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Other Assets - Schedule of Other Assets (Detail) - CAD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Other Noncurrent Assets [Abstract]    
Long-Term Receivables and Prepaids $ 48 $ 120
Precious Metals 79 86
Net Investment in Finance Leases 62 62
Private Equity Investments (Note 22) 66 55
Intangible Assets 11 19
Other assets $ 266 $ 342