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SHARE CAPITAL - Outstanding Common Shares (Details) - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of number of shares outstanding [abstract]      
Balance – beginning of year $ 26,267 $ 27,381  
Issued upon exercise of stock options (in shares) 14,256 16,284  
Balance – end of year $ 31,653 $ 26,267 $ 27,381
Share capital      
Reconciliation of number of shares outstanding [abstract]      
Balance – beginning of year 4,671 4,541 4,432
Issued for the acquisition of AOSP and other assets (note 7) [1] 3,818 0 0
Issued upon exercise of stock options 466 559 91
Previously recognized liability on stock options exercised for common shares 154 117 18
Return of capital on PrairieSky Royalty Ltd. share distribution 0 (546) 0
Balance – end of year $ 9,109 $ 4,671 $ 4,541
Ordinary shares | Share capital      
Reconciliation of number of shares outstanding [abstract]      
Balance - beginning of year (in shares) 1,110,952 1,094,668  
Balance – beginning of year $ 4,671 $ 4,541  
Issued for the acquisition of AOSP and other assets (note 7) (in shares) 97,561 0  
Issued for the acquisition of AOSP and other assets (note 7) $ 3,818 $ 0  
Issued upon exercise of stock options (in shares) 14,256 16,284  
Issued upon exercise of stock options $ 466 $ 559  
Previously recognized liability on stock options exercised for common shares 154 117  
Return of capital on PrairieSky Royalty Ltd. share distribution $ 0 $ (546)  
Balance - end of year (in shares) 1,222,769 1,110,952 1,094,668
Balance – end of year $ 9,109 $ 4,671 $ 4,541
[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 7.