v3.26.1
Revenues (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 4,137 $ 3,673 $ 7,810 $ 7,441
Leasing revenues 27 26 55 53
Total revenues 4,164 3,699 7,865 7,494
Freight        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,088 3,629 7,716 7,356
Total revenues 4,088 3,629 7,716 7,356
Grain        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 925 743 1,796 1,531
Coal        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 209 256 435 513
Potash        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 184 167 333 323
Fertilizers and sulphur        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 110 98 222 212
Forest products        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 198 195 379 412
Energy, chemicals and plastics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 777 712 1,477 1,470
Metals, minerals and consumer products        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 524 444 962 892
Automotive        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 403 330 699 645
Intermodal        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 758 684 1,413 1,358
Non-freight excluding leasing revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 49 $ 44 $ 94 $ 85