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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Crude Oil, Synthetic Crude Oil, Bitumen, Natural Gas, Natural Gas Liquids        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 7,091 4,514 4,209  
Extensions and discoveries (in MMbbl) 912 45 61  
Improved recovery (in MMbbl) 64 27 22  
Purchases of reserves in place (in MMbbl) 16 2,336 18  
Sales of reserves in place (in MMbbl) 4 0 0  
Production (in MMbbl) 274 229 176  
Economic revisions due to prices (in MMbbl) 51 (54) (103)  
Revisions of prior estimates (in MMbbl) 165 344 277  
Proved reserves, net, ending balance 7,919 7,091 4,514  
Net proved developed reserves (in MMbbl) 6,571 5,825 3,307 2,990
Change in proved developed and undeveloped reserves, net (in MMbbl) 828 2,577 305  
North America | Synthetic Crude Oil        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 4,956 2,542 2,283  
Extensions and discoveries (in MMbbl) 744 0 0  
Improved recovery (in MMbbl) 0 0 0  
Purchases of reserves in place (in MMbbl) 0 2,232 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) 148 100 45  
Economic revisions due to prices (in MMbbl) 0 0 (108)  
Revisions of prior estimates (in MMbbl) 109 282 196  
Proved reserves, net, ending balance 5,661 4,956 2,542  
Net proved developed reserves (in MMbbl) 5,661 4,967 2,527 2,194
North America | Bitumen        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 1,365 1,301 1,263  
Extensions and discoveries (in MMbbl) 151 28 46  
Improved recovery (in MMbbl) 10 7 5  
Purchases of reserves in place (in MMbbl) 2 37 3  
Sales of reserves in place (in MMbbl) 4 0 0  
Production (in MMbbl) 64 70 71  
Economic revisions due to prices (in MMbbl) 45 (18) (23)  
Revisions of prior estimates (in MMbbl) 54 44 32  
Proved reserves, net, ending balance 1,469 1,365 1,301  
Net proved developed reserves (in MMbbl) 461 410 384 411
North America | Crude Oil and NGLs        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 594 504 471  
Extensions and discoveries (in MMbbl) 17 17 15  
Improved recovery (in MMbbl) 50 19 14  
Purchases of reserves in place (in MMbbl) 7 67 15  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) 47 44 43  
Economic revisions due to prices (in MMbbl) 18 (17) 19  
Revisions of prior estimates (in MMbbl) 1 14 51  
Proved reserves, net, ending balance 604 594 504  
Net proved developed reserves (in MMbbl) 378 399 353 341
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 6,915 4,347 4,017  
Extensions and discoveries (in MMbbl) 912 45 61  
Improved recovery (in MMbbl) 60 26 19  
Purchases of reserves in place (in MMbbl) 9 2,336 18  
Sales of reserves in place (in MMbbl) 4 0 0  
Production (in MMbbl) 259 214 159  
Economic revisions due to prices (in MMbbl) 63 (35) (112)  
Revisions of prior estimates (in MMbbl) 164 340 279  
Proved reserves, net, ending balance 7,734 6,915 4,347  
Net proved developed reserves (in MMbbl) 6,500 5,776 3,264 2,946
North Sea | Crude Oil and NGLs        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 107 93 119  
Extensions and discoveries (in MMbbl) 0 0 0  
Improved recovery (in MMbbl) 1 1 1  
Purchases of reserves in place (in MMbbl) 7 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) 9 9 9  
Economic revisions due to prices (in MMbbl) (11) (18) 10  
Revisions of prior estimates (in MMbbl) (3) 4 (8)  
Proved reserves, net, ending balance 114 107 93  
Net proved developed reserves (in MMbbl) 37 28 12 3
Offshore Africa | Crude Oil and NGLs        
Proved Developed And Undeveloped Reserves [Roll Forward]        
Proved reserves, net, beginning balance 69 74 73  
Extensions and discoveries (in MMbbl) 0 0 0  
Improved recovery (in MMbbl) 3 0 2  
Purchases of reserves in place (in MMbbl) 0 0 0  
Sales of reserves in place (in MMbbl) 0 0 0  
Production (in MMbbl) 6 6 8  
Economic revisions due to prices (in MMbbl) (1) (1) (1)  
Revisions of prior estimates (in MMbbl) 4 0 6  
Proved reserves, net, ending balance 71 69 74  
Net proved developed reserves (in MMbbl) 34 21 31 41