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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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 5,840 5,390 5,944  
Extensions and discoveries (in MMbbl) 0 162 0  
Improved recovery (in MMbbl) 1 28 29  
Purchases of reserves in place (in MMbbl) 701 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (141) (141) (128)  
Economic revisions due to prices (in MMbbl) (106) 333 (455)  
Revisions of prior estimates (in MMbbl) 18 68 0  
Proved reserves, net, ending balance 6,313 5,840 5,390  
Net proved developed reserves (in MMbbl) 6,268 5,804 5,389 5,929
Bitumen | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 2,669 2,546 2,289  
Extensions and discoveries (in MMbbl) 62 67 195  
Improved recovery (in MMbbl) 7 9 5  
Purchases of reserves in place (in MMbbl) 1 0 267  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (101) (102) (91)  
Economic revisions due to prices (in MMbbl) (38) 123 (263)  
Revisions of prior estimates (in MMbbl) 77 26 144  
Proved reserves, net, ending balance 2,676 2,669 2,546  
Net proved developed reserves (in MMbbl) 629 610 582 584
Crude Oil and NGLs       | North America        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 767 696 708  
Extensions and discoveries (in MMbbl) 31 51 11  
Improved recovery (in MMbbl) 13 37 21  
Purchases of reserves in place (in MMbbl) 137 0 21  
Sales of reserves in place (in MMbbl) (2) (1) 0  
Production (in MMbbl) (49) (47) (45)  
Economic revisions due to prices (in MMbbl) (35) 29 (73)  
Revisions of prior estimates (in MMbbl) 42 1 54  
Proved reserves, net, ending balance 903 767 696  
Net proved developed reserves (in MMbbl) 359 337 359 370
Crude Oil and NGLs       | North Sea        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 9 11 79  
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) 0 0 1  
Revisions of prior estimates (in MMbbl) 1 3 (64)  
Proved reserves, net, ending balance 6 9 11  
Net proved developed reserves (in MMbbl) 6 6 5 39
Crude Oil and NGLs       | Offshore Africa        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 54 57 64  
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) (4) (5)  
Economic revisions due to prices (in MMbbl) 0 1 (2)  
Revisions of prior estimates (in MMbbl) (2) 1 0  
Proved reserves, net, ending balance 48 54 57  
Net proved developed reserves (in MMbbl) 25 30 34 38
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 9,339 8,700 9,083  
Extensions and discoveries (in MMbbl) 93 280 205  
Improved recovery (in MMbbl) 21 75 56  
Purchases of reserves in place (in MMbbl) 839 0 288  
Sales of reserves in place (in MMbbl) (2) (1) 0  
Production (in MMbbl) (299) (298) (274)  
Economic revisions due to prices (in MMbbl) (179) 485 (792)  
Revisions of prior estimates (in MMbbl) 136 98 134  
Proved reserves, net, ending balance 9,947 9,339 8,700  
Net proved developed reserves (in MMbbl) 7,288 6,787 6,369 6,960
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 9,276 8,632 8,941  
Extensions and discoveries (in MMbbl) 93 280 205  
Improved recovery (in MMbbl) 21 75 56  
Purchases of reserves in place (in MMbbl) 839 0 288  
Sales of reserves in place (in MMbbl) (2) (1) 0  
Production (in MMbbl) (291) (289) (265)  
Economic revisions due to prices (in MMbbl) (180) 484 (791)  
Revisions of prior estimates (in MMbbl) 136 94 198  
Proved reserves, net, ending balance 9,892 9,276 8,632  
Net proved developed reserves (in MMbbl) 7,256 6,752 6,330 6,883