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Income Tax - Summary of Breakdown of Deferred Tax (Detail) - ARS ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | $ 8,444 | $ 7,526 | $ 6,412
Total deferred tax liabilities | (45,501) | (49,427) | (50,270)
Total Net deferred tax | (37,057) | (41,901) | (43,858)
Provisions and Other Non Deductible Liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 1,861 | 3,607 | 3,093
Miscellaneous Deferred Tax Assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 99 | 82 | 83
Property, plant and equipment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax liabilities | (43,931) | (45,579) | (45,393)
Tax Losses Carryforward and Other Tax Credits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 6,484 | 3,837 | 3,236
Miscellaneous Deferred Tax Liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax liabilities | $ (1,570) | $ (3,848) | $ (4,877)

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