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Investments
 12 Months Ended
Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]  
Investments Investments
(in millions of Canadian dollars)20202019
Investment in CMQ U.S. accounted for on an equity basis (Note 10)$— $127 
Other rail investments accounted for on an equity basis150 166 
Other investments49 48 
Total investments$199 $341