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Other expense - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 03, 2023
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [line items]        
Gain (loss) on investment, equity loss of share obligation     $ (581) $ (42)
Gain (losses) on disposals of investments     $ 80 24
Gains on disposal of non-current assets or disposal groups classified as held for sale and discontinued operations   $ 53    
Production Studios        
Disclosure of subsidiaries [line items]        
Proportion of ownership interests sold 63.00%   63.00%  
Proceeds from sale of operations $ 211   $ 211  
Gain recognised on disposal of assets or disposal groups constituting discontinued operation $ 79   $ 79  
Createch        
Disclosure of subsidiaries [line items]        
Gain (losses) on disposals of investments       39
Subsidiaries        
Disclosure of subsidiaries [line items]        
Gain (losses) on disposals of investments       $ 13
Real Estate Optimization Strategy        
Disclosure of subsidiaries [line items]        
Proceeds from sale of operations   $ 54