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Income Tax - Additional Information (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Estimated a tax loss carryforward $ 8,776    
Deferred income tax assets, net 588 $ 564 $ 954
Deferred income tax liabilities, net $ 37,645 42,465 44,812
Indeterminate Maturity [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused tax losses for which have not been recorded deferred tax asset   48  
Subsidiaries [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused tax losses for which have not been recorded deferred tax asset   1,138 4,373
Subsidiaries [member] | 2017 onwards [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused tax losses for which have not been recorded deferred tax asset   $ 1,090  
Subsidiaries [member] | Tax Losses Carryforward and Other Tax Credits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused tax losses for which have not been recorded deferred tax asset     2,332
Subsidiaries [member] | Non Recoverable Taxable Temporary Differences [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused tax losses for which have not been recorded deferred tax asset     $ 2,041
Argentina [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax loss carryforwards expire Expire within 5 years.    
Unused tax losses for which have not been recorded deferred tax asset $ 6,484