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Other Assets - Schedule of Other Assets (Detail) - CAD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Disclosure of classes of share capital [Line Items]    
Intangible Assets $ 81 $ 89
Private Equity Investments (Note 26) 53 52
Net Investment in Finance Leases 61 52
Long-Term Receivables and Prepaids 139 11
Precious Metals 89 0
Other 40 12
Other assets 463 $ 216
Receivables and payables related to insurance contracts 98  
Warrants    
Disclosure of classes of share capital [Line Items]    
Other $ 39