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Other Long-Term Assets - Schedule of other long-term assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]    
Prepaid cost of service toll $ 199 $ 157
Long-term inventory 137 126
Risk management 9 140
Long-term contracts, prepayments and other 269 177
Other assets 614 600
Less: current portion 61 35
Other long-term assets $ 553 $ 565