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Business acquisitions and dispositions - Acquisition of Q9 Networks Inc. Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016 | Oct. 03, 2017
Disclosure of detailed information about business combination [line items] |  |  |
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination |  | $ 12 |
Revenue of combined entity as if combination occurred at beginning of period | $ 22,913 | 21,801 |
Profit (loss) of combined entity as if combination occurred at beginning of period | $ 2,978 | 3,038 |
Q9 |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Percentage of remaining issued and outstanding shares |  |  | 64.60%
Cash consideration |  |  | $ 170
Note receivable from Q9 |  |  | $ 517
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination |  | 12 |
Revenue of acquiree since acquisition date |  | 29 |
Profit (loss) of acquiree since acquisition date |  | $ 2 |

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- Definition The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph f -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f_i&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The fair value, at acquisition date, of other tangible or intangible assets (including a business or subsidiary of the acquirer) transferred as consideration in a business combination, that the entity does not separately disclose in the same note. [Refer: Intangible assets other than goodwill; Business combinations [member]; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph f -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f_ii&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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