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Other Net Operating Results (Detail) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Other Operating Results Net [Abstract]      
Lawsuits $ (1,240) $ (1,253) $ (1,188)
Construction incentive 188 422 621
Insurance 206   371
Results from deconsolidation of subsidiaries   1,528  
Income from extension of concession agreements with partners of JO   1,407  
Temporary economic assistance   759 711
Miscellaneous 32 531 1,167
Other operating results, net $ (814) $ 3,394 $ 1,682