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23. REGULATORY CHARGES (Tables)
 12 Months Ended
Dec. 31, 2020
Net movement in regulatory deferral account balances related to profit or loss [abstract]  
Schedule of information about amounts recognised in relation to regulatory deferral account balances
   

2020 

   2019
Liabilities        
Global Reversion Reserve (RGR)     28       31  
Energy Development Account (CDE)     64       58  
Grantor inspection fee – ANEEL     3       3  
Energy Efficiency Program     265       255  
Research and development (R&D)     225       199  
Energy System Expansion Research     4       3  
National Scientific and Technological Development Fund     8       6  
Proinfa – Alternative Energy Program     7       8  
Royalties for use of water resources     13       10  
Emergency capacity charge     26       26  
Customer charges – Tariff flags     90       —    
Others     4       5  
      737       604  
                 
Current liabilities     446       457  
Non-current liabilities     291       147