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Financial Instruments and Risks - Measurement (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial Instruments and Risks
Financial assets	R$ 28,517,010	R$ 5,140,011
Financial liabilities	38,999,286	13,526,917
Trade accounts payable
Financial Instruments and Risks
Financial liabilities	632,565	621,179
Loans and financing
Financial Instruments and Risks
Financial liabilities	31,074,056	12,191,856
Debentures
Financial Instruments and Risks
Financial liabilities	4,663,453
Liabilities for asset acquisition and subsidiaries
Financial Instruments and Risks
Financial liabilities	992,512	585,986
Derivative financial instruments
Financial Instruments and Risks
Financial liabilities	1,636,700	127,896
At amortized cost | Trade accounts payable
Financial Instruments and Risks
Financial liabilities	632,565	621,179
At amortized cost | Loans and financing
Financial Instruments and Risks
Financial liabilities	31,074,056	12,191,856
At amortized cost | Debentures
Financial Instruments and Risks
Financial liabilities	4,663,453
At amortized cost | Liabilities for asset acquisition and subsidiaries
Financial Instruments and Risks
Financial liabilities	992,512	585,986
At fair value through profit or loss | Derivative financial instruments
Financial Instruments and Risks
Financial liabilities	1,636,700	127,896
Financial investments
Financial Instruments and Risks
Financial assets	21,098,565	1,631,505
Derivative financial instruments
Financial Instruments and Risks
Financial assets	493,934	133,910
Cash and cash equivalents
Financial Instruments and Risks
Financial assets	4,387,453	1,076,833
Trade accounts receivable
Financial Instruments and Risks
Financial assets	2,537,058	2,297,763
At fair value through profit or loss | Financial investments
Financial Instruments and Risks
Financial assets	21,098,565	1,631,505
At fair value through profit or loss | Derivative financial instruments
Financial Instruments and Risks
Financial assets	493,934	133,910
At amortized cost | Cash and cash equivalents
Financial Instruments and Risks
Financial assets	4,387,453	1,076,833
At amortized cost | Trade accounts receivable
Financial Instruments and Risks
Financial assets	R$ 2,537,058	R$ 2,297,763

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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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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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