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Business acquisitions and disposition - Acquisition of EBOX (Details) - CAD ($)
$ in Millions
1 Months Ended 6 Months Ended 10 Months Ended
Dec. 31, 2022
Jun. 30, 2023
Dec. 31, 2022
Feb. 28, 2022
Certain Production Studios and Production Studios Under Construction        
Disclosure of detailed information about business combination [line items]        
Proportion of ownership interests held by non-controlling interests 63.00%      
Forecast        
Disclosure of detailed information about business combination [line items]        
Proceeds from sale of operations   $ 220    
EBOX        
Disclosure of detailed information about business combination [line items]        
Cash consideration       $ 153
Financial assets recognised as of acquisition date       $ 139
Revenue of acquiree since acquisition date     $ 41