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Acquisitions - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jan. 01, 2021
CAD ($)
share
$ / shares
shares
Sep. 30, 2021
CAD ($)
Sep. 30, 2021
CAD ($)
Sep. 08, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
$ / shares
Disclosure of detailed information about business combination [line items]          
Revenue of acquiree since acquisition date   $ 6,700 $ 15,900    
Profit (loss) of acquiree since acquisition date   $ 656 $ 1,700    
Terra Nova          
Disclosure of detailed information about business combination [line items]          
Percentage of working interest acquired       21.00%  
Working interest, percentage   34.00% 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        
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         $ 36
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
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. | Cenovus Replacement Stock Options          
Disclosure of detailed information about business combination [line items]          
Equity interests of acquirer $ 9        
Number of share options per replacement stock option (in shares) | shares 0.7845