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Business acquisition - Schedule of Allocation of Net Assets and Consideration Paid (Details) - CAD ($)
$ in Millions
12 Months Ended
Apr. 13, 2024
Apr. 14, 2023
Apr. 13, 2023
Apr. 13, 2024
Sep. 30, 2024
Dec. 31, 2023
Business Acquisition [Line Items]            
Goodwill         $ 18,160 $ 17,729
KCS            
Business Acquisition [Line Items]            
Cash and cash equivalents $ 298 $ 298   $ 298    
Net working capital (110) 51   (110)    
Properties 28,749 28,748   28,749    
Intangible assets 3,022 3,022   3,022    
Other long-term assets 490 496   490    
Debt including debt maturing within one year (4,545) (4,545)   (4,545)    
Deferred income taxes (6,922) (6,984)   (6,922)    
Other long-term liabilities (443) (406)   (443)    
Total identifiable net assets 20,539 20,680   20,539    
Goodwill 17,632 17,491   17,632    
Total identifiable net assets and goodwill 38,171 38,171   38,171    
Fair value of previously held equity method investment 37,227 37,227 $ 37,227      
Intercompany payable balance, net acquired 12 12   12    
Fair value of non-controlling interest 932 932   932    
Total $ 38,171 $ 38,171        
Measurement period adjustments            
Cash and cash equivalents       0    
Net working capital       (161)    
Properties       1    
Intangible assets       0    
Other long-term assets       (6)    
Debt including debt maturing within one year       0    
Deferred income taxes       62    
Other long-term liabilities       (37)    
Total identifiable net assets       (141)    
Goodwill       141    
Total net identifiable net assets and goodwill       0    
Fair value of previously held equity method investment       0    
Intercompany payable balance, net acquired       0    
Fair value of non-controlling interest       0    
Total       $ 0