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INTANGIBLE - Valuation assumptions (Details)
 12 Months Ended
Dec. 31, 2020
R$ / $
$ / T
Assumptions used in valuation of cash-generating units  
Nominal tax rate for cash generating units 3.27%
Discount rate, based on WACC (as a percent) 9.19%
Not later than one year  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 5.01
Discount rate (pos-tax) 9.19%
Discount rate (pre-tax) 13.00%
Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 4.82
Discount rate (pos-tax) 9.19%
Discount rate (pre-tax) 13.00%
Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 4.81
Discount rate (pos-tax) 9.19%
Discount rate (pre-tax) 13.00%
Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 4.82
Discount rate (pos-tax) 9.19%
Discount rate (pre-tax) 13.00%
Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Average exchange rate | R$ / $ 4.88
Discount rate (pos-tax) 9.19%
Discount rate (pre-tax) 13.00%
Asia | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 495.0
Asia | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 651.7
Asia | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 457.5
Asia | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 492.5
Asia | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 502.4
Europe | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 490.5
Europe | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 640.1
Europe | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 504.7
Europe | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 505.9
Europe | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 516.1
North America | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 535.9
North America | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 647.9
North America | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 510.9
North America | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 512.0
North America | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 522.4
Latin America | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 511.3
Latin America | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 637.6
Latin America | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 502.8
Latin America | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 503.9
Latin America | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 514.1
Domestic (Brazil) | Not later than one year  
Assumptions used in valuation of cash-generating units  
Net average pulp price 421.6
Domestic (Brazil) | Later than one year and not later than two years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 641.4
Domestic (Brazil) | Later than two years and not later than three years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 505.7
Domestic (Brazil) | Later than three years and not later than four years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 506.9
Domestic (Brazil) | Later than four years and not later than five years  
Assumptions used in valuation of cash-generating units  
Net average pulp price 517.1