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Investment in KCS - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Apr. 13, 2023
Schedule of Equity Method Investments [Line Items]      
Investment in Kansas City Southern     $ 44,402
Equity earnings of Kansas City Southern $ 0 $ 204  
KCS      
Schedule of Equity Method Investments [Line Items]      
Dividends received   300  
Amortization of basis difference   $ 42