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Joint Arrangements and Associate - Husky Midstream Limited Partnership (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
 [1]
Dec. 31, 2019
 [1]
Disclosure of joint ventures [line items]      
Net Earnings (Loss) $ 587 $ (2,379) $ 2,194
Husky Midstream Limited Partnership      
Disclosure of joint ventures [line items]      
Proportion of ownership interest in joint venture 35.00%    
Net Earnings (Loss) $ 134    
Unrecognised share of pre-tax net losses of joint ventures 18    
Investments in joint ventures accounted for using equity method 0    
Unrecognised share of losses of joint ventures 17    
Distributions received 37    
Joint venture, contributions $ 32    
Husky Midstream Limited Partnership | Power Assets Holding Ltd.      
Disclosure of joint ventures [line items]      
Proportion of ownership interest in joint venture 49.00%    
Husky Midstream Limited Partnership | Cheung Kong Infrastructure Holdings Ltd.      
Disclosure of joint ventures [line items]      
Proportion of ownership interest in joint venture 16.00%    
[1] See Note 3(w) for revisions to comparative results.