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Financial Instruments and Risks - Liquidity Risk (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial Instruments and Risks
Financial Liabilities, Book Value	R$ 38,999,286	R$ 13,526,917
Trade accounts payable
Financial Instruments and Risks
Financial Liabilities, Book Value	632,565	621,179
Loans and financing
Financial Instruments and Risks
Financial Liabilities, Book Value	31,074,056	12,191,856
Debentures
Financial Instruments and Risks
Financial Liabilities, Book Value	4,663,453
Liabilities for asset acquisition and subsidiaries
Financial Instruments and Risks
Financial Liabilities, Book Value	992,512	585,986
Derivative financial instruments
Financial Instruments and Risks
Financial Liabilities, Book Value	1,636,700	127,896
Liquidity risk
Financial Instruments and Risks
Financial Liabilities, Book Value	39,403,941	13,820,110
Financial liabilities, Future Value	58,306,342	17,622,806
Liquidity risk | Less than one year
Financial Instruments and Risks
Financial liabilities, Future Value	7,444,861	3,725,893
Liquidity risk | Later than one year and not later than two years
Financial Instruments and Risks
Financial liabilities, Future Value	4,966,440	2,772,968
Liquidity risk | Later than two years and not later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	19,155,180	5,127,502
Liquidity risk | Later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	26,739,859	5,996,443
Liquidity risk | Trade accounts payable
Financial Instruments and Risks
Financial Liabilities, Book Value	632,565	621,179
Financial liabilities, Future Value	632,565	621,179
Liquidity risk | Trade accounts payable | Less than one year
Financial Instruments and Risks
Financial liabilities, Future Value	632,565	621,179
Liquidity risk | Loans and financing
Financial Instruments and Risks
Financial Liabilities, Book Value	31,074,056	12,191,856
Financial liabilities, Future Value	45,997,323	15,897,299
Liquidity risk | Loans and financing | Less than one year
Financial Instruments and Risks
Financial liabilities, Future Value	4,818,397	2,704,902
Liquidity risk | Loans and financing | Later than one year and not later than two years
Financial Instruments and Risks
Financial liabilities, Future Value	3,672,268	2,686,542
Liquidity risk | Loans and financing | Later than two years and not later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	16,850,840	4,930,467
Liquidity risk | Loans and financing | Later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	20,655,818	5,575,388
Liquidity risk | Debentures
Financial Instruments and Risks
Financial Liabilities, Book Value	4,663,453
Financial liabilities, Future Value	8,022,759
Liquidity risk | Debentures | Less than one year
Financial Instruments and Risks
Financial liabilities, Future Value	340,044
Liquidity risk | Debentures | Later than one year and not later than two years
Financial Instruments and Risks
Financial liabilities, Future Value	419,401
Liquidity risk | Debentures | Later than two years and not later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	1,521,757
Liquidity risk | Debentures | Later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	5,741,556
Liquidity risk | Liabilities for asset acquisition and subsidiaries
Financial Instruments and Risks
Financial Liabilities, Book Value	992,512	585,986
Financial liabilities, Future Value	1,099,331	713,723
Liquidity risk | Liabilities for asset acquisition and subsidiaries | Less than one year
Financial Instruments and Risks
Financial liabilities, Future Value	495,862	95,284
Liquidity risk | Liabilities for asset acquisition and subsidiaries | Later than one year and not later than two years
Financial Instruments and Risks
Financial liabilities, Future Value	100,715	9,698
Liquidity risk | Liabilities for asset acquisition and subsidiaries | Later than two years and not later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	316,730	187,686
Liquidity risk | Liabilities for asset acquisition and subsidiaries | Later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	186,023	421,055
Liquidity risk | Derivative financial instruments
Financial Instruments and Risks
Financial Liabilities, Book Value	1,636,700	127,896
Financial liabilities, Future Value	2,149,710	97,412
Liquidity risk | Derivative financial instruments | Less than one year
Financial Instruments and Risks
Financial liabilities, Future Value	790,679	24,092
Liquidity risk | Derivative financial instruments | Later than one year and not later than two years
Financial Instruments and Risks
Financial liabilities, Future Value	736,715	63,971
Liquidity risk | Derivative financial instruments | Later than two years and not later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	465,853	9,349
Liquidity risk | Derivative financial instruments | Later than five years
Financial Instruments and Risks
Financial liabilities, Future Value	156,462
Liquidity risk | Other accounts payable
Financial Instruments and Risks
Financial Liabilities, Book Value	404,655	293,193
Financial liabilities, Future Value	404,655	293,193
Liquidity risk | Other accounts payable | Less than one year
Financial Instruments and Risks
Financial liabilities, Future Value	367,314	280,436
Liquidity risk | Other accounts payable | Later than one year and not later than two years
Financial Instruments and Risks
Financial liabilities, Future Value	R$ 37,341	R$ 12,757

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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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