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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Property Plant And Equipment Cost Evolution [line items]      
Amount at beginning of year $ 354,443 $ 308,014  
Amount at end of year 699,087 354,443 $ 308,014
Depreciation of property, plant and equipment [member]      
Disclosure Of Property Plant And Equipment Cost Evolution [line items]      
Amount at beginning of year 1,236 1,475 1,777
Additions pending the determination of proved reserves 2,179 758 1,112
Decreases charged to exploration expenses (382) (591) (700)
Decreases of assets held for disposal     (15)
Reclassifications to mineral property, wells and related equipment with proved reserves (703) (581) (1,004)
Translation difference 1,737 175 305
Amount at end of year $ 4,067 $ 1,236 $ 1,475