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Income taxes (Details)
$ in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
CAD ($)
Sep. 30, 2024
CAD ($)
Sep. 30, 2025
CAD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
CAD ($)
Income Tax Disclosure [Abstract]          
Effective tax rate 24.34% 23.88% 23.58% 23.58% 24.44%
Effective tax rate, excluding discrete items 24.50% 24.24% 24.50% 24.50% 24.75%
Deferred income tax recovery         $ 3
Business Combination [Line Items]          
Settlement of Mexican tax audits $ 0 $ 2 $ 12   2
Schedule of Equity Method Investments [Line Items]          
Gain on sale of equity investment 0 0 333   0
Mexican Tax Authority          
Business Combination [Line Items]          
Other tax expense (recovery)   (7)     3
Settlement of Mexican tax audits     11    
Panama Canal Railway Company          
Schedule of Equity Method Investments [Line Items]          
Gain on sale of equity investment     333 $ 232  
KCS          
Business Combination [Line Items]          
Amortization of fair value adjustments 97 90 287   264
Acquisition-related costs $ 13 $ 36 $ 52   $ 90