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Equity - Capital information (Details)
 12 Months Ended
Dec. 31, 2017
ARS ($)
Vote
$ / shares
shares
Jan. 01, 2018
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Equity        
Nominal value of issued shares | $ $ 984,380,978      
Nominal value (in pesos per share) | $ / shares $ 1   $ 1 $ 1
Number of votes per share | Vote 1      
Outstanding shares 969,159,605      
Treasury shares (in shares) 15,221,373   15,221,373 15,221,373
Total capital stock (in shares) 984,380,978   984,380,978 984,380,978
Shares issued 984,380,978      
Major ordinary share transactions        
Equity        
Outstanding shares   2,153,688,011    
Treasury shares (in shares)   15,221,373    
Shares issued   2,168,909,384    
Class "A"        
Equity        
Outstanding shares 340,994,852      
Shares issued 340,994,852      
Class "A" | Major ordinary share transactions        
Equity        
Outstanding shares   683,856,600    
Shares issued   683,856,600    
Class "A" | Preliminary Merger Agreement and the Final Merger Agreement        
Equity        
Shares issued 342,861,748      
Class "B"        
Equity        
Outstanding shares 627,930,005      
Treasury shares (in shares) 15,221,373      
Shares issued 643,151,378      
Number of shares each ADS represents 5      
Class "B" | Major ordinary share transactions        
Equity        
Outstanding shares   627,930,005    
Treasury shares (in shares)   15,221,373    
Shares issued   643,151,378    
Class "C"        
Equity        
Outstanding shares 234,748      
Shares issued 234,748      
Class "C" | Major ordinary share transactions        
Equity        
Outstanding shares   234,748    
Shares issued   234,748    
Class "D" | Major ordinary share transactions        
Equity        
Outstanding shares   841,666,658    
Shares issued   841,666,658    
Class "D" | Preliminary Merger Agreement and the Final Merger Agreement        
Equity        
Shares issued 841,666,658