v3.26.1
Supplementary information on oil and gas activities (unaudited) - Summary of estimated oil and natural gas proved reserves and technical volumes (Detail) - Proved Reserves [Member]
Dec. 31, 2025
MMBbls
Bcf
Dec. 31, 2024
Bcf
MMBbls
Dec. 31, 2023
MMBbls
Bcf
Dec. 31, 2022
MMBbls
Bcf
Mexico [member] | Crude oil, condensate and natural gas liquids [Member]        
Disclosure Of Estimated Oil And Natural Gas Proved Reserves And Technical Volumes [Line Items]        
Proved Developed [1] 0 [2] 2.1 1.8 0.2
Proved Undeveloped [1] 0 [2] 5.3 5.5 2.7
Total proved reserves (developed and undeveloped) [1] 0 [2] 7.4 7.3 2.9
Mexico [member] | Consumption plus Natural gas sales in BCF [Member]        
Disclosure Of Estimated Oil And Natural Gas Proved Reserves And Technical Volumes [Line Items]        
Proved Developed | Bcf 0 [1],[2] 4 4.5 0.1
Proved Undeveloped | Bcf 0 [1],[2] 9.4 11.4 5.9
Total proved reserves (developed and undeveloped) | Bcf 0 [1],[2] 13.4 15.9 6
Mexico [member] | Consumption plus Natural gas sales in MMBBL [Member]        
Disclosure Of Estimated Oil And Natural Gas Proved Reserves And Technical Volumes [Line Items]        
Proved Developed 0 [1],[2] 0.7 0.8 0
Proved Undeveloped 0 [1],[2] 1.7 2 1.1
Total proved reserves (developed and undeveloped) 0 [1],[2] 2.4 2.8 1.1
Argentina [Member] | Crude oil, condensate and natural gas liquids [Member]        
Disclosure Of Estimated Oil And Natural Gas Proved Reserves And Technical Volumes [Line Items]        
Proved Developed [1] 208.4 107 71 68.3
Proved Undeveloped [1] 314.7 208.2 191.3 136.8
Total proved reserves (developed and undeveloped) [1] 523.1 [3] 315.2 [3] 262.3 [3] 205.1
Argentina [Member] | Consumption plus Natural gas sales in BCF [Member]        
Disclosure Of Estimated Oil And Natural Gas Proved Reserves And Technical Volumes [Line Items]        
Proved Developed | Bcf 135.2 109 85.5 99.2
Proved Undeveloped | Bcf 230.2 173.2 173.3 139.7
Total proved reserves (developed and undeveloped) | Bcf 365.3 [3] 282.2 [3] 258.8 [3] 238.9
Argentina [Member] | Consumption plus Natural gas sales in MMBBL [Member]        
Disclosure Of Estimated Oil And Natural Gas Proved Reserves And Technical Volumes [Line Items]        
Proved Developed 24.1 19.4 15.2 17.7
Proved Undeveloped 41 30.8 30.9 24.8
Total proved reserves (developed and undeveloped) 65 [3] 50.2 [3] 46.1 [3] 42.5
[1] It refers to crude oil, condensate, and LPG.
[2] See Note 1.1.
[3] Reserves included in this note have been rounded for ease of presentation. For this reason, certain calculations may have nonmaterial differences in the sums.