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26 Trade payables (Tables)
 12 Months Ended
Dec. 31, 2020
Trade Payables  
Schedule of trade payables
  Note    12.31.20     12.31.19 
Non-current          
Customer guarantees      274    290
Customer contributions      247    213
Total non-current      521    503
           
Current          
Payables for purchase of electricity - CAMMESA   2.b     21,384    5,945
Provision for unbilled electricity purchases - CAMMESA  2.b     6,644    6,722
Suppliers      4,560    4,140
Advance to customer       362    388
Customer contributions      32    42
Discounts to customers      37    51
Total current      33,019    17,288