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Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2020
MMBbls
Bcf
MMBoe
Rate
Dec. 31, 2019
MMBbls
Bcf
MMBoe
Dec. 31, 2018
MMBbls
Bcf
MMBoe
Changes in our estimated proved reserves [line items]      
Extension and discoveries of proved development reserves 6 32 25
Extension and discoveries of proved undevelopment reserves 85 137 149
Net proved reserves of oil equivalent, Improved recovery   8 15
Revised proved reserves 61 7 156
Proved developed reserves added due to higher average oil price (61) (10) 143
Proved undeveloped reserves revisions of previous estimates of economic conditions increases-decreases     48
Proved developed reserves revisions of previous estimates increases by liquids and gas production performance 38 33 33
Proved reserves revisions of previous estimates of change of development strategy   42 43
Net proved reserves of sales and acquisition 11 3 1.4
Selling exchange rate | Rate 84.05    
Vaca Muerta Development Project [Member]      
Changes in our estimated proved reserves [line items]      
Proved reserves revisions of previous estimates of change of development strategy   19  
Golfo San Jorge basin [Member]      
Changes in our estimated proved reserves [line items]      
Proved developed reserves of oil equivalent, Improved reserves   2 4.4
Proved developed reserves added due to higher average oil price     40
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases     33
Neuquina basin [Member]      
Changes in our estimated proved reserves [line items]      
Proved developed reserves of oil equivalent, Improved reserves   5 3
Proved undeveloped reserves of oil equivalent, Improved reserves     3
Proved developed reserves added due to higher average oil price     56
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases     15
Proved reserves revisions of previous estimates of change of development strategy 37    
Reduction of proved undeveloped reserves due to changes in gas compression projects     5
Net production results and forecasts from existing and new wells     13
Austral, Golfo San Jorge and Cuyana basins [member]      
Changes in our estimated proved reserves [line items]      
Proved undeveloped reserves reduction     5
Golfo San Jorge And Neuquina Basins [member]      
Changes in our estimated proved reserves [line items]      
Proved undeveloped reserves reduction   6  
Crude oil [Member]      
Changes in our estimated proved reserves [line items]      
Extension and discoveries of proved development reserves | MMBbls 4 11 8
Extension and discoveries of proved undevelopment reserves | MMBbls 42 76 95
Revised proved reserves | MMBbls 93 21 126
Natural Gas Liquids [Member]      
Changes in our estimated proved reserves [line items]      
Extension and discoveries of proved development reserves | MMBbls   2 1
Extension and discoveries of proved undevelopment reserves | MMBbls 9 12 12
Revised proved reserves | MMBbls 8 4 1
Natural gas [member]      
Changes in our estimated proved reserves [line items]      
Extension and discoveries of proved development reserves | Bcf 9 107 92
Extension and discoveries of proved undevelopment reserves | Bcf 189 276 238
Revised proved reserves | Bcf 136 103 178
Austral basin [Member]      
Changes in our estimated proved reserves [line items]      
Proved developed reserves added due to higher average oil price     31
Cuyana basin [Member]      
Changes in our estimated proved reserves [line items]      
Proved developed reserves of oil equivalent, Improved reserves   1