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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
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)