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31. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 7) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
ASSETS      
Cash equivalents - Cash investments (Note 6) - CDI R$ 1,587 R$ 326  
Marketable securities (Note 7) - CDI / SELIC 4,125 753  
Restricted cash - CDI 64    
CVA and in tariffs (Note 14) - SELIC 4,058    
Assets 54,083 50,526 [1] R$ 59,855
LIABILITIES      
Loans, financing and debentures (Note 22) - CDI (2,310) (14,777)  
Sector financial liabilities (note 14) (9,690) (7,913) [1] R$ (23,394)
Total liabilities (36,605) 34,423 [1]  
Net assets (liabilities) exposed 3,295 (2,779)  
Domestic currency [member]      
ASSETS      
Cash equivalents - Cash investments (Note 6) - CDI 1,587 326  
Marketable securities (Note 7) - CDI / SELIC 4,125 753  
Restricted cash - CDI 64 12  
CVA and in tariffs (Note 14) - SELIC 133 882  
Assets 5,909 1,973  
LIABILITIES      
Loans, financing and debentures (Note 22) - CDI (2,310) (3,773)  
Loans, financing and debentures (Note 22) - TJLP (73) (244)  
Sector financial liabilities (note 14) (231)  
Total liabilities (2,614) (4,017)  
Net assets (liabilities) exposed R$ 3,295 R$ (2,044)  
[1] See note 2.8.