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Inventories - Summary of Inventories (Detail) - ARS ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of inventories [line items]        
Inventories $ 100,137 $ 80,479 $ 53,324 $ 27,149
Refined products [member]        
Disclosure of inventories [line items]        
Inventories 59,971 50,563 33,583  
Crude oil and natural gas [member]        
Disclosure of inventories [line items]        
Inventories 33,066 24,756 14,571  
Products in process [member]        
Disclosure of inventories [line items]        
Inventories 1,966 2,259 1,177  
Raw materials, packaging materials and others [member]        
Disclosure of inventories [line items]        
Inventories $ 5,134 $ 2,901 $ 3,993