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Property, Plant and Equipment - Summary of Cost for Exploratory Wells (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2018
ARS ($)
Well
Project
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
ARS ($)
Disclosure Of Property Plant And Equipment Capitalized Cost Evolution [line items]      
Amount $ 63,681 $ 28,629 $ 24,944
Exploration well [member]      
Disclosure Of Property Plant And Equipment Capitalized Cost Evolution [line items]      
Amount $ 1,031    
Number of projects | Project 4    
Number of Wells | Well 9    
Exploration well [member] | From 1 to 5 years [member]      
Disclosure Of Property Plant And Equipment Capitalized Cost Evolution [line items]      
Amount $ 656    
Number of projects | Project 3    
Number of Wells | Well 8    
Exploration well [member] | More than 5 years [member]      
Disclosure Of Property Plant And Equipment Capitalized Cost Evolution [line items]      
Amount $ 375    
Number of projects | Project 1    
Number of Wells | Well 1