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Operating Costs And Expenses - Summary of Other Operating Expenses (Revenues), Net (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Other Operating Income Expense [Line Items] |  |  |
Leasing and rentals | R$ 103 | R$ 112 | R$ 102
Advertising | 30 | 13 | 11
Subsidies and donations | 19 | 17 | 31
Paid concession | 3 | 3 | 7
Insurance | 8 | 9 | 9
Net loss (gain) on deactivation and disposal of assets | 193 | 112 | 30
Forluz - Administrative running cost | 26 | 25 | 22
Collection agents | 71 | 70 | 71
Loss on investment | 9 |  |
Other expenses | (34) | 420 | 452
Other operating expenses (revenues), net | 383 | 155 | 426
Energy [member] |  |  |
Disclosure Of Other Operating Income Expense [Line Items] |  |  |
Own consumption of energy | 24 | 22 | 21
CCEE (Electricity Trading Chamber) [member] |  |  |
Disclosure Of Other Operating Income Expense [Line Items] |  |  |
CCEE annual charge | 8 | 8 | R$ 8
Taesa [member] |  |  |
Disclosure Of Other Operating Income Expense [Line Items] |  |  |
Gain on disposal, Taesa | R$ (207) | (181) |
Transchile Charrua Transmision SA [Member] |  |  |
Disclosure Of Other Operating Income Expense [Line Items] |  |  |
Gain on disposal, Transchile |  | R$ (134) |

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