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Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
MBoe
MBbls
Bcf
Mbbl
Integer
Dec. 31, 2023
USD ($)
MBoe
Mboe
Mbbl
Bcf
Dec. 31, 2022
USD ($)
Mboe
Bcf
Mbbl
MBoe
Feb. 29, 2024
MBoe
Dec. 31, 2021
USD ($)
Changes in our estimated proved reserves [line items]          
Extension and discoveries of proved undevelopment reserves 220 105 288    
Extension and discoveries of proved development reserves 30 23 34    
Revised proved reserves 17 72 87    
As a result of economics related to changes in fields operating costs and oil and gas prices   69 55    
Proved reserves revisions of previous estimates related to changes in projects strategy and drilling schedules 73 53 46    
Increase in proved reserves on account of project performance 21 35      
Proved reserves revisions of previous estimate of change due to working interest, new projects addition and production forecasts adjustments 2 18      
Volume Of Proved Reserve For Divestment Process Of Crudeoil       85  
Approximate Volume Of Proved Reserve Remaining Blocks 37        
Number Of Assignment To New Operators | Integer 3        
As A Result Of Economics Related To Changes In Fields Operating Costs And Oil And Gas Prices   69 55    
Increase In Proved Reserves On Account Of Project Performance 21 35      
Proved Reserves Revisions Of Previous Estimate Of Change Due To Working Interest New Projects Addition And Production Forecasts Adjustments 2 18      
Property, plant and equipment | $ $ 18,736 $ 17,712 $ 17,510    
Assets | $ 29,391 25,035 25,912    
Mature Fields Project [Member]          
Changes in our estimated proved reserves [line items]          
Costs incurred of assets held for sale | $ 287        
Mature Fields Project [Member] | Classification of assets as held for sale [member]          
Changes in our estimated proved reserves [line items]          
Provision on impairment loss recognized in profit or loss property plant and equipment classified held for sale. | $ 1,893        
Assets | $ 1,497        
Accumulated depreciation and amortisation [member]          
Changes in our estimated proved reserves [line items]          
Property, plant and equipment | $ 32,948 54,636 51,803   $ 49,043
Accumulated depreciation and amortisation [member] | Mature Fields Project [Member] | Classification of assets as held for sale [member]          
Changes in our estimated proved reserves [line items]          
Property, plant and equipment | $ 24,834        
Gross carrying amount [member]          
Changes in our estimated proved reserves [line items]          
Property, plant and equipment | $ 52,404 $ 75,168 $ 70,064   $ 65,820
Gross carrying amount [member] | Mature Fields Project [Member] | Classification of assets as held for sale [member]          
Changes in our estimated proved reserves [line items]          
Property, plant and equipment | $ $ 28,478        
Top of range [member]          
Changes in our estimated proved reserves [line items]          
Increase Decrease in total proved reserve 6.00%        
Golfo San Jorge basin [Member]          
Changes in our estimated proved reserves [line items]          
Proved developed and undeveloped reserves improved recovery energy 11 17 7    
Neuquina basin [Member]          
Changes in our estimated proved reserves [line items]          
Proved reserves revisions of previous estimates related to changes in projects strategy and drilling schedules     15    
Proved reserves revisions of previous estimates of change of development strategy     4    
Crude oil [Member]          
Changes in our estimated proved reserves [line items]          
Extension and discoveries of proved undevelopment reserves | Mbbl 81 64 120    
Extension and discoveries of proved development reserves 18 11 5    
Revised proved reserves 10 63 72    
Proved reserves revisions of previous estimates related to changes in projects strategy and drilling schedules | MBbls 4        
Increase Decrease in estimated reserve 10.00%        
Increase Decrease in total proved reserve 2.50%        
Increase in proved reserves on account of project performance | MBbls 7        
Increase In Proved Reserves On Account Of Project Performance | MBbls 7        
Natural Gas Liquids [Member]          
Changes in our estimated proved reserves [line items]          
Extension and discoveries of proved undevelopment reserves | Mbbl 11 7 24    
Extension and discoveries of proved development reserves 1   3    
Revised proved reserves 1 5 1    
As a result of economics related to changes in fields operating costs and oil and gas prices | Mbbl   43      
Proved reserves revisions of previous estimates related to changes in projects strategy and drilling schedules 9 36      
Increase in proved reserves on account of project performance 4 16      
Proved reserves revisions of previous estimate of change due to working interest, new projects addition and production forecasts adjustments | Mbbl   8      
As A Result Of Economics Related To Changes In Fields Operating Costs And Oil And Gas Prices | Mbbl   43      
Increase In Proved Reserves On Account Of Project Performance 4 16      
Proved Reserves Revisions Of Previous Estimate Of Change Due To Working Interest New Projects Addition And Production Forecasts Adjustments | Mbbl   8      
Natural gas [member]          
Changes in our estimated proved reserves [line items]          
Extension and discoveries of proved undevelopment reserves | Bcf 717 192 808    
Extension and discoveries of proved development reserves | Bcf 63 66 144    
Revised proved reserves | Bcf 144 80 91    
As a result of economics related to changes in fields operating costs and oil and gas prices 33 26      
Proved reserves revisions of previous estimates related to changes in projects strategy and drilling schedules 385 19      
Increase Decrease in estimated reserve 10.00%        
Increase Decrease in total proved reserve 0.60%        
Increase in proved reserves on account of project performance 58 19      
Proved reserves revisions of previous estimate of change due to working interest, new projects addition and production forecasts adjustments   10      
As A Result Of Economics Related To Changes In Fields Operating Costs And Oil And Gas Prices 33 26      
Increase In Proved Reserves On Account Of Project Performance 58 19      
Proved Reserves Revisions Of Previous Estimate Of Change Due To Working Interest New Projects Addition And Production Forecasts Adjustments   10      
Crude Oil And Natural Gas [Member]          
Changes in our estimated proved reserves [line items]          
Increase Decrease in estimated reserve 10.00%        
Increase Decrease in total proved reserve 3.10%