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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 9,943 8,544 7,919  
Extensions and discoveries (in MMbbl) 115 726 364  
Improved recovery (in MMbbl) 33 58 181  
Purchases of reserves in place (in MMbbl) 52 28 668  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (309) (320) (285)  
Economic revisions due to prices (in MMbbl) (1,118) 805 (285)  
Revisions of prior estimates (in MMbbl) 368 103 (19)  
Proved reserves, net, ending balance 9,083 9,943 8,544  
Net proved developed reserves (in MMbbl) 6,960 7,751 6,543 6,571
North America | Synthetic Crude Oil        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 6,847 5,554 5,661  
Extensions and discoveries (in MMbbl) 0 708 334  
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) (150) (151) (137)  
Economic revisions due to prices (in MMbbl) (927) 701 (288)  
Revisions of prior estimates (in MMbbl) 174 36 (17)  
Proved reserves, net, ending balance 5,944 6,847 5,554  
Net proved developed reserves (in MMbbl) 5,929 6,770 5,452 5,661
North America | Bitumen        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 2,413 2,216 1,469  
Extensions and discoveries (in MMbbl) 101 8 18  
Improved recovery (in MMbbl) 19 49 169  
Purchases of reserves in place (in MMbbl) 0 0 666  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (103) (109) (81)  
Economic revisions due to prices (in MMbbl) (296) 207 3  
Revisions of prior estimates (in MMbbl) 155 41 (27)  
Proved reserves, net, ending balance 2,289 2,413 2,216  
Net proved developed reserves (in MMbbl) 584 628 661 461
North America | Crude Oil and NGLs        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 525 598 604  
Extensions and discoveries (in MMbbl) 14 10 12  
Improved recovery (in MMbbl) 14 9 12  
Purchases of reserves in place (in MMbbl) 52 28 2  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (45) (45) (49)  
Economic revisions due to prices (in MMbbl) 108 (94) 0  
Revisions of prior estimates (in MMbbl) 40 20 17  
Proved reserves, net, ending balance 708 525 598  
Net proved developed reserves (in MMbbl) 370 285 354 378
North America | Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 9,785 8,368 7,734  
Extensions and discoveries (in MMbbl) 115 726 364  
Improved recovery (in MMbbl) 33 58 181  
Purchases of reserves in place (in MMbbl) 52 28 668  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (297) (305) (267)  
Economic revisions due to prices (in MMbbl) (1,115) 814 (285)  
Revisions of prior estimates (in MMbbl) 369 97 (28)  
Proved reserves, net, ending balance 8,941 9,785 8,368  
Net proved developed reserves (in MMbbl) 6,883 7,682 6,466 6,500
North Sea | Crude Oil and NGLs        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 87 105 114  
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) (6) (8) (10)  
Economic revisions due to prices (in MMbbl) 1 (12) (1)  
Revisions of prior estimates (in MMbbl) (3) 3 3  
Proved reserves, net, ending balance 79 87 105  
Net proved developed reserves (in MMbbl) 39 32 38 37
Offshore Africa | Crude Oil and NGLs        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 71 70 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) (5) (6) (7)  
Economic revisions due to prices (in MMbbl) (4) 3 1  
Revisions of prior estimates (in MMbbl) 2 4 6  
Proved reserves, net, ending balance 64 71 70  
Net proved developed reserves (in MMbbl) 38 37 39 34