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Net interest expense (Tables)
 12 Months Ended
Dec. 31, 2021
Interest Income (Expense), Net [Abstract]  
Net Interest Expense
(in millions of Canadian dollars)202120202019
Interest cost$459 $478 $471 
Interest capitalized to Properties(13)(16)(17)
Interest expense446 462 454 
Interest income(6)(4)(6)
Net interest expense$440 $458 $448