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CASH AND CASH EQUIVALENTS (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash and cash equivalents |  |  |  |
Cash and banks | R$ 6,212,318 | R$ 2,464,097 |  |
Cash equivalents |  |  |  |
Total cash and cash equivalents | R$ 6,835,057 | 3,249,127 | R$ 4,387,453 | R$ 1,076,833
Fixed | Cash and banks |  |  |  |
Cash equivalents |  |  |  |
Average yield | 0.41% |  |  |
Domestic (Brazil) |  |  |  |
Cash equivalents |  |  |  |
Fixed-term deposits | R$ 115,032 | 630,075 |  |
Domestic (Brazil) | CDI | Fixed-term deposits |  |  |  |
Cash equivalents |  |  |  |
Percentage of basis used to calculate interest rate | 70.45% |  |  |
Foreign |  |  |  |
Cash equivalents |  |  |  |
Fixed-term deposits | R$ 507,707 | R$ 154,955 |  |
Foreign | Fixed | Fixed-term deposits |  |  |  |
Cash equivalents |  |  |  |
Average yield | 0.43% |  |  |

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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 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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