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Other Long-Term Assets - Summary of Assets, Liabilities, Partners' Equity and Equity (Income) Loss (Details) - CAD ($)
$ in Millions
 7 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of joint ventures [line items]        
Current assets $ 4,361 $ 4,361 $ 4,487  
Current liabilities 5,078 5,078 6,637  
Partners’ equity 32,380 32,380 34,991 $ 31,974
Product sales   17,491 24,394 22,282
Net loss   435 (5,416) (2,591)
Depletion, depreciation and amortization   6,046 5,546 5,161
Interest and other financing expense   756 836 $ 739
North West Redwater Partnership        
Disclosure of joint ventures [line items]        
Current assets 115 115 124  
Non-current assets 5,549 5,549 5,664  
Current liabilities 1,573 1,573 192  
Non-current liabilities 4,244 4,244 5,655  
Partners’ equity (153) (153) (59)  
Product sales   674 868  
Net loss   94 346  
Depletion, depreciation and amortization   107 76  
Interest and other financing expense   $ 210 199  
Refining toll payment made to joint venture $ 174      
Percent of pro rata share of debt company has committed paying to joint venture 25.00% 25.00%    
North West Redwater Partnership        
Disclosure of joint ventures [line items]        
Current assets $ 230 $ 230 248  
Non-current assets 11,098 11,098 11,328  
Current liabilities 3,146 3,146 384  
Non-current liabilities 8,488 8,488 11,310  
Partners’ equity $ (306) (306) (118)  
Product sales   1,348 1,736  
Net loss   188 692  
Depletion, depreciation and amortization   214 152  
Interest and other financing expense   $ 420 $ 398