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Business acquisitions and dispositions - National Expansion of HBO and The Movie Network Summary (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Mar. 01, 2016
Dec. 31, 2015
Disclosure of detailed information about business combination [line items]        
Goodwill $ 10,428 $ 8,958    
Corus        
Disclosure of detailed information about business combination [line items]        
Cash consideration     $ (218)  
Finite-life intangible assets     8  
Non-current assets recognised as of acquisition date     1  
Current liabilities recognised as of acquisition date     (3)  
Non-current liabilities recognised as of acquisition date     (8)  
Fair value of net assets acquired     (2)  
Goodwill     $ 220  
Goodwill expected to be deductible for tax purposes       $ 163
Goodwill Annual Rate Declining Balance       7.00%