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Other Assets - Schedule of Other Assets (Detail)
$ / shares in Units, $ in Millions
Dec. 02, 2020
CAD ($)
share
$ / shares
Dec. 31, 2021
CAD ($)
Dec. 23, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Disclosure of classes of share capital [Line Items]        
Intangible Assets   $ 78   $ 89
Private Equity Investments (Note 35)   53   52
Other Equity Investments   77   12
Net Investment in Finance Leases   60   52
Long-Term Receivables and Prepaids   77   11
Precious Metals   85   0
Other   1   0
Other assets   431   $ 216
Marten Hills | Marten Hills, Alberta        
Disclosure of classes of share capital [Line Items]        
Consideration received for sale of operating assets, purchase warrants $ 8      
Marten Hills | Marten Hills, Alberta | Share Purchase Warrants        
Disclosure of classes of share capital [Line Items]        
Expected life | share 3      
Exercise price, share purchase warrants (CAD per share) | $ / shares $ 2.00      
Headwater        
Disclosure of classes of share capital [Line Items]        
Other Equity Investments   $ 77    
Consideration Transferred in Sale of Non-current Assets, Warrants, Amount     $ 30