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Acquisitions - Narrative (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 01, 2021
CAD ($)
share
$ / shares
shares
Dec. 31, 2021
CAD ($)
Sep. 08, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
$ / shares
Dec. 31, 2019
CAD ($)
Disclosure of detailed information about business combination [line items]          
Fair value of acquired receivables $ 1,100        
Gross contractual amounts receivable for acquired receivables 1,200        
Best estimate at acquisition date of contractual cash flows not expected to be collected for acquired receivables $ 45        
Goodwill   $ 3,473   $ 2,272 $ 2,272
Revenue of acquiree since acquisition date   21,200      
Profit (loss) of acquiree since acquisition date   2,000      
Lloydminister thermal          
Disclosure of detailed information about business combination [line items]          
Goodwill   651   0  
Sunrise          
Disclosure of detailed information about business combination [line items]          
Goodwill   550   0  
Oil Sands          
Disclosure of detailed information about business combination [line items]          
Goodwill   $ 3,473   $ 2,272  
Terra Nova          
Disclosure of detailed information about business combination [line items]          
Percentage of working interest acquired     21.00%    
Working interest, percentage   34.00%      
Consideration paid for working interest in asset acquisition     $ 3    
Cash acquired in asset acquisition     78    
Property, plant and equipment acquired in asset acquisition     84    
Decommissioning liabilities assumed in asset acquisition     $ 159    
Husky Energy, Inc.          
Disclosure of detailed information about business combination [line items]          
Warrant holder entitled to common share, term 5 years        
Warrant, exercise price | $ / shares $ 6.54        
Fair value of warrants $ 216        
Non-Controlling Interest 1.00%        
Acquisition, purchase price adjustment, increase (decrease) in accounts receivable and accrued revenues   $ 24      
Acquisition, purchase price adjustment, increase (decrease) in E&E assets   45      
Acquisition, purchase price adjustment, increase (decrease) in PP&E   (365)      
Acquisition, purchase price adjustment, increase (decrease) in other assets   32      
Acquisition, purchase price adjustment, increase (decrease) in accounts payable and accrued liabilities   (18)      
Acquisition, purchase price adjustment, increase (decrease) in decommissioning liabilities   (137)      
Acquisition, purchase price adjustment, increase (decrease) in other liabilities   (37)      
Acquisition, purchase price adjustment, increase (decrease) in long-term income tax receivable   (136)      
Acquisition, purchase price adjustment, increase (decrease) in equity-accounted affiliates   (94)      
Acquisition, purchase price adjustment, increase (decrease) in income tax payable   (6)      
Acquisition, purchase price adjustment, increase (decrease) in goodwill   577      
Acquisition, purchase price adjustment, increase (decrease) in deferred income tax asset, net   120      
Acquisition, purchase price adjustment, increase (decrease) in net assets   $ (560)      
Husky Energy, Inc. | Oil Sands          
Disclosure of detailed information about business combination [line items]          
Goodwill $ 1,300        
Husky Energy, Inc. | Oil Sands | Lloydminister thermal          
Disclosure of detailed information about business combination [line items]          
Goodwill 651        
Husky Energy, Inc. | Oil Sands | Sunrise          
Disclosure of detailed information about business combination [line items]          
Goodwill 550        
Husky Energy, Inc. | Oil Sands | Tucker          
Disclosure of detailed information about business combination [line items]          
Goodwill $ 88        
Husky Energy, Inc. | Common Shares          
Disclosure of detailed information about business combination [line items]          
Consideration transferred, equity interests issued per acquiree share | shares 0.7845        
Number of instruments or interests issued or issuable | share 788,500,000        
Equity interests of acquirer $ 6,111        
Share Price | $ / shares       $ 7.75  
Noncontrolling interest of acquired entity $ 11        
Husky Energy, Inc. | Share Purchase Warrants          
Disclosure of detailed information about business combination [line items]          
Consideration transferred, equity interests issued per acquiree share | shares 0.0651        
Number of instruments or interests issued or issuable | share 65,400,000        
Equity interests of acquirer $ 216        
Husky Energy, Inc. | Preferred Shares          
Disclosure of detailed information about business combination [line items]          
Number of instruments or interests issued or issuable | share 36,000,000        
Equity interests of acquirer $ 519        
Husky Energy, Inc. | Replacement Stock Options          
Disclosure of detailed information about business combination [line items]          
Consideration transferred, equity interests issued per acquiree share | shares 0.7845        
Equity interests of acquirer $ 9