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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, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure Of Detailed Information About Cash Flows [Line Items]          
Accounts receivable $ (1,310) $ 1,233 $ (977)    
Current income tax (liabilities) assets (164) 471 527    
Inventory (194) (74) 81    
Prepaids and other 2 (3) (28)    
Other long-term assets 117 0 0    
Accounts payable 39 (7) 175    
Accrued liabilities 265 (268) 365    
Other long-term liabilities (23) (351) 469    
Net changes in non-cash working capital (1,268) 1,001 612    
Net change in non-cash working capital, operating activities (1,033) 1,346 299    
Net change in non-cash working capital, investing activities (235) (345) 313    
Exploration and evaluation assets          
Expenditures on exploration and evaluation assets 73 282 159    
Net proceeds on sale of exploration and evaluation assets 0 (16) (35)    
Net expenditures on exploration and evaluation assets 73 266 $ 124    
Deferred purchase consideration payable $ 95 $ 118      
Installment period 4 years 4 years      
Deferred purchase consideration payable $ 95 $ 118      
AOSP          
Exploration and evaluation assets          
Deferred purchase consideration payable       $ 375 $ 469