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Investment in KCS - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Apr. 13, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]            
Investment in Kansas City Southern $ 0 $ 44,402   $ 0   $ 45,091
Equity earnings of Kansas City Southern $ 0   $ 221 $ 230 $ 627  
KCS            
Schedule of Equity Method Investments [Line Items]            
Equity earnings of Kansas City Southern   230        
Dividends received   300        
Foreign currency translation   578     3,445  
Amortization of basis difference   $ 48     $ 121