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7. MARKETABLE SECURITIES (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Investment Securities [line items]    
Current investments R$ 740 R$ 704
Non-current investments 13 109
Investments 753 813
Financial Notes Banks [Member]    
Disclosure of Investment Securities [line items]    
Current investments [1] 645 435
Non-current investments [1] 11 109
Treasury Financial Notes [Member]    
Disclosure of Investment Securities [line items]    
Current investments [2] 94 254
Debentures [Member]    
Disclosure of Investment Securities [line items]    
Current investments [3] 11
Non-current investments 2
Other Investment [Member]    
Disclosure of Investment Securities [line items]    
Current investments R$ 1 R$ 4
[1] 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 101.95% and 113% of the CDI rate in 2019 (102% and 111.25% in 2018 and 102.01% to 112% in 2017).
[2] 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.
[3] 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).