v3.26.1
Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
MBbls
Bcf
MBoe
Mboe
Mbbl
Dec. 31, 2024
USD ($)
MBbls
Bcf
Mboe
MBoe
Mbbl
Dec. 31, 2023
USD ($)
MBoe
Dec. 31, 2023
USD ($)
Bcf
Dec. 31, 2023
USD ($)
Mbbl
Dec. 31, 2023
USD ($)
Mboe
Dec. 31, 2023
USD ($)
Month
Feb. 29, 2024
MBoe
Dec. 31, 2022
USD ($)
Changes in our estimated proved reserves [line items]                  
Extension and discoveries of proved undevelopment reserves 411 220       105      
Extension and discoveries of proved development reserves 51 30       23      
Revised proved reserves 58 17       72      
As a result of economics related to changes in fields operating costs and oil and gas prices     33     69      
Proved developed reserves added due to higher average oil price | Mboe   21              
Proved reserves revisions of previous estimates related to changes in projects strategy and drilling schedules 97   73     53      
Increase in proved reserves on account of project performance | Mboe 20         35      
Proved reserves revisions of previous estimate of change due to working interest, new projects addition and production forecasts adjustments | Mboe 10         18      
Volume Of Proved Reserve For Divestment Process Of Crudeoil | MBoe               81  
Increase In Proved Reserves On Account Of Project Performance | Mboe 20         35      
Proved Reserves Revisions Of Previous Estimate Of Change Due To Working Interest New Projects Addition And Production Forecasts Adjustments | Mboe 10         18      
Property, plant and equipment $ 19,085 $ 18,736 $ 17,712 $ 17,712 $ 17,712 $ 17,712 $ 17,712    
Assets 29,439 29,391 25,035 25,035 25,035 25,035 25,035    
Mature Fields Project [Member]                  
Changes in our estimated proved reserves [line items]                  
Costs incurred of assets held for sale $ 287                
Aguada del Chanar [Member]                  
Changes in our estimated proved reserves [line items]                  
Percentage of Disposal Of Interests 49.00%                
Gross carrying amount [member]                  
Changes in our estimated proved reserves [line items]                  
Property, plant and equipment $ 51,552 52,404 75,168 75,168 75,168 75,168 75,168   $ 70,064
Accumulated depreciation and amortisation [member]                  
Changes in our estimated proved reserves [line items]                  
Property, plant and equipment 31,626 32,948 $ 54,636 $ 54,636 $ 54,636 $ 54,636 $ 54,636   $ 51,803
Classification of assets as held for sale [member] | Mature Fields Project [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                
Classification of assets as held for sale [member] | Gross carrying amount [member] | Mature Fields Project [Member]                  
Changes in our estimated proved reserves [line items]                  
Property, plant and equipment   28,478              
Classification of assets as held for sale [member] | Gross carrying amount [member] | Aguada del Chanar [Member]                  
Changes in our estimated proved reserves [line items]                  
Property, plant and equipment 380                
Classification of assets as held for sale [member] | Gross carrying amount [member] | Optimization plan [Member]                  
Changes in our estimated proved reserves [line items]                  
Property, plant and equipment 4,630                
Classification of assets as held for sale [member] | Accumulated depreciation and amortisation [member] | Mature Fields Project [Member]                  
Changes in our estimated proved reserves [line items]                  
Property, plant and equipment   $ 24,834              
Classification of assets as held for sale [member] | Accumulated depreciation and amortisation [member] | Aguada del Chanar [Member]                  
Changes in our estimated proved reserves [line items]                  
Property, plant and equipment 74                
Classification of assets as held for sale [member] | Accumulated depreciation and amortisation [member] | Optimization plan [Member]                  
Changes in our estimated proved reserves [line items]                  
Property, plant and equipment $ 3,879                
Top of range [member]                  
Changes in our estimated proved reserves [line items]                  
Increase Decrease in total proved reserve 3.00%                
Golfo San Jorge basin [Member]                  
Changes in our estimated proved reserves [line items]                  
Proved developed and undeveloped reserves improved recovery energy | MBoe 41 11 17            
Sierra Chata, La Escalonada and Rincón de la Ceniza                  
Changes in our estimated proved reserves [line items]                  
Proved developed and undeveloped reserves improved recovery energy | MBoe 12                
Crude oil [Member]                  
Changes in our estimated proved reserves [line items]                  
Extension and discoveries of proved undevelopment reserves | Mbbl 250 81     64        
Extension and discoveries of proved development reserves 36 18     11        
Revised proved reserves 38 10     63        
Proved developed reserves added due to higher average oil price | MBbls   7              
Proved reserves revisions of previous estimates related to changes in projects strategy and drilling schedules | MBbls 49 4              
Increase Decrease in estimated reserve 10.00%                
Increase Decrease in total proved reserve 1.30%                
Increase in proved reserves on account of project performance | MBbls 5                
Proved reserves revisions of previous estimate of change due to working interest, new projects addition and production forecasts adjustments | MBbls 8                
Increase In Proved Reserves On Account Of Project Performance | MBbls 5                
Proved Reserves Revisions Of Previous Estimate Of Change Due To Working Interest New Projects Addition And Production Forecasts Adjustments | MBbls 8                
Natural Gas Liquids [Member]                  
Changes in our estimated proved reserves [line items]                  
Extension and discoveries of proved undevelopment reserves 15 11       7      
Extension and discoveries of proved development reserves | MBbls 1 1              
Revised proved reserves 6 1     5        
As a result of economics related to changes in fields operating costs and oil and gas prices | Month             43    
Proved developed reserves added due to higher average oil price | MBbls   4              
Proved reserves revisions of previous estimates related to changes in projects strategy and drilling schedules 2 9     36        
Increase in proved reserves on account of project performance 3       16        
Proved reserves revisions of previous estimate of change due to working interest, new projects addition and production forecasts adjustments | Mbbl         8        
Increase In Proved Reserves On Account Of Project Performance 3       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 (819) 717   192          
Extension and discoveries of proved development reserves | Bcf (80) 63   66          
Revised proved reserves | Bcf 148 144   80          
As a result of economics related to changes in fields operating costs and oil and gas prices | Mboe           26      
Proved developed reserves added due to higher average oil price | Bcf   58              
Proved reserves revisions of previous estimates related to changes in projects strategy and drilling schedules 278 385       19      
Increase Decrease in estimated reserve 10.00%                
Increase Decrease in total proved reserve 1.20%                
Increase in proved reserves on account of project performance 64         19      
Proved reserves revisions of previous estimate of change due to working interest, new projects addition and production forecasts adjustments 14 2       10      
Increase In Proved Reserves On Account Of Project Performance 64         19      
Proved Reserves Revisions Of Previous Estimate Of Change Due To Working Interest New Projects Addition And Production Forecasts Adjustments 14 2       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 1.60%