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Property, Plant and Equipment - Summary of Capitalized Cost for Exploratory Wells (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
ARS ($)
Well
Project
Dec. 31, 2016
ARS ($)
Dec. 31, 2015
ARS ($)
Disclosure Of Property Plant And Equipment Capitalized Cost Evolution [Line Items]      
Amount $ 28,629 $ 24,944 $ 16,016
From 1 to 5 years [member]      
Disclosure Of Property Plant And Equipment Capitalized Cost Evolution [Line Items]      
Amount $ 413    
Number of projects | Project 3    
Number of Wells | Well 3