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Contractual Commitments - Operating Lease Commitments - Additional Information (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of geographical areas [line items]      
Contracts of work and other services $ 12,314 $ 7,667 $ 7,612
Rental of real estate and equipment 4,988 2,306 1,698
Contingent installments $ 7,326 $ 5,361 $ 5,914
Property, Plant and Equipment under Operating Leases [Member]      
Disclosure of geographical areas [line items]      
Lease agreements of average term 3 years    
Lease agreements of additional renewed average term one    
Transportation Of Hydrocarbons [member]      
Disclosure of geographical areas [line items]      
Lease agreements of average term 5 years    
Lease agreement of land for the installation and operation of service stations [member]      
Disclosure of geographical areas [line items]      
Lease agreements of average term 10 years