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Business Acquisition (Details)
$ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 15, 2021
CAD ($)
Sep. 15, 2021
USD ($)
Sep. 30, 2022
CAD ($)
Sep. 30, 2021
CAD ($)
Sep. 30, 2022
CAD ($)
Sep. 30, 2021
CAD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Business Acquisition [Line Items]                
Investment in Kansas City Southern     $ 45,964   $ 45,964     $ 42,309
Equity earnings of Kansas City Southern     221 $ 0 627 $ 0    
Dividend from Kansas City Southern     259 0 593 0    
Acquisition-related costs     0 83 0 295    
Acquisition-related costs     0 0 0 45    
Merger termination fee     0 0 0 845 $ 700  
Payment to Kansas City Southern     0 1,773 0 1,773    
KCS                
Business Acquisition [Line Items]                
Investment in Kansas City Southern     45,964   45,964      
Equity Investment, Foreign Currency Translation         3,445      
Dividend from Kansas City Southern         593      
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity     30,000   30,000      
Equity Method Investment, Amortization Of Difference Between Carrying Amount and Underlying Equity     42   $ 121      
KCS                
Business Acquisition [Line Items]                
Business Acquisition, Name of Acquired Entity         Kansas City Southern      
Acquisition-related costs     18 98 $ 57 442    
Acquisition-related costs       0   45    
Merger termination fee           845 $ 700  
Payment to Kansas City Southern $ 1,773 $ 1,400            
Purchased services and other | KCS                
Business Acquisition [Line Items]                
Acquisition-related costs     18 15 57 147    
Income (Loss) from Equity Method Investments | KCS                
Business Acquisition [Line Items]                
Acquisition-related costs     $ 12   $ 39      
Other expense (income) | KCS                
Business Acquisition [Line Items]                
Acquisition-related costs       $ 83   $ 295