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Financing costs
 3 Months Ended
Mar. 31, 2024
Financing costs and additional notes and loans payable information [Abstract]  
Financing costs Financing costs
      Three Months
      to March 31
millions of Canadian dollars2024 2023 
Debt-related interest
52 46 
Capitalized interest
(41)(30)
Net interest expense
11 16 
Other interest
1 — 
Total financing
12 16