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Other Long-Term Assets - Schedule of other long-term assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Subclassifications of assets, liabilities and equities [abstract]    
Long-term prepayments, contracts and other $ 313 $ 279
Prepaid cost of service tolls 166 179
Long-term inventory 204 141
Risk management (note 19) 13 13
Other assets 696 612
Less: current portion 76 71
Other long-term assets $ 620 $ 541