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31. FINANCE INCOME AND EXPENSES (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
FINANCE INCOME      
Income from financial investments R$ 102 R$ 116 R$ 205
Interest on sale of energy 361 352 261
Foreign exchange variations 19
Monetary variations 30 19 46
Monetary variations - CVA (Note 16) 105 62  
Monetary updating of escrow deposits 50 34 191
PIS/Pasep and Cofins charged on finance income [1] (128) (68) (53)
Gains on financial instruments - swap (Note 33) 998 893
Finance income from advance payments 5 29
Inflation adjustment in arbitration case 77
Borrowing costs paid by related parties (Note 32) 48 56
Monetary updating on PIS/Pasep and Cofins taxes credits over ICMS (Note 10) 1,580
Others 56 136 135
Finance income 3,207 1,706 804
FINANCE EXPENSES      
Charges on loans and financings (Note 24) (1,227) (1,257) (1,466)
Cost of debt - amortization of transaction cost (Note 24) (38) (33) (67)
Foreign exchange variations - loans and financing (Note 24) (226) (582) (73)
Foreign exchange variations - Itaipu (13) (29)  
Monetary updating - loans and financings (Note 24) (142) (134) (109)
Monetary updating - onerous concessions (3) (3)
Charges and monetary updating on post-employment obligations (Note 26) (56) (68) (65)
Losses on financial instruments (Note 33) (32)
Monetary variations - CVA (Note 16) (41)
Monetary updating - AFAC 239
Monetary updating - Advance sales of energy supply (Note 8) (1) (11) (45)
Adjustment to present value (2)
Monetary updating - Lease liabilities (Note 21) (34)
Finance income of P&D and PEE (24) (23)
Others (83) (84) (139)
Finance costs (1,847) (2,224) (1,800)
NET FINANCE INCOME (EXPENSES) R$ 1,360 R$ (518) R$ (996)
[1] The PIS/Pasep and Cofins expenses apply to Interest on Equity.