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ACQUISITION OF ADDITIONAL OWNERSHIP INTEREST IN THE SYNCRUDE PROJECT (Details) - Syncrude
$ in Millions, $ in Millions
 12 Months Ended
Feb. 23, 2018
USD ($)
Dec. 31, 2019
CAD ($)
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