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Business combination - FV of Net Assets Acquired CMQ U.S. (Details) - CAD ($)
$ in Millions
7 Months Ended
Jun. 03, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 329 $ 194 $ 194
CMQ U.S.        
Business Acquisition [Line Items]        
Measurement period adjustment, Other long-term liabilities   $ 1    
Cash and cash equivalents $ 22      
Accounts receivable, net 2      
Properties 54      
Intangible assets 27      
Accounts payable and accrued liabilities (13)      
Other long-term liabilities (6)      
Total identifiable assets and liabilities 86      
Goodwill 52      
Fair value of net assets acquired 138      
Fair value of previously held equity method investment $ 138