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Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2021
MMBoe
Bcf
MMBbls
Rate
Dec. 31, 2020
MMBoe
Bcf
MMBbls
Dec. 31, 2019
Bcf
MMBoe
MMBbls
Changes in our estimated proved reserves [line items]      
Extension and discoveries of proved development reserves 27 6 32
Extension and discoveries of proved undevelopment reserves 148 85 137
Net proved reserves of oil equivalent, Improved recovery     8
Proved developed reserves of sales and acquisition   11  
Revised proved reserves 217 61 7
Proved developed reserves added due to higher average oil price 186    
Proved developed reserves revisions of previous estimates increases by liquids and gas production performance 44 38 33
Proved reserves revisions of previous estimates of change of development strategy     42
Net proved reserves of sales and acquisition     3
Proved developed reserves reduced due to lower average oil price   61 10
Selling exchange rate | Rate 102.62    
Top of range [member]      
Changes in our estimated proved reserves [line items]      
Increase Decrease in total proved reserve 5    
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 5   2
Neuquina basin [Member]      
Changes in our estimated proved reserves [line items]      
Proved developed reserves of oil equivalent, Improved reserves     5
Proved reserves revisions of previous estimates of change of development strategy 17 37  
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 3 4 11
Extension and discoveries of proved undevelopment reserves | MMBbls 73 42 76
Revised proved reserves | MMBbls 161 93 21
Increase Decrease in estimated reserve 10    
Increase Decrease in total proved reserve 1    
Natural Gas Liquids [Member]      
Changes in our estimated proved reserves [line items]      
Extension and discoveries of proved development reserves | MMBbls 3   2
Extension and discoveries of proved undevelopment reserves | MMBbls 16 9 12
Revised proved reserves | MMBbls 6 8 4
Natural gas [member]      
Changes in our estimated proved reserves [line items]      
Extension and discoveries of proved development reserves | Bcf 116 9 107
Extension and discoveries of proved undevelopment reserves | Bcf 334 189 276
Revised proved reserves | Bcf 347 136 103
Increase Decrease in estimated reserve 10    
Increase Decrease in total proved reserve 1    
Cuyana basin [Member]      
Changes in our estimated proved reserves [line items]      
Proved developed reserves of oil equivalent, Improved reserves     1
Crude Oil And Natural Gas [Member]      
Changes in our estimated proved reserves [line items]      
Increase Decrease in estimated reserve 10    
Increase Decrease in total proved reserve 2