v3.26.1
Supplementary Oil And Gas Information (Unaudited) - Proved and Proved Developed Oil and Natural Gas Liquids, Net of Royalties (Details) - MMBbls
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Proved Developed And Undeveloped Reserves [Roll Forward]        
Sales of reserves in place (in MMbbl)   (2)    
Synthetic Crude Oil | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 6,313 5,840 5,390  
Extensions and discoveries (in MMbbl/Bcf) 0 0 162  
Improved recovery (in MMbbl/Bcf) 1 1 28  
Purchases of reserves in place (in MMbbl/Bcf) 0 701 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (167) (141) (141)  
Economic revisions due to prices (in MMbbl/Bcf) 17 (106) 333  
Revisions of prior estimates (in MMbbl/Bcf) (261) 18 68  
Proved reserves, net, ending balance 5,903 6,313 5,840  
Net proved developed reserves (in MMbbl/Bcf) 5,855 6,268 5,804 5,389
Bitumen | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 2,676 2,669 2,546  
Extensions and discoveries (in MMbbl/Bcf) 58 62 67  
Improved recovery (in MMbbl/Bcf) 21 7 9  
Purchases of reserves in place (in MMbbl/Bcf) 336 1 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (112) (101) (102)  
Economic revisions due to prices (in MMbbl/Bcf) 155 (38) 123  
Revisions of prior estimates (in MMbbl/Bcf) 309 77 26  
Proved reserves, net, ending balance 3,443 2,676 2,669  
Net proved developed reserves (in MMbbl/Bcf) 1,326 629 610 582
Crude Oil | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 356 325 321  
Extensions and discoveries (in MMbbl/Bcf) 13 13 14  
Improved recovery (in MMbbl/Bcf) 4 2 7  
Purchases of reserves in place (in MMbbl/Bcf) 57 7 0  
Sales of reserves in place (in MMbbl) 0 (1) 0  
Production (in MMbbl) (31) (26) (27)  
Economic revisions due to prices (in MMbbl/Bcf) 10 0 10  
Revisions of prior estimates (in MMbbl/Bcf) 10 37 (2)  
Proved reserves, net, ending balance 420 356 325  
Net proved developed reserves (in MMbbl/Bcf) 258 232 225 238
Natural Gas Liquids (NGL) | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 547 442 375  
Extensions and discoveries (in MMbbl/Bcf) 7 18 37  
Improved recovery (in MMbbl/Bcf) 32 10 30  
Purchases of reserves in place (in MMbbl/Bcf) 55 131 0  
Sales of reserves in place (in MMbbl) 0 (2) (1)  
Production (in MMbbl) (35) (23) (20)  
Economic revisions due to prices (in MMbbl/Bcf) 62 (34) 18  
Revisions of prior estimates (in MMbbl/Bcf) (9) 4 3  
Proved reserves, net, ending balance 660 547 442  
Net proved developed reserves (in MMbbl/Bcf) 183 127 112 121
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 9,947 9,339 8,700  
Extensions and discoveries (in MMbbl/Bcf) 78 93 280  
Improved recovery (in MMbbl/Bcf) 58 21 75  
Purchases of reserves in place (in MMbbl/Bcf) 448 839 0  
Sales of reserves in place (in MMbbl) 0 (2) (1)  
Production (in MMbbl) (349) (299) (298)  
Economic revisions due to prices (in MMbbl/Bcf) 246 (179) 485  
Revisions of prior estimates (in MMbbl/Bcf) 38 136 98  
Proved reserves, net, ending balance 10,465 9,947 9,339  
Net proved developed reserves (in MMbbl/Bcf) 7,647 7,288 6,787 6,369
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 9,892 9,276 8,632  
Extensions and discoveries (in MMbbl/Bcf) 78 93 280  
Improved recovery (in MMbbl/Bcf) 58 21 75  
Purchases of reserves in place (in MMbbl/Bcf) 448 839 0  
Sales of reserves in place (in MMbbl) 0 (2) (1)  
Production (in MMbbl) (345) (291) (289)  
Economic revisions due to prices (in MMbbl/Bcf) 244 (180) 484  
Revisions of prior estimates (in MMbbl/Bcf) 50 136 94  
Proved reserves, net, ending balance 10,425 9,892 9,276  
Net proved developed reserves (in MMbbl/Bcf) 7,622 7,256 6,752 6,330
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids | North Sea        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 6 9 11  
Extensions and discoveries (in MMbbl/Bcf) 0 0 0  
Improved recovery (in MMbbl/Bcf) 0 0 0  
Purchases of reserves in place (in MMbbl/Bcf) 0 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (3) (4) (5)  
Economic revisions due to prices (in MMbbl/Bcf) 0 0 0  
Revisions of prior estimates (in MMbbl/Bcf) (3) 1 3  
Proved reserves, net, ending balance 0 6 9  
Net proved developed reserves (in MMbbl/Bcf) 0 6 6 5
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids | Offshore Africa        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 48 54 57  
Extensions and discoveries (in MMbbl/Bcf) 0 0 0  
Improved recovery (in MMbbl/Bcf) 0 0 0  
Purchases of reserves in place (in MMbbl/Bcf) 0 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (1) (4) (4)  
Economic revisions due to prices (in MMbbl/Bcf) 1 0 1  
Revisions of prior estimates (in MMbbl/Bcf) (9) (2) 1  
Proved reserves, net, ending balance 40 48 54  
Net proved developed reserves (in MMbbl/Bcf) 25 25 30 34