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Merger by Absorption Between Telecom Argentina and Cablevision S.A. - Capital Stock (Details) - shares
 6 Months Ended
Jun. 29, 2017
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity          
Number of shares outstanding     969,159,605    
Number of shares in entity held by entity or by its subsidiaries or associates     15,221,373 15,221,373 15,221,373
Number of shares issued     984,380,978    
Major ordinary share transactions          
Equity          
Number of shares outstanding   2,153,688,011      
Number of shares in entity held by entity or by its subsidiaries or associates   15,221,373      
Number of shares issued   2,168,909,384      
Cablevision Holding S.A.          
Equity          
Ownership interest in acquirer held before merger 55.00%        
Telecom Argentina          
Equity          
Ownership interest in acquirer held before merger 45.00%        
Class "A"          
Equity          
Number of shares outstanding     340,994,852    
Number of shares issued     340,994,852    
Class "A" | Major ordinary share transactions          
Equity          
Number of shares outstanding   683,856,600      
Number of shares issued   683,856,600      
Class "A" | Preliminary Merger Agreement and the Final Merger Agreement          
Equity          
Number of shares issued     342,861,748    
Class "A" | Preliminary Merger Agreement and the Final Merger Agreement | Fintech          
Equity          
Number of shares issued   342,861,748      
Class "B"          
Equity          
Number of shares outstanding     627,930,005    
Number of shares in entity held by entity or by its subsidiaries or associates     15,221,373    
Number of shares issued     643,151,378    
Class "B" | Major ordinary share transactions          
Equity          
Number of shares outstanding   627,930,005      
Number of shares in entity held by entity or by its subsidiaries or associates   15,221,373      
Number of shares issued   643,151,378      
Class "C"          
Equity          
Number of shares outstanding     234,748    
Number of shares issued     234,748    
Class "C" | Major ordinary share transactions          
Equity          
Number of shares outstanding   234,748      
Number of shares issued   234,748      
Class "D" | Major ordinary share transactions          
Equity          
Number of shares outstanding   841,666,658      
Number of shares issued   841,666,658      
Class "D" | Preliminary Merger Agreement and the Final Merger Agreement          
Equity          
Number of shares issued     841,666,658    
Class "D" | Preliminary Merger Agreement and the Final Merger Agreement | Cablevision Holding S.A.          
Equity          
Number of shares issued   406,757,183      
Class "D" | Preliminary Merger Agreement and the Final Merger Agreement | VLG Argentina LLC          
Equity          
Number of shares issued   434,909,475