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Other receivables - Movements in the allowances (Details) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Other current receivables    
Movements in the allowances of other receivables    
At the beginning of the fiscal year $ (21) $ (25)
Additions (2)  
Uses   4
At the end of the year (23) (21)
Non-current regulatory receivables    
Movements in the allowances of other receivables    
At the beginning of the fiscal year (57) (84)
Compensation of Telecom Argentina's regulatory liabilities 1 27
At the end of the year (56) (57)
Non-current tax on personal property receivables    
Movements in the allowances of other receivables    
At the beginning of the fiscal year (18) (18)
At the end of the year $ (18) $ (18)