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REGULATORY FRAMEWORK - Spectrum (Details)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Sep. 01, 2016
item
Nov. 27, 2014
USD ($)
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Sep. 30, 2017
USD ($)
item
Dec. 31, 2017
USD ($)
item
Feb. 27, 2018
USD ($)
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
ARS ($)
Dec. 31, 2015
ARS ($)
Regulatory framework                
Intangible assets | $           $ 7,098 $ 7,592 $ 7,659
3G/4G licenses                
Regulatory framework                
Intangible assets | $           4,780 $ 5,105  
Personal | 3G/4G licenses                
Regulatory framework                
Amount paid | $   $ 410.7            
Intangible assets | $   3,530.0            
Tax on bank debits capitalized | $   18.0            
Personal | 3G/4G licenses | 80/14                
Regulatory framework                
Amount paid | $   5.0            
Intangible assets | $   $ 43.0            
Personal | 3G/4G licenses | 80/14 | Minimum                
Regulatory framework                
Frequency band awarded, one (in MHz)   1,890            
Frequency band awarded, two (in MHz)   1,970            
Personal | 3G/4G licenses | 80/14 | Maximum                
Regulatory framework                
Frequency band awarded, one (in MHz)   1,892.5            
Frequency band awarded, two (in MHz)   1,972.5            
Personal | 3G/4G licenses | 81/14                
Regulatory framework                
Amount paid | $   $ 45.0            
Intangible assets | $   $ 387.0            
Personal | 3G/4G licenses | 81/14 | Minimum                
Regulatory framework                
Frequency band awarded, one (in MHz)   830.25            
Frequency band awarded, two (in MHz)   875.25            
Personal | 3G/4G licenses | 81/14 | Maximum                
Regulatory framework                
Frequency band awarded, one (in MHz)   834            
Frequency band awarded, two (in MHz)   879            
Personal | 3G/4G licenses | 82/14                
Regulatory framework                
Amount paid | $   $ 6.0            
Intangible assets | $   $ 51.0            
Personal | 3G/4G licenses | 82/14 | Minimum                
Regulatory framework                
Frequency band awarded, one (in MHz)   1,862.5            
Frequency band awarded, two (in MHz)   1,942.5            
Personal | 3G/4G licenses | 82/14 | Maximum                
Regulatory framework                
Frequency band awarded, one (in MHz)   1,867.5            
Frequency band awarded, two (in MHz)   1,947.5            
Personal | 3G/4G licenses | 83/14                
Regulatory framework                
Amount paid | $   $ 354.7            
Intangible assets | $   $ 3,049.0            
Balance amount of the bid paid | $       $ 247.3        
Performance guarantee (as a percent)       15.00%        
Usage period of the auctioned frequency bands       15 years        
Frequencies in the Lot 700              
Personal | 3G/4G licenses | 83/14 | Minimum                
Regulatory framework                
Frequency band awarded, one (in MHz)   1,730            
Frequency band awarded, two (in MHz)   2,130            
Personal | 3G/4G licenses | 83/14 | Maximum                
Regulatory framework                
Frequency band awarded, one (in MHz)   1,745            
Frequency band awarded, two (in MHz)   2,145            
Personal | 3G/4G licenses | 18/14                
Regulatory framework                
Deadline period for disengagement       2 years        
Personal | 3G/4G licenses | 18/14 | Minimum                
Regulatory framework                
Frequency band awarded, one (in MHz)       698        
Frequency band awarded, two (in MHz)       512        
Destination band       12.2        
Personal | 3G/4G licenses | 18/14 | Maximum                
Regulatory framework                
Frequency band awarded, one (in MHz)       806        
Frequency band awarded, two (in MHz)       698        
Destination band       12.7        
Nucleo | 3G/4G licenses                
Regulatory framework                
Deposit to be paid | $       $ 15.0        
Deposit paid, included in other current receivable | $           $ 278    
Nucleo | 3G/4G licenses | License Acquisition                
Regulatory framework                
Number of sub-bands awarded     2          
Consideration paid for each sub-bands | $     $ 12.0          
Auction price cancellation | $         $ 9.0