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4. CASH AND CASH EQUIVALENTS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |  |  |
Cash and banks | R$ 1,124,714 | R$ 193,702 |  |
Short-term investments | 1,123,290 | 3,217,870 |  |
Cash and cash equivalents | 2,248,004 | 3,411,572 | R$ 4,871,162 | R$ 7,861,052
Brazil |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Short-term investments | 619,727 | 656,625 |  |
Brazil | Government securities |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Short-term investments | 10,247 | 12,100 |  |
Brazil | Private securities |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Short-term investments | 609,480 | 644,525 |  |
Abroad | Time deposits |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Short-term investments | R$ 503,563 | R$ 2,561,245 |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard -URIDate 2018-03-16 + Details
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