v3.26.1
Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]          
Rate of capitalization     7.10% 7.22% 7.89%
Amount capitalized     $ 14 $ 6 $ 17
Discount rate after taxes of the CGU Gas - Neuquina   14.89% 15.00% 14.80% 15.00%
CGU Gas Neuquina Basin [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Book value of the net assets       $ 2,769 $ 2,400
CGU Gas Austral Basin [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Impairment loss $ 506        
Impairment Loss Recognised In Profit Or Loss Property Plant And Equipment,Net of tax   $ 329      
CGU Oil CGU Gas Austral Basin And CGU Gas Neuquina Basin [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Impairment loss       1,782  
Impairment Loss Recognised In Profit Or Loss Property Plant And Equipment,Net of tax         $ 1,158
CGU Gas Northwest Basin [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Impairment loss       58  
Impairment Loss Recognised In Profit Or Loss Property Plant And Equipment,Net of tax       37  
Recoverable value after taxes       $ 28  
CGU Gas Cuenca Neuquina [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Net assets     $ 2,804    
CGU Gas Cuenca Noroeste [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Net assets     $ 9