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Segment information - Geographic information (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Geographic information      
Total revenues and other income $ 65,319 $ 53,323 $ 40,540
Total non-current assets Breakdown by location of operations 39,350 32,352 26,973
By location of operations      
Geographic information      
Total revenues and other income 65,319 53,323 40,540
Total non-current assets Breakdown by location of operations 39,350    
By location of customer      
Geographic information      
Total revenues and other income 65,319 53,323 40,540
Argentina      
Geographic information      
Total non-current assets Breakdown by location of operations   29,832 24,844
Argentina | By location of operations      
Geographic information      
Total revenues and other income 62,012 50,406 38,677
Total non-current assets Breakdown by location of operations 36,429    
Argentina | By location of customer      
Geographic information      
Total revenues and other income 61,696 49,958 38,388
Abroad      
Geographic information      
Total non-current assets Breakdown by location of operations   2,520 2,129
Abroad | By location of operations      
Geographic information      
Total revenues and other income 3,307 2,917 1,863
Total non-current assets Breakdown by location of operations 2,921    
Abroad | By location of customer      
Geographic information      
Total revenues and other income $ 3,623 $ 3,365 $ 2,152