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Joint Arrangements and Associate - Husky - CNOOC Madura Ltd (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Results of Operations        
Revenue $ 46,357 $ 13,543 [1] $ 20,542 [1]  
Operating 4,716 1,955 [1] 2,088 [1]  
Net Earnings (Loss) 587 (2,379) [1] 2,194 [1]  
Balance Sheets        
Total Current Assets 11,988 2,976    
Current Liabilities 7,305 2,359    
Cash and Cash Equivalents 2,873 $ 378 $ 186 $ 781
Husky-CNOOC Madura Ltd.        
Results of Operations        
Revenue 439      
Operating 395      
Net Earnings (Loss) 44      
Balance Sheets        
Total Current Assets 167      
Non-Current Assets 1,433      
Current Liabilities 62      
Non-Current Liabilities 896      
Net Assets 642      
Cash and Cash Equivalents 46      
Investments in joint ventures accounted for using equity method $ 311      
Proportion of ownership interest in joint venture 40.00%      
Share of income from equity-accounted affiliate $ 47      
Distributions received $ 100      
[1] See Note 3(w) for revisions to comparative results.