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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.

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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_53&doctype=Standard -URIDate 2019-03-27 + Details
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