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SHARE CAPITAL - Outstanding Common Shares (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of number of shares outstanding [abstract]      
Balance – beginning of year $ 31,653 $ 26,267  
Issued upon exercise of stock options (in shares) 9,975,000 14,256,000  
Purchase of common shares under Normal Course Issuer Bid (In shares) (30,857,727)    
Purchase of common shares under Normal Course Issuer Bid $ 1,282    
Balance – end of year 31,974 $ 31,653 $ 26,267
Share capital      
Reconciliation of number of shares outstanding [abstract]      
Balance – beginning of year 9,109 4,671 4,541
Issued for the acquisition of AOSP and other assets (note 8) [1] 0 3,818 0
Issued upon exercise of stock options 332 466 559
Previously recognized liability on stock options exercised for common shares 120 154 117
Purchase of common shares under Normal Course Issuer Bid (238) 0 0
Balance – end of year $ 9,323 $ 9,109 $ 4,671
Ordinary shares | Share capital      
Reconciliation of number of shares outstanding [abstract]      
Balance - beginning of year (in shares) 1,222,769,000 1,110,952,000  
Balance – beginning of year $ 9,109 $ 4,671  
Issued for the acquisition of AOSP and other assets (note 7) (in shares) 0 97,561,000  
Issued for the acquisition of AOSP and other assets (note 8) $ 0 $ 3,818  
Issued upon exercise of stock options (in shares) 9,975,000 14,256,000  
Issued upon exercise of stock options $ 332 $ 466  
Previously recognized liability on stock options exercised for common shares $ 120 $ 154  
Purchase of common shares under Normal Course Issuer Bid (In shares) (30,858,000) 0  
Purchase of common shares under Normal Course Issuer Bid $ (238) $ 0  
Balance - end of year (in shares) 1,201,886,000 1,222,769,000 1,110,952,000
Balance – end of year $ 9,323 $ 9,109 $ 4,671
[1] During 2017, in connection with the acquisition of direct and indirect interests in the Athabasca Oil Sands Project ("AOSP") and other assets, the Company issued non-cash share consideration of $3,818 million. See note 8.