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Operating expenses - Cost of VAS (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating expenses      
Cost of mobile value added services $ (829) $ (1,446) $ (1,218)
Cost of fixed value added services (45) (53) (38)
Total Cost of VAS $ (874) $ (1,499) $ (1,256)