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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Synthetic Crude Oil | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 5,944 6,847 5,554  
Extensions and discoveries (in MMbbl) 0 0 708  
Improved recovery (in MMbbl) 29 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) (128) (150) (151)  
Economic revisions due to prices (in MMbbl) (455) (927) 701  
Revisions of prior estimates (in MMbbl) 0 174 36  
Proved reserves, net, ending balance 5,390 5,944 6,847  
Net proved developed reserves (in MMbbl) 5,389 5,929 6,770 5,452
Bitumen | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 2,289 2,413 2,216  
Extensions and discoveries (in MMbbl) 195 101 8  
Improved recovery (in MMbbl) 5 19 49  
Purchases of reserves in place (in MMbbl) 267 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (91) (103) (109)  
Economic revisions due to prices (in MMbbl) (263) (296) 207  
Revisions of prior estimates (in MMbbl) 144 155 41  
Proved reserves, net, ending balance 2,546 2,289 2,413  
Net proved developed reserves (in MMbbl) 582 584 628 661
Crude Oil and NGLs       | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 708 525 598  
Extensions and discoveries (in MMbbl) 11 14 10  
Improved recovery (in MMbbl) 21 14 9  
Purchases of reserves in place (in MMbbl) 21 52 28  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (45) (45) (45)  
Economic revisions due to prices (in MMbbl) (73) 108 (94)  
Revisions of prior estimates (in MMbbl) 54 40 20  
Proved reserves, net, ending balance 696 708 525  
Net proved developed reserves (in MMbbl) 359 370 285 354
Crude Oil and NGLs       | North Sea        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 79 87 105  
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) (6) (8)  
Economic revisions due to prices (in MMbbl) 1 1 (12)  
Revisions of prior estimates (in MMbbl) (64) (3) 3  
Proved reserves, net, ending balance 11 79 87  
Net proved developed reserves (in MMbbl) 5 39 32 38
Crude Oil and NGLs       | Offshore Africa        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 64 71 70  
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) (2) (4) 3  
Revisions of prior estimates (in MMbbl) 0 2 4  
Proved reserves, net, ending balance 57 64 71  
Net proved developed reserves (in MMbbl) 34 38 37 39
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 9,083 9,943 8,544  
Extensions and discoveries (in MMbbl) 205 115 726  
Improved recovery (in MMbbl) 56 33 58  
Purchases of reserves in place (in MMbbl) 288 52 28  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (274) (309) (320)  
Economic revisions due to prices (in MMbbl) (792) (1,118) 805  
Revisions of prior estimates (in MMbbl) 134 368 103  
Proved reserves, net, ending balance 8,700 9,083 9,943  
Net proved developed reserves (in MMbbl) 6,369 6,960 7,751 6,543
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 8,941 9,785 8,368  
Extensions and discoveries (in MMbbl) 205 115 726  
Improved recovery (in MMbbl) 56 33 58  
Purchases of reserves in place (in MMbbl) 288 52 28  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (265) (297) (305)  
Economic revisions due to prices (in MMbbl) (791) (1,115) 814  
Revisions of prior estimates (in MMbbl) 198 369 97  
Proved reserves, net, ending balance 8,632 8,941 9,785  
Net proved developed reserves (in MMbbl) 6,330 6,883 7,682 6,466