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Income and Social Contribution Taxes - Summary of Reconciliation of Statutory on Income and Social Contribution Taxes (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Reconciliation Of Expense On Income And Social Contribution Taxes [Abstract] |  |  |
Profit before income and Social Contribution taxes | R$ 1,646 | R$ 367 | R$ 3,362
Income tax and Social Contribution tax - nominal expense | (560) | (125) | (1,143)
Tax effects applicable to: |  |  |
Gain (loss) in subsidiaries by equity method (net of effects of Interest on Equity) | (129) | (132) | 105
Interest on Equity |  | 129 | 68
Gain on formation of Alianca Geracao |  |  | 87
Gain on dilution of an equity interest | 8 |  |
Deduction - Intangible assets of concession amortized - capital gain -Taesa |  | 20 |
Non-deductiblecontributions and donations | (6) | (4) | (7)
Tax incentives | 11 | 3 | 43
Tax credits not recognized |  | 5 | (1)
Difference between Presumed Profit and Real Profit | 81 | 126 | 25
Non-deductiblepenalties | (14) | (16) | (10)
Excess reactive power and demand | (2) | (12) | (11)
Write-down of part of estimated losses for doubtful debtors |  | (22) | (32)
Others | (33) | (5) | (17)
Income tax and Social Contribution - effective gain (expense) | (644) | (33) | (893)
Current tax | (446) | (174) | (881)
Deferred tax | (198) | 141 | (12)
Income tax and Social Contribution - effective gain (expense) | R$ (644) | R$ (33) | R$ (893)
Effective rate | 39.13% | 8.99% | 26.56%

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