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ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES - Corporate Reorganization of the Telecom Group (Details)
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
May 23, 2017
Vote
$ / shares
shares
May 22, 2017
Dec. 31, 2016
$ / shares
ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES          
Nominal value (in pesos per share) $ 1 $ 10,000     $ 10,000
Sofora          
ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES          
Nominal value (in pesos per share) $ 1        
Telecom Argentina | Sofora | WAI          
ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES          
Shares owned of capital stock (as a percent)       15.00%  
Class A Shares | Telecom Argentina          
ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES          
Number of shares to be converted | shares     161,039,447    
Nominal value (in pesos per share)     $ 1    
Number of vote per share | Vote     1    
Class B shares | Telecom Argentina          
ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES          
Nominal value (in pesos per share)     $ 1    
Number of vote per share | Vote     1    
Number of converted shares to be issued to Class B Preferred Shareholders | shares     161,039,477