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Other (expense) income - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of subsidiaries [line items]    
(Loss) gain on investment, equity loss of share obligation $ 42 $ 49
Gain (losses) on disposals of investments 24 $ (6)
Createch    
Disclosure of subsidiaries [line items]    
Gain (losses) on disposals of investments 39  
SUBSIDIARY    
Disclosure of subsidiaries [line items]    
Gain (losses) on disposals of investments $ (13)