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Business acquisitions and disposition - Narrative (Details) - CAD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jul. 02, 2024
Jun. 10, 2024
Jun. 07, 2024
Disclosure of detailed information about business combination [line items]        
Cash transferred, net of cash acquired       $ 418
Disposal of non-current assets or disposal classified as held for sale and discontinued operations, consideration expected     $ 1,000  
OUTFRONT Media        
Disclosure of detailed information about business combination [line items]        
Consideration recognized as of acquisition date       $ 429
Revenue of acquiree since acquisition date $ 8      
Revenue of combined entity as if combination occurred at beginning of period $ 12,064      
Stratejm | Major business combination        
Disclosure of detailed information about business combination [line items]        
Consideration recognized as of acquisition date   $ 78    
Contingent consideration   $ 20    
Consideration payable, term   3 years