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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Tables)
 12 Months Ended
Dec. 31, 2019
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       2019       2018  
Billed supply    1,396            707            431            596            3,130            2,989   
Unbilled supply    1,204       –         –         –         1,204       1,048  
Other concession holders – wholesale supply    –         32       15       –         47       47  
Other concession holders – wholesale supply, unbilled    204       –         –         –         204       282  
CCEE (Power Trading Chamber)    –         –         386       –         386       166  
Concession Holders – power transport    80       20       6       81       187       180  
Concession Holders – power transport, unbilled    253       –         –         –         253       212  
(–) Provision for doubtful receivables    (171 )     (12 )     (38 )     (589 )     (810 )     (751 )
    2,966       747       800       88       4,601       4,173  
                                               
Current assets                                    4,524       4,092  
Non–current assets                                    77       81
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:

 

    2019          2018  
Residential    131       137  
Industrial    197       172  
Commercial, services and others    161       189  
Rural    32       33  
Public authorities    201       119  
Public lighting    2       6  
Public services    31       27  
Charges for use of the network (TUSD)    55       68  
    810       751  
               
Schedule of changes in provision for doubtful accounts

Changes in the allowance for doubtful accounts in 2019, 2018 and 2017 are as follows:

       
Balance at December 31, 2016    660   
Additions, net    248  
Write-off   (340 )
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  
Schedule of advances from customers

The Company receives advance payments for the sale of energy from certain customers. Advance payments related to services not yet provided are as follows:

       
Balance at December 31, 2017    233  
Additions    50  
Energy supplied   (215 )
Inflation adjustment (Note 31)    11  
Balance at December 31, 2018    79  
Energy supplied   (80 )
Inflation adjustment (Note 31)    1  
Balance at December 31, 2019    –