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Joint Arrangements and Associate - Husky Midstream Limited Partnership (Details) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of joint ventures [line items]              
Net Earnings (Loss) $ 551 $ (194) $ 995 $ (2,226) $ (2,379) $ 2,194 $ (2,916)
Husky Midstream Limited Partnership              
Disclosure of joint ventures [line items]              
Share of equity investment     35.00%        
Net Earnings (Loss)     $ 74        
Unrecognised share of pre-tax net losses of joint ventures     21        
Investment in Equity-Accounted Affiliate $ 0   0        
Unrecognised share of losses of joint ventures     12        
Dividends received     37        
Share income (loss) from continuing operations of associates and joint ventures accounted for using equity method     $ 5        
Husky Midstream Limited Partnership | Power Assets Holding Ltd.              
Disclosure of joint ventures [line items]              
Share of equity investment     49.00%        
Husky Midstream Limited Partnership | Cheung Kong Infrastructure Holdings Ltd.              
Disclosure of joint ventures [line items]              
Share of equity investment     16.00%