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Basis of Preparation of the Consolidated Financial Statements - Additional Information (Detail) - ARS ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 20, 2020
Mar. 31, 2019
Feb. 28, 2021
Mar. 31, 2020
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Use of estimates               The preparation of financial statements at a certain date requires the Management to make estimates and assessments affecting the amount of assets and liabilities recorded, contingent assets and liabilities disclosed at such date, as well as income and expenses recorded during the fiscal year. Future results might differ from the estimates and assessments made on the date of preparation of these consolidated financial statements.        
Consolidation policies               This capacity is, in general but not solely, obtained by the direct or indirect ownership of more than 50% of the voting shares of a company.​​​​​​​        
Maximum accumulated inflation rate               In recent years, inflation in Argentina has been high, with an accumulated inflation rate exceeding 100% over the last three years.        
Description of significant influence in associates               Associates are considered those in respect of which the Group has significant influence, understood as the power to participate in the financial and operating policy decisions of the investee but does not have control or joint control over those policies. Significant influence is presumed in companies in which a company has an interest of 20% or more and less than 50%.        
Useful life of cash generating units               5 years        
General tax rate               30.00% 30.00% 30.00% 35.00%  
Personal assets tax rate               0.50%        
Shareholders equity attributable to shareholders of the parent company           $ 683,395   $ 683,395 $ 548,099 $ 362,357 $ 152,533  
Right-of-use assets           $ 44,081   44,081 61,391      
Expense for short term and low value leases               $ 11,764 13,886      
Discount rate after taxes of the CGU Oil           12.85%   12.85%        
Assets classified as disposal group held for sale           $ 494   $ 494 $ 0 3,189    
Real estate classified as inventories [member] | Argentina [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of revaluation special tax               15.00%        
Real estate not classified as inventories [member] | Argentina [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of revaluation special tax               8.00%        
Quotas and equity interests [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of revaluation special tax               5.00%        
Rest of assets [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of revaluation special tax               10.00%        
Remaining Lease Commitments [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Right-of-use assets                       $ 23,059
Gasoline [Member] | COVID-19 [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of decrease in demand   70.00%   7.00%                
Diesel [member] | COVID-19 [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of decrease in demand   40.00%                    
Jet fuel [member] | COVID-19 [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of decrease in demand   90.00%   70.00%                
Scenario Forecast [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
General tax rate 25.00%   30.00%   25.00%     25.00% 30.00%      
Legal reserve [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Shareholders equity attributable to shareholders of the parent company           $ 2,007   $ 2,007 $ 2,007 2,007 $ 2,007  
Metrogas S.A. [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of non-controlling interest acquired           30.00%   30.00%        
YTEC [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of non-controlling interest acquired           49.00%   49.00%        
Not later than one year [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Discount rate after taxes of the CGU Oil                 12.14%      
Later than one year [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Discount rate after taxes of the CGU Oil           12.14%   12.14%        
Later than one year and not later than two years [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Discount rate after taxes of the CGU Oil           13.12%   13.12% 12.14%      
Later than two years and not later than three years [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Discount rate after taxes of the CGU Oil                 12.39%      
CGU OIL [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Recoverable value of assets after tax                   254,549    
Reversal in the charge for impairment                   $ 39,837    
Discount rate after taxes of the CGU Oil                   10.94%    
CGU OIL [member] | Scenario Forecast [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Discount rate after taxes of the CGU Oil           11.19%   11.19%        
CGU Gas Neuquina Basin [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Recoverable value of assets after tax           $ 192,197   $ 192,197 $ 139,361 $ 108,509    
Impairment loss           58,463 $ (49,170)   (40,561) (28,326)    
Impairment Loss Recognised In Profit Or Loss Property Plant And Equipment,Net of tax           43,848 (36,877)   $ (30,421)      
CGU Gas Austral Basin [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Recoverable value of assets after tax           16,036   $ 16,036   8,606    
Impairment loss           7,706 (8,126)     $ (8,246)    
Impairment Loss Recognised In Profit Or Loss Property Plant And Equipment,Net of tax           $ 5,780 $ (6,095)          
Bottom of range [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Useful lives of amortized assets               3 years        
Percentage of defined contribution plan               3.00%        
Bottom of range [member] | Legal reserve [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of legal reserve transferred               5.00%        
Top of range [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Useful lives of amortized assets               15 years        
Percentage of defined contribution plan               10.00%        
Top of range [member] | Legal reserve [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Maximum legal reserve of subscribed Capital plus adjustment to contribution               20.00%        
Consolidated entities [Member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Investment Owned Percent Of Net Assets               100.00%        
Taxes, withholdings and royalties [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Minimum presumed income tax rate               1.00% 1.00% 1.00%    
Royalties and withholding systems for hydrocarbon exports [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of interest on royalty               12.00%        
Royalties and withholding systems for hydrocarbon exports [member] | Crude oil and natural gas [member]                        
Disclosure of estimated useful life of the Property, plant and equipment [line items]                        
Percentage of interest on royalty               15.00%