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Business Acquisition (Details) - CAD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Business Acquisition [Line Items]      
Investment in Kansas City Southern $ 41,626   $ 42,309
Equity earnings of Kansas City Southern 198 $ 0  
Dividend from Kansas City Southern 334 0  
Acquisition-related costs 0 3  
KCS      
Business Acquisition [Line Items]      
Investment in Kansas City Southern 41,626    
Equity earnings of Kansas City Southern 198    
Dividend from Kansas City Southern 334    
Equity Method Investment, Amortization Of Difference Between Carrying Amount and Underlying Equity 40    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity $ 30,000    
KCS      
Business Acquisition [Line Items]      
Business Acquisition, Name of Acquired Entity Kansas City Southern    
Acquisition-related costs $ 20 36  
Acquisition-related costs   3  
Payments of Financing Costs 33    
Purchased services and other | KCS      
Business Acquisition [Line Items]      
Acquisition-related costs 20 $ 33  
Income (Loss) from Equity Method Investments | KCS      
Business Acquisition [Line Items]      
Acquisition-related costs $ 13