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Income and Social Contribution Taxes - Summary of Deferred Income and Social Contribution Taxes (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax liabilities | R$ (1,916) | R$ (1,738)
Total, net | 1,136 | 1,215
Total assets | 1,871 | 1,797
Total liabilities | (735) | (582)
Deferred tax assets | 3,052 | 2,953
Tax loss carry forwards [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax assets | 524 | 290
Provisions [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax assets | 1,093 | 1,027
Post-retirement obligations [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax assets | 1,179 | 1,175
Estimated provision for doubtful receivables [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax assets | 207 | 229
Taxes with suspended liability [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax assets | 14 | 202
Paid concession [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax assets | 8 | 8
Adjustment to fair value: Swap/loss [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax assets | 13 |
Other [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax assets | 14 | 22
Funding cost [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax liabilities | (31) | (45)
Deemed cost [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax liabilities | (276) | (268)
Cost of acquisition of equity interests [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax liabilities | (464) | (481)
Borrowing costs capitalized [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax liabilities | (166) | (149)
Taxes on revenues not redeemed - Presumed Profit accounting method [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax liabilities | (1) | (2)
Transmission assets: Indemnity gain [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax liabilities | (937) | (517)
Adjustment of expectation of cash flow from the indemnifiable Financial asset of distribution concession [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax liabilities |  | (271)
Other Deferred Income And Social Contribution Taxes Liabilities [member] |  |
Disclosure of income and social contribution taxes recoverable [Line Items] |  |
Deferred tax liabilities | R$ (41) | R$ (5)

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