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Business acquisitions and dispositions - Acquisition of Q9 Networks Inc. Summary (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Oct. 03, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of detailed information about business combination [line items] |  |  |
Goodwill | $ 10,428 |  | $ 8,958
Q9 |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Cash consideration |  | $ 170 |
Fair value of previously held interest in Q9 and favourable purchase option |  | 131 |
Note receivable from Q9 |  | 517 |
Total cost to be allocated |  | 818 |
Trade and other receivables |  | 19 |
Other non-cash working capital |  | (39) |
Property, plant and equipment |  | 311 |
Finite-life intangible assets |  | 267 |
Long-term debt |  | (7) |
Deferred tax liabilities |  | (69) |
Other non-current liabilities |  | (16) |
Total costs to be allocated, excluding cash and cash equivalents and goodwill |  | 466 |
Cash and cash equivalents |  | 12 |
Fair value of net assets acquired |  | 478 |
Goodwill |  | $ 340 |

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