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25. REGULATORY CHARGES (Tables)
 12 Months Ended
Dec. 31, 2019
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
  2019           2018  
Liabilities               
Global Reversion Reserve (RGR)    31       29  
Energy Development Account (CDE)    58       122  
Regulator inspection fee – ANEEL    3       2  
Energy Efficiency Program    255       258  
Research and development (R&D)    199       225  
Energy System Expansion Research    3       2  
National Scientific and Technological Development Fund    6       5  
Proinfa – Alternative Energy Program    8       7  
Royalties for use of water resources    10       6  
Emergency capacity charge    26       31  
Others    5       6  
    604       693  
Current liabilities    457       514  
Non-current liabilities    147       179