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Revenues (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 3,634 $ 3,503 $ 11,075 $ 10,570
Leasing revenues 27 46 80 102
Total revenues 3,661 3,549 11,155 10,672
Freight        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 3,589 3,461 10,945 10,422
Total revenues 3,589 3,461 10,945 10,422
Grain        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 702 668 2,233 2,063
Coal        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 255 248 768 693
Potash        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 167 144 490 461
Fertilizers and sulphur        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 102 91 314 298
Forest products        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 193 198 605 603
Energy, chemicals and plastics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 701 712 2,171 2,109
Metals, minerals and consumer products        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 458 443 1,350 1,347
Automotive        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 343 333 988 956
Intermodal        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 668 624 2,026 1,892
Non-freight excluding leasing revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 45 $ 42 $ 130 $ 148