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7. MARKETABLE SECURITIES (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Investment Securities [line items]    
Current investments R$ 3,360 R$ 740 [1]
Non-current investments 765 13 [1]
Investments 4,125 753
Bank deposit certificates (CDBs) [member]    
Disclosure of Investment Securities [line items]    
Current investments [2] 545  
Financial Notes Banks [member]    
Disclosure of Investment Securities [line items]    
Current investments [3] 2,074 645
Non-current investments 730 11
Marketable securities - treasury financial notes [member]    
Disclosure of Investment Securities [line items]    
Current investments [4] 731 94
Debentures [member]    
Disclosure of Investment Securities [line items]    
Current investments [5]  
Non-current investments [6] 25 2
Other Investment [member]    
Disclosure of Investment Securities [line items]    
Current investments 10 R$ 1
Non-current investments R$ 10  
[1] See note 2.8.
[2] 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.
[3] 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).
[4] 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.
[5] 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 108.25% to 113% of the CDI Rate in 2019 (104.25% to 151% of CDI in 2018 and 104.25% to 161.54% of CDI in 2017).
[6] 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).