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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, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure Of Detailed Information About Cash Flows [Line Items]          
Accounts receivable $ 1,233 $ (977) $ (142)    
Current income tax assets (liabilities) 471 527 (165)    
Inventory (74) 81 (79)    
Prepaids and other (3) (28) 14    
Accounts payable (7) 175 31    
Accrued liabilities (268) 365 (116)    
Other long-term liabilities (351) 469 0    
Net changes in non-cash working capital 1,001 612 (457)    
Net change in non-cash working capital 1,346 299 (542)    
Net change in non-cash working capital, investing activities (345) 313 85    
Exploration and evaluation assets          
Expenditures on exploration and evaluation assets 282 159 29    
Net proceeds on sale of exploration and evaluation assets (16) (35) (35)    
Net expenditures (proceeds) on exploration and evaluation assets 266 124 (6)    
Property, plant and equipment          
Expenditures on property, plant and equipment 4,175 4,574 4,152    
Net proceeds on sale of property, plant and equipment 0 0 (349)    
Net expenditures on property, plant and equipment [1] 4,175 $ 4,574 3,803    
Deferred purchase consideration payable 118       $ 469
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 $ 118     $ 375 $ 469
[1] 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