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29. FINANCE INCOME AND EXPENSES (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of finance income expense [abstract]  
Schedule of financial income and expenses
  2020   2019   2018
FINANCE INCOME                        
Income from financial investments     95       102       116  
Interest on sale of energy     399       361       352  
Monetary variations     42       30       19  
Monetary variations – CVA (Note 14)     32       105       62  
Monetary updating of escrow deposits     53       50       34  
PIS/Pasep and Cofins charged on finance income (1)     (96 )     (128 )     (68 )
Gains on financial instruments –swap (Note 31)     1,753       998       893  
Inflation adjustment in arbitration case     —         —         77  
Borrowing costs paid by related parties     30       48       56  
Monetary updating on PIS/Pasep and Cofins taxes credits over ICMS (Note 9)     42       1,580       —    
Others     95       61       165  
      2,445       3,207       1,706  
FINANCE EXPENSES                        
Charges on loans and financings (Note 22)     (1,178 )     (1,227 )     (1,257 )
Cost of debt – amortization of transaction cost (Note 22)     (15 )     (38 )     (33 )
Foreign exchange variations - loans and financing (Note 22)     (1,742 )     (226 )     (582 )
Foreign exchange variations – Itaipu     (47 )     (13 )     (29 )
Monetary updating – loans and financings (Note 22)     (187 )     (142 )     (134 )
Monetary updating – onerous concessions     (9 )     (3 )     (3 )
Charges and monetary updating on post-employment obligations (Note 24)     (53 )     (56 )     (68 )
Monetary updating – Lease liabilities (Note 19)     (27 )     (34 )     —    
Finance income of P&D and PEE     (21 )     (24 )     (23 )
Others     (71 )     (84 )     (95 )
      (3,350 )     (1,847 )     (2,224 )
NET FINANCE INCOME (EXPENSES)     (906 )     1,360       (518 )

 

  (1) The PIS/Pasep and Cofins expenses apply to Interest on Equity.