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Income Tax - Summary of Tax Loss Carryforwards (Detail) - Argentina [member]
$ in Millions
 12 Months Ended
Dec. 31, 2017
ARS ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Amount $ 6,484
2018 Expiration [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Date of generation 2013
Date of expiration 2018
Jurisdiction Argentina
Amount $ 65
2019 Expiration [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Date of generation 2014
Date of expiration 2019
Jurisdiction Argentina
Amount $ 306
2020 Expiration [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Date of generation 2015
Date of expiration 2020
Jurisdiction Argentina
Amount $ 2,698
2021 Expiration [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Date of generation 2016
Date of expiration 2021
Jurisdiction Argentina
Amount $ 782
2022 expiration [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Date of generation 2017
Date of expiration 2022
Jurisdiction Argentina
Amount $ 2,633