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17. CONCESSION CONTRACT ASSETS (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [abstract]  
Schedule of detailed information about concession contract assets
  2019            2018   
Distribution – Infrastructure assets under construction    740       518  
Gas – Infrastructure assets under construction    68       82  
Transmission – Assets reincorporated into the assets remuneration base   348       492  
Transmission – Assets remunerated by tariff    849       637  
    2,005       1,729  
Current    172       131  
Non-current    1,833       1,598  
Schedule of changes in concession contract assets

Changes in concession contract assets are as follows:

  

    Transmission        Distribution        Gas       Total  
Balances at December 31, 2017    –            –             –             –     
Effects of adoption of IFRS 15   1,092       532       90       1,714  
Additions   96       727       70       893  
Inflation adjustment    88       –         –         88  
Adjustment to expected contract cash flow from the concession    13       –         –         13  
Amounts received    (161 )     –         –         (161 )
Transfers to financial assets    –         (27 )     –         (27 )
Transfers to intangible assets    –         (672 )     (78 )     (750 )
Transfers from PP&E    1               –         1  
Impairment           (42 )             (42 )
Balances at December 31, 2018    1,129       518       82       1,729  
Additions    221       903       43       1,167  
Inflation adjustment    34       –         –         34  
Adjustment to expected contract cash flow from the concession    15       –         –         15  
Amounts received    (154 )     –         –         (154 )
Disposals    (4 )     –         (2 )     (6 )
Transfers to financial assets    (44 )     (48 )     –         (92 )
Transfers to intangible assets    –         (630 )     (55 )     (685 )
Impairment   –         (3 )     –         (3 )
Balances at December 31, 2019    1,197       740       68       2,005