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Equity - Summary (Details) - ARS ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity        
Equity attributable to Telecom Argentina (Controlling Company) $ 23,086 $ 19,336    
Equity attributable to non-controlling interest (Note 1.a) 793 542    
TOTAL EQUITY (See Consolidated Statements of Changes in Equity) $ 23,879 $ 19,878 $ 17,610 $ 14,769