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Supplementary Oil and Gas Information (Capitalized Costs) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]      
Proved Oil and Gas Properties $ 70,133 $ 66,009 $ 64,084
Unproved Oil and Gas Properties 434 764 1,486
Total Capital Cost 70,567 66,773 65,570
Accumulated DD&A 56,457 52,591 51,131
Net Capitalized Costs 14,110 14,182 14,439
United States [Member]      
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]      
Proved Oil and Gas Properties 50,573 50,246 47,440
Unproved Oil and Gas Properties 316 741 1,449
Total Capital Cost 50,889 50,987 48,889
Accumulated DD&A 39,294 37,770 35,799
Net Capitalized Costs 11,595 13,217 13,090
Canada [Member]      
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]      
Proved Oil and Gas Properties 19,560 15,763 16,644
Unproved Oil and Gas Properties 118 23 37
Total Capital Cost 19,678 15,786 16,681
Accumulated DD&A 17,163 14,821 15,332
Net Capitalized Costs $ 2,515 $ 965 $ 1,349