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Income taxes - Deferred Income Tax Assets and Liabilities (Details)
$ in Millions, $ in Billions
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 14, 2021
CAD ($)
Dec. 14, 2021
USD ($)
Deferred income tax assets        
Tax losses and other attributes carried forward $ 70 $ 19    
Liabilities carrying value in excess of tax basis 108 124    
Unrealized foreign exchange losses 50 0    
Environmental remediation costs 22 22    
Other 5 5    
Total deferred income tax assets 255 170    
Valuation Allowance (4) 0    
Total net deferred income tax assets 251 170    
Deferred income tax liabilities        
Investment in Kansas City Southern 7,526 7,079 $ 7,200 $ 5.6
Properties carrying value in excess of tax basis 4,149 3,887    
Pensions carrying value in excess of tax basis 691 441    
Unrealized foreign exchange gains 0 13    
Other 82 102    
Total deferred income tax liabilities 12,448 11,522    
Total net deferred income tax liabilities $ 12,197 $ 11,352