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Employee Benefit Plans and Share-Based Payments - Summary of Share Based Compensation Plan (Plan 2013-2015 ) (Detail) - Plan 2013-15 [Member]
$ in Millions
 12 Months Ended
Dec. 31, 2016
ARS ($)
Dec. 31, 2016
$ / shares
Dec. 31, 2015
ARS ($)
Dec. 31, 2015
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Amount at the beginning of the year 188,493   695,015  
- Granted 9,130      
- Settled (193,878)   (503,535)  
- Expired (3,745)   (2,987)  
Amount at end of year     188,493  
Expense recognized during the year | $ $ 6   $ 34  
Fair value of shares on grant date (in dollars) | $ / shares   $ 14.75   $ 14.75