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Business acquisitions and dispositions - Summary of Acquisition of AlarmForce Industries Inc. (Details) - CAD ($)
$ in Millions
Jun. 30, 2018
Jan. 05, 2018
Dec. 31, 2017
Disclosure of detailed information about business combination [line items]      
Goodwill $ 10,568   $ 10,428
AlarmForce      
Disclosure of detailed information about business combination [line items]      
Cash consideration   $ 181  
Issuance of 22,531 BCE common shares   1  
Total cost to be allocated   182  
Assets held for sale   68  
Property, plant and equipment   8  
Finite-life intangible assets   34  
Indefinite-life intangible assets   1  
Deferred tax liabilities   (7)  
Other non-current liabilities   (1)  
Total costs to be allocated, excluding cash and cash equivalents and goodwill   103  
Cash and cash equivalents   4  
Fair value of net assets acquired   107  
Goodwill   $ 75