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Basis of Preparation of the Consolidated Financial Statements - Additional Information (Detail)
$ in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2016
Oct. 31, 2016
Sep. 30, 2016
Aug. 31, 2016
Dec. 31, 2020
ARS ($)
Dec. 31, 2019
ARS ($)
Dec. 31, 2018
ARS ($)
Cash_Generating_Units
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
ARS ($)
Dec. 31, 2015
ARS ($)
Jan. 01, 2019
ARS ($)
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Current and non-current classification             The presentation in the statement of financial position makes a distinction between current and non-current assets and liabilities, according to the activities operating cycle.Current assets and liabilities include assets and liabilities, which are realized or settled within the 12-month period from the end of the fiscal year.        
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.        
Service concessions arrangements             The Argentine Hydrocarbons Law allows the executive branch of the Argentine government to award 35-year concessions for the transportation of oil, gas and petroleum products following submission of competitive bids. The term of a transportation concession may be extended for an additional ten-year term.        
Description of significant influence in associates             Associates are considered those in 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             10 years        
General tax rate             30.00% 35.00% 35.00%    
Personal assets tax rate               0.25% 0.25% 0.25%  
Shareholders equity attributable to shareholders of the parent company             $ 362,357 $ 152,533 $ 118,661 $ 120,461  
Expected decrease in net profit after tax for fiscal year 2019             541        
Expected increase in operating activities             9,224        
Percentage of reduction in domestic crude oil price per barrel 6.00% 2.00% 2.00% 2.00%         10.00%    
Impairment charge for property, plant and equipment                 $ 34,943    
Discount rate after taxes of the CGU Oil                 8.67%    
Recoverable value of assets after tax of the CGU Oil             82,802   $ 71,495    
Reversal for impairment of value of assets             2,900 $ 5,032      
Discount rate after taxes               8.28%      
Remaining Lease Commitments [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Right-of-use assets                     $ 23,059
Lease liabilities                     $ 23,059
Non adjusting event [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Recoverable value of assets after tax of the CGU Oil         $ 82,802 $ 82,802          
Discount rate after taxes         8.42% 8.28%          
Scenario Forecast [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
General tax rate         25.00% 30.00%          
Legal reserve [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Shareholders equity attributable to shareholders of the parent company             $ 2,007 $ 2,007 $ 2,007 $ 2,007  
Upstream segment [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Number of cash generating units | Cash_Generating_Units             4        
Gas and power segment [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Number of cash generating units | Cash_Generating_Units             3        
Metrogas S.A. [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Percentage of non-controlling interest acquired             30.00%        
YTEC [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Percentage of non-controlling interest acquired             49.00%        
Later than one year [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Discount rate after taxes of the CGU Oil             10.94%        
Later than two years and THERE AFTER [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Discount rate after taxes of the CGU Oil             11.19%        
Crude Oil Reserves [member] | Upstream segment [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Number of cash generating units | Cash_Generating_Units             1        
Natural gas reserves [member] | Upstream segment [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Number of cash generating units | Cash_Generating_Units             3        
CGU OIL [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Recoverable value of assets after tax of the CGU Oil             $ 254,549        
Reversal in the charge for impairment             39,837        
CGU Gas Neuquina Basin [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Impairment charge for property, plant and equipment             28,326        
Recoverable value of assets after tax of the CGU Oil             108,509        
CGU Gas Austral Basin [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Impairment charge for property, plant and equipment             8,246        
Recoverable value of assets after tax of the CGU Oil             $ 8,606        
Bottom of range [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Useful lives of amortized assets             3 years        
Percentage of interest in investee             20.00%        
Percentage of defined contribution plan             3.00%        
Bottom of range [member] | Legal reserve [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Percentage of legal reserve transferred             5.00%        
Top of range [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Useful lives of amortized assets             14 years        
Percentage of interest in investee             50.00%        
Percentage of defined contribution plan             10.00%        
Top of range [member] | Legal reserve [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Maximum legal reserve of subscribed Capital plus adjustment to contribution             20.00%        
Consolidated entities [Member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
Investment Owned Percent Of Net Assets             100.00%        
Taxes, withholdings and royalties [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
General tax rate             30.00% 35.00%      
Minimum presumed income tax rate               1.00% 1.00% 1.00%  
Taxes, withholdings and royalties [member] | Scenario Forecast [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [line items]                      
General tax rate         25.00% 30.00%          
Royalties and withholding systems for hydrocarbon exports [member]                      
Disclosure of assets and liabilities with significant risk of material adjustment [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 assets and liabilities with significant risk of material adjustment [line items]                      
Percentage of interest on royalty             15.00%