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Acquisition Of Additional Ownership Interest In Syncrude (Details) - Syncrude
$ in Millions, $ in Millions
 12 Months Ended
Feb. 23, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Feb. 23, 2018
CAD ($)
Disclosure of detailed information about business combination [line items]      
Percentage of additional working interest acquired 5.00%    
Cash transferred $ 923    
Interest purchased (as a percent) 58.74%   58.74%
Assets acquired      
Accounts receivable     $ 2
Inventory     15
Property, plant and equipment     998
Exploration and evaluation     163
Total assets acquired     1,178
Liabilities assumed      
Accounts payable and other liabilities     (51)
Employee future benefits     (33)
Decommissioning provision     (169)
Deferred income taxes     (2)
Total liabilities assumed     (255)
Net assets acquired     $ 923
Contribution to gross revenues   $ 270  
Contribution to consolidated net income   7  
Proforma revenue contributed by acquired entity if acquisition had occurred at the beginning of year   64  
Proforma net loss contributed by acquired entity if acquisition had occurred at the beginning of year   (4)  
Proforma gross revenues   39,660  
Proforma net income   $ 3,300