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6. CASH AND CASH EQUIVALENTS (Details) - BRL (R$) R$ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Cash and cash equivalents [abstract] |  |  |  |
Bank accounts |  | R$ 93 | R$ 210 |
Cash equivalents |  |  |  |
Bank deposit certificates (CDBs) | [1] | 1,416 | 290 |
Overnight | [2] | 171 | 36 |
Short term investments |  | 1,587 | 326 |
Cash and cash equivalents |  | R$ 1,680 | R$ 536 | R$ 891
[1] | Bank Deposit Certificates (CDBs), accrued interest at 50% to 108%, of the CDI Rate (Interbank deposit rates) published by the Custody and Settlement Chamber (Cetip) in 2020 (80% to 106% in 2019 and 40% to 106% in 2018). For these CDBs, the Company has repo transactions which state, on their trading notes, the bank's commitment to repurchase the security, on demand, on the maturity date of the transaction, or earlier.
[2] | Overnight transactions are repos available for redemption on the following day. They are usually backed by Treasury Bills, Notes or Bonds and referenced to a pre-fixed rate of 1.89% in 2020 (4.39%, in 2019 and 6.39% in 2018). Their purpose is to settle the short-term obligations of the Company, or to be used in the acquisition of other assets with better return to replenish the portfolio.

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- Definition Overnight market classified as cash and cash equivalents. + References No definition available. + Details
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- Definition The amount of cash balances held at banks. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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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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