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SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION - Supplemental Schedule Of Cash Flow Information (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2015
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure Of Detailed Information About Cash Flows [Line Items]          
Accounts receivable $ (977) $ (142) $ 615    
Current income tax assets 527 (165) (447)    
Inventory 81 (79) 142    
Prepaids and other (28) 14 11    
Accounts payable 175 31 7    
Accrued liabilities 365 (116) (981)    
Other long-term liabilities 469 0 0    
Net changes in non-cash working capital 612 (457) (653)    
Net change in non-cash working capital 299 (542) 239    
Net change in non-cash working capital 0 0 (40)    
Net change in non-cash working capital, investing activities 313 85 (852)    
Exploration and evaluation assets          
Expenditures on exploration and evaluation assets 159 29 180    
Net proceeds on sale of exploration and evaluation assets (35) (35) (416)    
Net expenditures (proceeds) on exploration and evaluation assets [1] 124 (6) (236)    
Property, plant and equipment          
Expenditures on property, plant and equipment 4,574 4,152 5,118    
Net proceeds on sale of property, plant and equipment 0 (349) (414)    
Net expenditures on property, plant and equipment [1],[2] $ 4,574 3,803 4,704    
Investment in PrairieSky Royalty Ltd.          
Property, plant and equipment          
Non-cash share consideration received     $ 985    
Disposal of Cold Lake Pipeline | Investment in Inter Pipeline Ltd.          
Property, plant and equipment          
Non-cash share consideration received   $ 190      
AOSP          
Property, plant and equipment          
Deferred purchase consideration payable       $ 375 $ 469
[1] Net proceeds on exploration and evaluation assets and net expenditures on property, plant and equipment in 2015 exclude non-cash share consideration of $985 million received from PrairieSky Royalty Ltd. ("PrairieSky") on the disposition of royalty income assets.
[2] Net expenditures on property, plant and equipment in 2016 exclude non-cash share consideration of $190 million received from Inter Pipeline Ltd. ("Inter Pipeline") on the disposition of the Company's interest in the Cold Lake Pipeline.