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Deferred revenues (Details) - ARS ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Current deferred revenues    
On prepaid calling cards - Fixed and Mobile Services $ 292 $ 261
On construction projects 48  
On connection fees - fixed services 36 35
On capacity rental 32 41
On mobile customer loyalty programs 95 87
From CONATEL - mobile services Nucleo (Note 18.d) 5 4
Other 7 15
Total current deferred revenues 515 443
Non-current deferred revenues    
On capacity rental - Fixed Services 195 252
On connection fees - Fixed services 82 87
On mobile customer loyalty programs 148 106
Total non-current deferred revenues 425 445
Total deferred revenues $ 940 $ 888