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Supplementary Oil and Gas Information (Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves-Before Discounting) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future Cash Inflows $ 56,558 $ 59,244 $ 67,643  
Production costs 20,237 19,081 22,552  
Development costs 9,899 11,806 11,113  
Income taxes 3,197 3,784 4,751  
Future Net Cash Flows 23,225 24,573 29,227  
Less 10% annual discount for estimated timing of cash flows 10,311 10,901 13,145  
Discounted Future Net Cash Flows 12,914 13,672 16,082 $ 27,499
United States [Member]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future Cash Inflows 41,435 52,682 47,946  
Production costs 12,732 15,122 14,405  
Development costs 6,895 10,269 8,849  
Income taxes 3,042 3,690 2,735  
Future Net Cash Flows 18,766 23,601 21,957  
Less 10% annual discount for estimated timing of cash flows 8,871 10,741 10,182  
Discounted Future Net Cash Flows 9,895 12,860 11,775 18,968
Canada [Member]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future Cash Inflows 15,123 6,562 19,697  
Production costs 7,505 3,959 8,147  
Development costs 3,004 1,537 2,264  
Income taxes 155 94 2,016  
Future Net Cash Flows 4,459 972 7,270  
Less 10% annual discount for estimated timing of cash flows 1,440 160 2,963  
Discounted Future Net Cash Flows $ 3,019 $ 812 $ 4,307 $ 8,531