v3.26.1
Property Plant and Equipment - Summary of Changes in Property Plant and Equipment (Parenthetical) (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
well
Well
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 23, 2024
well
Disclosure of detailed information about property, plant and equipment [line items]        
Mineral property $ 293 $ 144 $ 269  
Exploratory wells in progress | well 12      
Drilled wells | Well 12      
Charged to exploratory expense | well 2      
Transferred to proved properties | well       8
Net book value charged to Property, plant and equipment provisions $ 20 2 4  
Increase/(Decrease) of cost of Property, plant and equipment (219) 169 507  
Depreciation of property plant and equipment [1] 2,857 2,446 3,016  
Cost increases of short-term leases 9 31 57  
Cost increases of variable charge of leases related to the underlying asset return/use 14 21 6  
Capitalization of depreciation of right-of-use assets 57 61 68  
Capitalization of financial accretion for lease liabilities 8 10 13  
Mature Fields Project [Member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Reclassification of assets held for disposal 28,586      
Mature Fields Project [Member] | Accumulated depreciation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Reclassification of assets held for disposal 24,915      
Aguada del Chanar [Member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Reclassification of assets held for disposal 380      
Aguada del Chanar [Member] | Accumulated depreciation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Reclassification of assets held for disposal 74      
Optimization plan [Member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Reclassification of assets held for disposal 4,630      
Optimization plan [Member] | Accumulated depreciation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Reclassification of assets held for disposal $ 3,879      
Hydrocarbon Wells Abandonmnet [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Depreciation of property plant and equipment   $ 82 $ 13  
[1] Includes depreciation of charges for impairment of property, plant and equipment.