v3.22.4
Assets Held For Sale (Details) - CAD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Long Lived Assets Held-for-sale [Line Items]        
Loss on assets held for sale   $ 0 $ (137) $ 486
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Assets held for sale     260  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Track and Roadway [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Impairment loss, pre-tax $ 486      
Loss on assets held for sale $ 363      
Non-Core Lines [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Loss recovery, pre-tax     137  
Loss recovery, after-tax     $ 102