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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
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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 |

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