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20. SUPPLIERS (Tables)
12 Months Ended
Dec. 31, 2020
Current raw materials and current production supplies [abstract]  
Schedule of suppliers
  2020   2019
Energy on spot market – CCEE     490       401  
Charges for use of energy network     192       145  
Energy purchased for resale     808       764  
Itaipu Binacional     325       243  
Gas purchased for resale     127       143  
Materials and services     416       384  
      2,358       2,080