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Financial Revenues and Expenses - Summary of Financial Income and Expenses (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
FINANCE INCOME |  |  |
Income from cash investments | R$ 205 | R$ 317 | R$ 251
Arrears fees on sale of energy | 261 | 277 | 230
Foreign exchange variations | 19 | 62 | 76
Monetary variations | 46 | 106 | 36
Monetary variations - CVA |  | 204 | 68
Monetary updating on Court escrow deposits | 191 | 46 | 212
Pasep and Cofins charged on finance income | (53) | (88) | (84)
Other | 135 | 117 | 74
Finance income | 804 | 1,041 | 863
FINANCE EXPENSES |  |  |
Costs of loans and financings | (1,466) | (1,860) | (1,370)
Cost of debt - amortization of transaction cost | (67) | (68) | (16)
Foreign exchange variations | (73) | (35) | (172)
Monetary updating - loans and financings | (109) | (245) | (387)
Monetary updating - onerous concessions |  | (3) | (11)
Charges and monetary updating on post-retirement obligation | (65) | (103) | (129)
Losses on financial instruments | (32) |  |
Monetary updating - CCEE obligations |  | (10) |
Monetary updating - CVA | (41) |  |
Monetary updating - AFAC | 239 |  |
Monetary updating - Advance sales of power supply | (45) |  |
Adjustment to present value | (2) |  |
Other | (139) | (154) | (119)
Finance costs | (1,800) | (2,478) | (2,204)
NET FINANCE INCOME (EXPENSES) | R$ (996) | R$ (1,437) | R$ (1,341)

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