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Business acquisitions - FV of Net Assets Acquired DRTP (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 22, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]        
Goodwill   $ 344 $ 328 $ 329
Cash, net of cash acquired   $ 0 $ 0 $ 398
DRTP        
Business Acquisition [Line Items]        
Accounts receivable, net $ 5      
Properties 436      
Intangible assets 4      
Accounts payable and accrued liabilities (1)      
Deferred taxes (55)      
Total identifiable assets and liabilities 389      
Goodwill 90      
Fair value of net assets acquired 479      
Cash, net of cash acquired 398      
Fair value of previously held equity method investment 81      
Total consideration $ 479