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Inventories - Summary of Inventories (Detail) - ARS ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of inventories [line items]        
Inventories $ 27,291 $ 21,820 $ 19,258 $ 13,001
Refined products [member]        
Disclosure of inventories [line items]        
Inventories 16,260 13,390 10,709  
Crude oil and natural gas [member]        
Disclosure of inventories [line items]        
Inventories 8,474 6,551 7,155  
Products in process [member]        
Disclosure of inventories [line items]        
Inventories 640 411 169  
Construction works in progress for third parties [member]        
Disclosure of inventories [line items]        
Inventories 142 12 85  
Raw materials, packaging materials and others [member]        
Disclosure of inventories [line items]        
Inventories $ 1,775 $ 1,456 $ 1,140