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Other Assets - Schedule of Other Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Jun. 08, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 23, 2021
Disclosure of classes of share capital [Line Items]        
Intangible Assets (1)   $ 19 $ 78  
Private Equity Investments (Note 37)   55 53  
Other Equity Investments   0 77  
Net Investment in Finance Leases   62 60  
Long-Term Receivables and Prepaids   120 77  
Precious Metals   86 85  
Other   0 1  
Other assets   342 431  
Oil Sands        
Disclosure of classes of share capital [Line Items]        
Disposals, intangible assets other than goodwill   $ 49    
Headwater Exploration Inc.        
Disclosure of classes of share capital [Line Items]        
Proceeds from disposal of oil and gas assets $ 110      
Headwater Exploration Inc.        
Disclosure of classes of share capital [Line Items]        
Other Equity Investments     $ 77  
Consideration transferred in sale of non-current assets, warrants, amount       $ 30