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Income Tax - Summary of Reconciliation between the Charge to Net Income for Income Tax and the One that would Result from Applying the Prevailing Tax Rate on Net Income Before Income Tax Arising from the Consolidated Statements of Comprehensive Income (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Net income before income tax $ (56,428) $ (7,010) $ 90,144  
Statutory tax rate 30.00% 30.00% 30.00% 35.00%
Statutory tax rate applied to net income before income tax $ 16,928 $ 2,103 $ (27,043)  
Effect of the valuation of property, plant and equipment and intangible assets measured in functional currency (62,218) (20,189) (100,760)  
Exchange differences 24,242 22,553 67,767  
Effect of the valuation of inventories (11,102) (11,553) (8,666)  
Income on investments in associates and joint ventures 3,981 2,390 1,452  
Effect by change of tax rate 4,286 1,956 12,795  
Dispute associated to cost deduction for hydrocarbon wells abandonment   (5,175)    
Interest related to the payment facility plan for the dispute associated to cost deduction for hydrocarbon wells abandonment (657) 1,333    
Result of companies' revaluation     3,594  
Miscellaneous 3,541 1,056 (677)  
Income tax $ (20,999) $ (5,526) $ (51,538)