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Employee Benefit Plans and Share-Based Payments - Summary of Share Based Compensation Plan (Plan 2014-2017) (Detail) - Plan 2014-17 [Member]
$ in Millions
 12 Months Ended
Dec. 31, 2017
ARS ($)
Dec. 31, 2017
$ / shares
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 99,278   234,130   356,054  
- Granted 6,269   6,978      
- Settled (105,201)   (123,926)   (118,927)  
- Expired (346)   (17,904)   (2,997)  
Amount at end of year     99,278   234,130  
Expense recognized during the year | $ $ 8   $ 28   $ 53  
Fair value of shares on grant date (in dollars) | $ / shares   $ 33.41   $ 33.41   $ 33.41