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Income Tax - Summary of Tax Loss Carryforwards (Detail) - Argentina [member]
$ in Millions
 12 Months Ended
Dec. 31, 2018
ARS ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Amount $ 21,575
Tax loss carryforwards at the expected recovery date [member] | 2018 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 $ 300
Tax loss carryforwards at the expected recovery date [member] | 2019 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 $ 2,700
Tax loss carryforwards at the expected recovery date [member] | 2020 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 $ 796
Tax loss carryforwards at the expected recovery date [member] | 2021 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 $ 3,418
Tax loss carryforwards at the expected recovery date [member] | 2022 expiration [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Date of generation 2018
Date of expiration 2023
Jurisdiction Argentina
Amount $ 14,361