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Business combination - FV of Net Assets Acquired CMQ Canada (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 329 $ 194 $ 194
Investment in CMQ Canada   $ 398 $ 0 $ 0
CMQ Canada        
Business Acquisition [Line Items]        
Accounts receivable, net $ 7      
Properties 42      
Intangible assets 5      
Accounts payable and accrued liabilities (2)      
Long-term debt maturing within one year (11)      
Other long-term liabilities (4)      
Total identifiable assets and liabilities 37      
Goodwill 10      
Fair value of net assets acquired 47      
Investment in CMQ Canada $ 47