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Income Tax - Summary of Breakdown of Deferred Tax (Detail) - ARS ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total deferred tax assets $ 24,765 $ 8,444 $ 7,526
Total deferred tax liabilities (115,589) (45,501) (49,427)
Total Net deferred tax (90,824) (37,057) (41,901)
Provisions and Other Non Deductible Liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total deferred tax assets 2,920 1,861 3,607
Miscellaneous Deferred Tax Assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total deferred tax assets 270 99 82
Property, plant and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total deferred tax liabilities (113,821) (43,931) (45,579)
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 21,575 6,484 3,837
Miscellaneous Deferred Tax Liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total deferred tax liabilities $ (1,768) $ (1,570) $ (3,848)