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7. MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of investment securities [abstract] |
Schedule of marketable securities |
|  | 2020 |  | 2019
Investments |  |  |  |
Current |  |  |  |
Bank deposit certificates (CDBs) (1) |  |  | 545 |  |  |  | — |
Financial Notes (LFs) – Banks (2) |  |  | 2,074 |  |  |  | 645 |
Treasury Financial Notes (LFTs) (3) |  |  | 731 |  |  |  | 94 |
Others |  |  | 10 |  |  |  | 1 |
|  |  | 3,360 |  |  |  | 740 |
Non-current |  |  |  |  |  |  |  |
Financial Notes (LFs) – Banks (2) |  |  | 730 |  |  |  | 11 |
Debentures (4) |  |  | 25 |  |  |  | 2 |
Others |  |  | 10 |  |  |  | — |
|  |  | 765 |  |  |  | 13 |
|  |  | 4,125 |  |  |  | 753 |
(1) | Bank Deposit Certificates (CBDs), accrued interest at 106% a 110% of the CDI Rate (Interbank deposit rates) published by the Custody and Settlement Chamber (Cetip) in 2020.
(2) | Bank Financial Notes (Letras Financeiras, or LFs) are fixed-rate fixed-income securities, issued by banks and that accrued interest a percentage of the CDI rate published by Cetip. The LFs had remuneration rates varying between 99.5% and 130% of the CDI rate in 2020 (101.95% and 113% in 2019 and 102% to 111.25% in 2018).
(3) | Treasury Financial Notes (LFTs) are fixed-rate securities, their yield follows the daily changes in the Selic rate between the date of purchase and the date of maturity.
(4) | Debentures are medium and long term debt securities, which give their holders a right of credit against the issuing company. The debentures have remuneration varying from TR+1% to 109% of the CDI Rate in 2020 (108.25% to 113% of CDI in 2019 and 104.25% to 151% of CDI in 2018).

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