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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Proved Developed And Undeveloped Reserves [Roll Forward]        
Sales of reserves in place (in MMbbl) (1)      
Synthetic Crude Oil | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 5,390 5,944 6,847  
Extensions and discoveries (in MMbbl) 162 0 0  
Improved recovery (in MMbbl) 28 29 0  
Purchases of reserves in place (in MMbbl) 0 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (141) (128) (150)  
Economic revisions due to prices (in MMbbl) 333 (455) (927)  
Revisions of prior estimates (in MMbbl) 68 0 174  
Proved reserves, net, ending balance 5,840 5,390 5,944  
Net proved developed reserves (in MMbbl) 5,804 5,389 5,929 6,770
Bitumen | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 2,546 2,289 2,413  
Extensions and discoveries (in MMbbl) 67 195 101  
Improved recovery (in MMbbl) 9 5 19  
Purchases of reserves in place (in MMbbl) 0 267 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (102) (91) (103)  
Economic revisions due to prices (in MMbbl) 123 (263) (296)  
Revisions of prior estimates (in MMbbl) 26 144 155  
Proved reserves, net, ending balance 2,669 2,546 2,289  
Net proved developed reserves (in MMbbl) 610 582 584 628
Crude Oil and NGLs       | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 696 708 525  
Extensions and discoveries (in MMbbl) 51 11 14  
Improved recovery (in MMbbl) 37 21 14  
Purchases of reserves in place (in MMbbl) 0 21 52  
Sales of reserves in place (in MMbbl) (1) 0 0  
Production (in MMbbl) (47) (45) (45)  
Economic revisions due to prices (in MMbbl) 29 (73) 108  
Revisions of prior estimates (in MMbbl) 1 54 40  
Proved reserves, net, ending balance 767 696 708  
Net proved developed reserves (in MMbbl) 337 359 370 285
Crude Oil and NGLs       | North Sea        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 11 79 87  
Extensions and discoveries (in MMbbl) 0 0 0  
Improved recovery (in MMbbl) 0 0 0  
Purchases of reserves in place (in MMbbl) 0 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (5) (5) (6)  
Economic revisions due to prices (in MMbbl) 0 1 1  
Revisions of prior estimates (in MMbbl) 3 (64) (3)  
Proved reserves, net, ending balance 9 11 79  
Net proved developed reserves (in MMbbl) 6 5 39 32
Crude Oil and NGLs       | Offshore Africa        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 57 64 71  
Extensions and discoveries (in MMbbl) 0 0 0  
Improved recovery (in MMbbl) 0 0 0  
Purchases of reserves in place (in MMbbl) 0 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (4) (5) (5)  
Economic revisions due to prices (in MMbbl) 1 (2) (4)  
Revisions of prior estimates (in MMbbl) 1 0 2  
Proved reserves, net, ending balance 54 57 64  
Net proved developed reserves (in MMbbl) 30 34 38 37
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 8,700 9,083 9,943  
Extensions and discoveries (in MMbbl) 280 205 115  
Improved recovery (in MMbbl) 75 56 33  
Purchases of reserves in place (in MMbbl) 0 288 52  
Sales of reserves in place (in MMbbl) (1) 0 0  
Production (in MMbbl) (298) (274) (309)  
Economic revisions due to prices (in MMbbl) 485 (792) (1,118)  
Revisions of prior estimates (in MMbbl) 98 134 368  
Proved reserves, net, ending balance 9,339 8,700 9,083  
Net proved developed reserves (in MMbbl) 6,787 6,369 6,960 7,751
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 8,632 8,941 9,785  
Extensions and discoveries (in MMbbl) 280 205 115  
Improved recovery (in MMbbl) 75 56 33  
Purchases of reserves in place (in MMbbl) 0 288 52  
Sales of reserves in place (in MMbbl) (1) 0 0  
Production (in MMbbl) (289) (265) (297)  
Economic revisions due to prices (in MMbbl) 484 (791) (1,115)  
Revisions of prior estimates (in MMbbl) 94 198 369  
Proved reserves, net, ending balance 9,276 8,632 8,941  
Net proved developed reserves (in MMbbl) 6,752 6,330 6,883 7,682