (pos-tax) 9.10%
Discount rate (pre-tax) 12.50%
Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 3.96
Discount rate (pos-tax) 9.10%
Discount rate (pre-tax) 12.50%
Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 4.02
Discount rate (pos-tax) 9.10%
Discount rate (pre-tax) 12.50%
Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 4.08
Discount rate (pos-tax) 9.10%
Discount rate (pre-tax) 12.50%
Asia | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 502.30
Asia | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 670.00
Asia | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 767.00
Asia | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 577.00
Asia | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 588.60
Europe | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 506.70
Europe | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 603.00
Europe | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 691.80
Europe | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 553.90
Europe | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 565.00
North America | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 559.40
North America | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 638.90
North America | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 733.00
North America | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 586.80
North America | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 598.60
Latin America | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 545.50
Latin America | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 660.40
Latin America | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 757.60
Latin America | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 606.60
Latin America | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 618.70
Domestic | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 439.50
Domestic | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 631.00
Domestic | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 723.90
Domestic | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 579.60
Domestic | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 600.10