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SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Proved and Proved Developed Oil and Natural Gas Reserves, Net of Royalties (Details) - MMBbls
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 7,919 7,091 4,514  
Extensions and discoveries (in MMbbl) 364 912 45  
Improved recovery (in MMbbl) 181 64 27  
Purchases of reserves in place (in MMbbl) 668 16 2,336  
Sales of reserves in place (in MMbbl) 0 (4) 0  
Production (in MMbbl) (285) (274) (229)  
Economic revisions due to prices (in MMbbl) (285) (51) 54  
Revisions of prior estimates (in MMbbl) (19) 165 344  
Proved reserves, net, ending balance 8,544 7,919 7,091  
Net proved developed reserves (in MMbbl) 6,543 6,571 5,825 3,307
Change in proved developed and undeveloped reserves, net (in MMbbl) 625 828 2,577  
North America | Synthetic Crude Oil        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 5,661 4,956 2,542  
Extensions and discoveries (in MMbbl) 334 744 0  
Improved recovery (in MMbbl) 0 0 0  
Purchases of reserves in place (in MMbbl) 0 0 2,232  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (137) (148) (100)  
Economic revisions due to prices (in MMbbl) (288) 0 0  
Revisions of prior estimates (in MMbbl) (17) 109 282  
Proved reserves, net, ending balance 5,554 5,661 4,956  
Net proved developed reserves (in MMbbl) 5,452 5,661 4,967 2,527
North America | Bitumen        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 1,469 1,365 1,301  
Extensions and discoveries (in MMbbl) 18 151 28  
Improved recovery (in MMbbl) 169 10 7  
Purchases of reserves in place (in MMbbl) 666 2 37  
Sales of reserves in place (in MMbbl) 0 (4) 0  
Production (in MMbbl) (81) (64) (70)  
Economic revisions due to prices (in MMbbl) 3 (45) 18  
Revisions of prior estimates (in MMbbl) (27) 54 44  
Proved reserves, net, ending balance 2,216 1,469 1,365  
Net proved developed reserves (in MMbbl) 661 461 410 384
North America | Crude Oil and NGLs        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 604 594 504  
Extensions and discoveries (in MMbbl) 12 17 17  
Improved recovery (in MMbbl) 12 50 19  
Purchases of reserves in place (in MMbbl) 2 7 67  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (49) (47) (44)  
Economic revisions due to prices (in MMbbl) 0 (18) 17  
Revisions of prior estimates (in MMbbl) 17 1 14  
Proved reserves, net, ending balance 598 604 594  
Net proved developed reserves (in MMbbl) 354 378 399 353
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 7,734 6,915 4,347  
Extensions and discoveries (in MMbbl) 364 912 45  
Improved recovery (in MMbbl) 181 60 26  
Purchases of reserves in place (in MMbbl) 668 9 2,336  
Sales of reserves in place (in MMbbl) 0 (4) 0  
Production (in MMbbl) (267) (259) (214)  
Economic revisions due to prices (in MMbbl) (285) (63) 35  
Revisions of prior estimates (in MMbbl) (28) 164 340  
Proved reserves, net, ending balance 8,368 7,734 6,915  
Net proved developed reserves (in MMbbl) 6,466 6,500 5,776 3,264
North Sea | Crude Oil and NGLs        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 114 107 93  
Extensions and discoveries (in MMbbl) 0 0 0  
Improved recovery (in MMbbl) 0 1 1  
Purchases of reserves in place (in MMbbl) 0 7 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (10) (9) (9)  
Economic revisions due to prices (in MMbbl) (1) 11 18  
Revisions of prior estimates (in MMbbl) 3 (3) 4  
Proved reserves, net, ending balance 105 114 107  
Net proved developed reserves (in MMbbl) 38 37 28 12
Offshore Africa | Crude Oil and NGLs        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 71 69 74  
Extensions and discoveries (in MMbbl) 0 0 0  
Improved recovery (in MMbbl) 0 3 0  
Purchases of reserves in place (in MMbbl) 0 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) (7) (6) (6)  
Economic revisions due to prices (in MMbbl) 1 1 1  
Revisions of prior estimates (in MMbbl) 6 4 0  
Proved reserves, net, ending balance 70 71 69  
Net proved developed reserves (in MMbbl) 39 34 21 31