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Property, Plant and Equipment - Summary of Cost Evolution for Exploratory Wells in Evaluation Stage (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Property Plant And Equipment Cost Evolution [Line Items]      
Amount at beginning of year $ 308,014 $ 270,905  
Decrease of assets assignment (53,512) (44,752) $ (26,685)
Amount at end of year 354,443 308,014 270,905
Depreciation of property, plant and equipment [member]      
Disclosure Of Property Plant And Equipment Cost Evolution [Line Items]      
Amount at beginning of year 1,475 1,777 993
Additions pending the determination of proved reserves 758 1,112 1,219
Decreases charged to exploration expenses (591) (700) (479)
Decrease of assets assignment   (15) (89)
Reclassifications to mineral property, wells and related equipment with proved reserves (581) (1,004) (466)
Translation difference 175 305 599
Amount at end of year $ 1,236 $ 1,475 $ 1,777