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Corporate Reorganization of the Telecom Group and Its controlling companies - Telecom Group Reorganization (Details)
May 23, 2017
Vote
$ / shares
shares
Dec. 31, 2017
$ / shares
Dec. 31, 2016
$ / shares
Dec. 31, 2015
$ / shares
Conversion terms approved by board        
Par value per share   $ 1 $ 1 $ 1
Telecom Argentina | Class "A"        
Conversion terms approved by board        
Par value per share $ 1      
Number of Votes Per Share | Vote 1      
Telecom Argentina | Class "A" | Maximum        
Conversion terms approved by board        
Number of shares to be converted | shares 161,039,447      
Telecom Argentina | Class "B"        
Conversion terms approved by board        
Par value per share $ 1      
Number of Votes Per Share | Vote 1