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Related party balances and transactions - Controlling group (Details) - $ / shares
12 Months Ended
Nov. 30, 2017
Jun. 22, 2017
May 23, 2017
Dec. 31, 2017
Dec. 31, 2016
Mar. 08, 2016
Dec. 31, 2015
Related party balances and transactions              
Par value (in argentine peso per share)       $ 1 $ 1   $ 1
Sofora              
Related party balances and transactions              
Par value (in argentine peso per share)       $ 1      
Number of votes per share       1      
Fintech | Sofora              
Related party balances and transactions              
Acquisition percentage           51.00%  
Telecom Argentina | Nortel              
Related party balances and transactions              
Ownership percentage by parent 54.74%            
Ownership percentage after treasury shares acquisition 55.60%            
Telecom Argentina | Nortel | Class A Preferred shares              
Related party balances and transactions              
Ownership percentage by parent 51.00%            
Telecom Argentina | Nortel | Class B Preferred shares              
Related party balances and transactions              
Ownership percentage by parent 3.74%            
Equity interest in preferred shares (as a percent) 7.64%            
Telecom Argentina | Fintech              
Related party balances and transactions              
Ownership percentage by parent       39.50%      
Nortel | Sofora              
Related party balances and transactions              
Ownership percentage by parent 78.38%            
Sofora | Fintech              
Related party balances and transactions              
Ownership percentage by parent   15.00% 17.00%