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29. FINANCE INCOME AND EXPENSES (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
FINANCE INCOME      
Income from financial investments R$ 95 R$ 102 R$ 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
Finance income 2,445 3,207 [2] 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)
Finance costs (3,350) (1,847) [2] (2,224)
NET FINANCE INCOME (EXPENSES) R$ (906) R$ 1,360 R$ (518)
[1] The PIS/Pasep and Cofins expenses apply to Interest on Equity.
[2] See note 2.8.