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Business acquisition (Details) - KCS
mi in Thousands, $ in Millions
3 Months Ended
Dec. 14, 2021
mi
Mar. 31, 2023
CAD ($)
Mar. 31, 2022
CAD ($)
Business Acquisition [Line Items]      
Percentage of voting interest acquired 100.00%    
Miles of transportation network | mi 7    
Acquisition-related costs   $ 15 $ 20
Purchased services and other      
Business Acquisition [Line Items]      
Acquisition-related costs   12 20
Income (loss) from equity method investments      
Business Acquisition [Line Items]      
Acquisition-related costs   10 $ 13
Other expense (income)      
Business Acquisition [Line Items]      
Acquisition-related costs   $ 3