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Other Long-Term Assets - Summary of Assets, Liabilities, Partners' Equity and Equity (Income) Loss (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of joint ventures [line items]      
Current assets $ 5,942 $ 4,361  
Current liabilities 7,422 5,078  
Partners' equity 36,945 32,380 $ 34,991
Revenue 32,854 17,491 24,394
Net loss (7,664) 435 (5,416)
Depletion, depreciation and amortization 5,724 6,046 5,546
Interest and other financing expense 711 756 $ 836
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Partners' equity (562) (153)  
Revenue 294 $ 174  
Partnership distributions $ 400    
Percent of pro rata share of debt company has committed paying to joint venture, toll payer percent 25.00% 25.00%  
Company's voting percent interest in joint venture 50.00%    
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Current assets $ 280 $ 230  
Non-current assets 10,806 11,098  
Current liabilities 798 3,146  
Non-current liabilities 11,412 8,488  
Partners' equity (1,124) (306)  
Revenue 1,168 1,348  
Net loss 18 188  
Partnership distributions 800    
Depletion, depreciation and amortization 278 214  
Interest and other financing expense $ 412 $ 420