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Other Expense (Income) (Tables)
12 Months Ended
Dec. 31, 2020
Other Income and Expenses [Abstract]  
Other (income) expense
(in millions of Canadian dollars)202020192018
Foreign exchange (gain) loss on debt and lease liabilities$(14)$(94)$168 
Other foreign exchange (gains) losses(1)(4)
Other8 
Other (income) expense$(7)$(89)$174