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Other (Income) Expense
 9 Months Ended
Sep. 30, 2021
Other Income and Expenses [Abstract]  
Other Income and Expenses Other expense (income)
For the three months ended September 30For the nine months ended September 30
(in millions of Canadian dollars)2021202020212020
Foreign exchange loss (gain) on debt and lease liabilities$46 $(40)$(39)$89 
Other foreign exchange (gains) losses(7)2 (9)(2)
Acquisition-related costs (Note 10)
83 — 295 — 
Other2 2 6 2 
Other expense (income)$124 $(36)$253 $89