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Other Assets - Schedule of Other Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Other Noncurrent Assets [Abstract]    
Private Equity Investments (Note 32) $ 219 $ 131
Precious Metals 92 76
Long-Term Receivables and Prepaids 68 50
Net Investment in Finance Leases 61 61
Intangible Assets 11 0
Other assets $ 451 $ 318