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Financial Instruments and Risks - Credit Risk Exposure (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial Instruments and Risks
Financial Assets, Book Value	R$ 28,517,010	R$ 5,140,011
Cash and cash equivalents
Financial Instruments and Risks
Financial Assets, Book Value	4,387,453	1,076,833
Financial investments
Financial Instruments and Risks
Financial Assets, Book Value	21,098,565	1,631,505
Trade accounts receivable
Financial Instruments and Risks
Financial Assets, Book Value	2,537,058	2,297,763
Derivative financial instruments
Financial Instruments and Risks
Financial Assets, Book Value	493,934	133,910
Credit risk
Financial Instruments and Risks
Financial Assets, Book Value	28,517,010	5,140,011
Credit risk | Cash and cash equivalents
Financial Instruments and Risks
Financial Assets, Book Value	4,387,453	1,076,833
Credit risk | Financial investments
Financial Instruments and Risks
Financial Assets, Book Value	21,098,565	1,631,505
Credit risk | Trade accounts receivable
Financial Instruments and Risks
Financial Assets, Book Value	2,537,058	2,297,763
Credit risk | Derivative financial instruments
Financial Instruments and Risks
Financial Assets, Book Value	R$ 493,934	R$ 133,910

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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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