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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of trade and other receivables [abstract]  
Schedule of trade and other receivables
    Balances not yet due     Up to 90 days past due     More than 91 up to 360 days past due     More than 361 days past due     2020     2019  
                                     
Billed supply     1,518       637       387       583       3,125       3,130  
Unbilled supply     1,145       —         —         —         1,145       1,204  
Other concession holders – wholesale supply     18       26       1       5       50       47  
Other concession holders – wholesale supply, unbilled     260       —         —         —         260       204  
CCEE (Power Trading Chamber)     21       189       —         —         210       386  
Concession Holders – power transport     45       14       17       85       161       187  
Concession Holders – power transport, unbilled     295       —         —         —         295       253  
(–) Provision for doubtful receivables     (278 )     (12 )     (15 )     (407 )     (712 )     (810 )
      3,024       854       390       266       4,534       4,601  
                                                 
Current assets                                     4,373       4,524  
Non-current assets                                     161       77  
Schedule of provision for allowance for doubtful accounts

The allowance for doubtful accounts is considered to be sufficient to cover any potential losses in the realization of accounts receivable, and the breakdown by type of customers is as follows:


 

    2020   2019
Residential     110       131  
Industrial     188       197  
Commercial, services and others     190       161  
Rural     30       32  
Public authorities     83       201  
Public lighting     2       2  
Public services     35       31  
Charges for use of the network (TUSD)     74       55  
      712       810  
Schedule of changes in provision for doubtful accounts

Changes in the allowance for doubtful accounts in 2020, 2019 and 2018 are as follows:

 

Balance at December 31, 2017     568  
Effect of adoption of  IFRS 9 on Jan. 1, 2018     150  
Additions, net (Note 30 d)     264  
Write-off     (231 )
Balance at December 31, 2018     751  
Additions, net (Note 30 d)     238  
Disposals     (179 )
Balance at December 31, 2019     810  
Additions, net (Note 30 d)     146  
Disposals     (244 )
Balance at December 31, 2020     712