v3.26.1
Gain on sale of equity investment (Details)
$ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2025
USD ($)
Jun. 30, 2026
CAD ($)
Jun. 30, 2025
CAD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
CAD ($)
Jun. 30, 2025
CAD ($)
Schedule of Equity Method Investments [Line Items]            
Proceeds from sale of equity investment   $ 0 $ 493   $ 0 $ 493
Gain on sale of equity investment   $ 0 333   $ 0 333
Panama Canal Railway Company            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage sold 50.00%          
Equity method investments, Gross sale amount $ 350          
Proceeds from sale of equity investment     493 $ 344    
Gain on sale of equity investment     333 232   $ 333
Gain on sale of equity investment, after tax     $ 282 $ 196