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Business Combinations (Narrative) (Details) - CAD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 02, 2019
Aug. 27, 2019
Mar. 20, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]              
Additional cash consideration         $ 0 $ 25 $ 0
H&R Transport Limited [Member]              
Business Acquisition [Line Items]              
Fair value of total consideration transferred $ 105            
Cash paid at closing 95            
Subsequent consideration and other $ 10       $ 2    
TransX [Member]              
Business Acquisition [Line Items]              
Fair value of total consideration transferred     $ 192        
Cash paid at closing     170        
Subsequent consideration and other     $ 22        
Additional cash consideration   $ 25          
Working capital adjustment / reduction       $ 3