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Other expense - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
May 03, 2023
Dec. 31, 2024
Dec. 31, 2023
Disclosure of subsidiaries [line items]      
Loss on investment   $ 247 $ 581
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
Subsidiaries      
Disclosure of subsidiaries [line items]      
Gains (losses) on fair value adjustment, investment   $ 69  
Real Estate Optimization Strategy      
Disclosure of subsidiaries [line items]      
Proceeds from sale of operations     $ 54