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Business acquisitions and dispositions - Divestiture of Assets (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2017 | Jun. 30, 2017 CAD ($) location | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Mar. 17, 2017 megahertz
Business Combinations1 [Abstract] |  |  |  |  |
Percentage of postpaid subscribers sold | 25.00% |  |  |  |
Number of retail locations sold | location |  | 15 |  |  |
Disposition of intangibles and other assets | $ |  | $ 323 | $ 323 | $ 0 |
Number of megahertz transferred |  |  |  |  | 40
Total number of megahertz |  |  |  |  | 700
Number of megahertz in wireless spectrum |  |  |  |  | 2,500

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- Definition The cash inflow from the disposal of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets. [Refer: Intangible assets other than goodwill; Investment property; Other non-current assets; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_16&doctype=Standard -URIDate 2017-03-09 + Details
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