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Employee Benefit Plans and Similar Obligations - Summary of Share Based Compensation Plan (Plan 2013-2015 ) (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
ARS ($)
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
ARS ($)
Dec. 31, 2016
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Expense recognized during the year $ 308 $ 162 $ 153  
Plan 2013-15 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Amount at the beginning of the year     188,493  
Granted     9,130  
Settled     (193,878)  
Expired     (3,745)  
Expense recognized during the year     $ 6  
Fair value of shares on grant date (in U.S. dollars) | $ / shares       $ 14.75