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Consolidated statements of cash flow (Parenthetical) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Non cash transactions      
Acquisition of property, plant and equipment and concession extension easements not paid $ 6,019 $ 6,559 $ 6,799
Net increases (decreases) related to hydrocarbon wells abandonment obligation costs (4,913) 2,243 (1,281)
Contributions in joint ventures $ 19    
Dividends to collect   100 100
Increase in investments in financial assets through a decrease in trade receivables and other receivables   $ 9,918  
Decrease of loans due to "El Orejano" agreement     2,373
Contributions of non-controlling interests     $ 50