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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of joint ventures [line items]      
Current assets $ 4,487 $ 3,020  
Current liabilities 6,637 4,762  
Partners’ equity 34,991 31,974 $ 31,653
Product sales 24,394 22,282 18,360 [1]
Net loss (5,416) (2,591) $ (2,397)
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Current assets 124 105  
Non-current assets 5,664 5,625  
Current liabilities 192 176  
Non-current liabilities 5,655 5,267  
Partners’ equity (59) 287  
Product sales 868 0  
Net loss 346 5  
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Current assets 248 210  
Non-current assets 11,328 11,250  
Current liabilities 384 352  
Non-current liabilities 11,310 10,534  
Partners’ equity (118) 574  
Product sales 1,736 0  
Net loss $ 692 $ 10  
[1] In connection with adoption of IFRS 15 on January 1, 2018, the Company has reclassified certain comparative amounts in a manner consistent with the presentation adopted for the year ended December 31, 2018.