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Right-of-use Assets -Summary of Evolution of the Group's Right-of-use Assets (Parenthetical) (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation of right-of-use assets $ 17,873 $ 10,509
Capitalization of amortization of right-of-use assets in property, plant and equipment 3,789 $ 2,021
Cost [member] | Machinery and equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Cost decrease due to liquefaction barge with exmar (21,103)  
Accumulated depreciation [member] | Machinery and equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Cost decrease due to liquefaction barge with exmar $ (2,110)