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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Exchange rate risk management (Details) - Currency Risk - BRL (R$) R$ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Time horizon for sales in the futures market	18 months
USD
Net exposure of assets and liabilities in foreign currency
Financial assets	R$ 12,657,016	R$ 8,930,200
Financial liabilities	(61,295,024)	(65,945,089)
Net liability exposure	(48,638,008)	(57,014,889)
USD | Trade accounts payable
Net exposure of assets and liabilities in foreign currency
Financial liabilities	(516,152)	(492,617)
USD | Loans and financing
Net exposure of assets and liabilities in foreign currency
Financial liabilities	(55,187,953)	(58,145,087)
USD | Liabilities for asset acquisition and associates
Net exposure of assets and liabilities in foreign currency
Financial liabilities	(308,766)	(313,022)
USD | Derivative financial instruments
Net exposure of assets and liabilities in foreign currency
Financial liabilities	(5,282,153)	(6,994,363)
USD | Cash and cash equivalents
Net exposure of assets and liabilities in foreign currency
Financial assets	8,412,710	6,370,201
USD | Trade accounts receivable
Net exposure of assets and liabilities in foreign currency
Financial assets	2,883,330	1,938,614
USD | Derivative financial instruments
Net exposure of assets and liabilities in foreign currency
Financial assets	R$ 1,360,976	R$ 621,385

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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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