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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Fair value hierarchy (Details) - Fair value - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial Instruments and Risks
Financial assets	R$ 14,925,825	R$ 18,020,853
Financial liabilities	8,117,400	2,917,913
Level 1
Financial Instruments and Risks
Financial assets	444,712	1,631,319
Level 2
Financial Instruments and Risks
Financial assets	3,293,565	5,797,987
Financial liabilities	8,117,400	2,917,913
Level 3
Financial Instruments and Risks
Financial assets	11,187,548	10,591,547
Fair value through profit or loss
Financial Instruments and Risks
Financial liabilities	8,117,400	2,917,913
Fair value through profit or loss | Derivative financial instruments
Financial Instruments and Risks
Financial liabilities	8,117,400	2,917,913
Fair value through profit or loss | Level 2
Financial Instruments and Risks
Financial liabilities	8,117,400	2,917,913
Fair value through profit or loss | Level 2 | Derivative financial instruments
Financial Instruments and Risks
Financial liabilities	8,117,400	2,917,913
Fair value through profit or loss
Financial Instruments and Risks
Financial assets	3,738,277	7,429,306
Fair value through profit or loss | Derivative financial instruments
Financial Instruments and Risks
Financial assets	1,341,420	1,098,972
Fair value through profit or loss | Marketable securities
Financial Instruments and Risks
Financial assets	2,396,857	6,330,334
Fair value through profit or loss | Level 1
Financial Instruments and Risks
Financial assets	444,712	1,631,319
Fair value through profit or loss | Level 1 | Marketable securities
Financial Instruments and Risks
Financial assets	444,712	1,631,319
Fair value through profit or loss | Level 2
Financial Instruments and Risks
Financial assets	3,293,565	5,797,987
Fair value through profit or loss | Level 2 | Derivative financial instruments
Financial Instruments and Risks
Financial assets	1,341,420	1,098,972
Fair value through profit or loss | Level 2 | Marketable securities
Financial Instruments and Risks
Financial assets	1,952,145	4,699,015
Fair value through other comprehensive income
Financial Instruments and Risks
Financial assets	26,338	20,048
Fair value through other comprehensive income | Other investments | CelluForce Inc.
Financial Instruments and Risks
Financial assets	26,338	20,048
Fair value through other comprehensive income | Level 3
Financial Instruments and Risks
Financial assets	26,338	20,048
Fair value through other comprehensive income | Level 3 | Other investments | CelluForce Inc.
Financial Instruments and Risks
Financial assets	26,338	20,048
Amortized cost
Financial Instruments and Risks
Financial assets	11,161,210	10,571,499
Amortized cost | Biological assets
Financial Instruments and Risks
Financial assets	11,161,210	10,571,499
Amortized cost | Level 3
Financial Instruments and Risks
Financial assets	11,161,210	10,571,499
Amortized cost | Level 3 | Biological assets
Financial Instruments and Risks
Financial assets	R$ 11,161,210	R$ 10,571,499

X

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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