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Long-term debt (Tables)
3 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
Long-term debt
As at
Mar 31
As at
Dec 31
millions of Canadian dollars2024 2023 
Long-term debt
3,447 3,447 
Finance leases
559 564 
Total long-term debt4,006 4,011