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Joint Arrangements - Husky - CNOOC Madura Ltd (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Results of Operations        
Revenue $ 66,897 $ 46,357 [1] $ 13,543 [1]  
Operating 5,569 4,716 [1] 1,955 [1]  
Net Earnings (Loss) 6,450 587 [1] (2,379) [1]  
Balance Sheets        
Total Current Assets 12,430 11,988    
Current Liabilities 8,021 7,305    
Cash and Cash Equivalents 4,524 2,873 $ 378 $ 186
Husky-CNOOC Madura Ltd.        
Results of Operations        
Revenue 383 439    
Operating 350 395    
Net Earnings (Loss) 33 44    
Balance Sheets        
Total Current Assets 247 167    
Non-Current Assets 1,926 1,433    
Current Liabilities 160 62    
Non-Current Liabilities 1,293 896    
Net Assets 720 642    
Cash and Cash Equivalents $ 64 $ 46    
[1] See Note 3X for revisions to prior period results.