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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.

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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 2020-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_53&doctype=Standard -URIDate 2020-01-01 + Details
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