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Financial Risk Management - Schedule of Breakdown of Effect a Variation of 10% in Prevailing Exchange Rates on Net Income (Details) (Detail) - Price risk [member]
$ in Millions
 12 Months Ended
Dec. 31, 2018
ARS ($)
Positive variation impact on net income before income tax corresponding to financial assets and liabilities [member]  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Income/(loss) for fiscal year ended December 31, 2018 $ 2,605
Negative variation impact on net income before income tax corresponding to financial assets and liabilities [member]  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Income/(loss) for fiscal year ended December 31, 2018 $ (2,605)
U.S. Dollar [member] | Positive variation impact on net income before income tax corresponding to financial assets and liabilities [member]  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Appreciation (+) / depreciation (-) of exchange rate of peso against U.S. dollar 10.00%
U.S. Dollar [member] | Negative variation impact on net income before income tax corresponding to financial assets and liabilities [member]  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Appreciation (+) / depreciation (-) of exchange rate of peso against U.S. dollar (10.00%)