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Related party transactions - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Associates and Joint Arrangements |  |
Disclosure of transactions between related parties [line items] |  |
Recognized revenue, related parties | $ 11 | $ 16
Incurred expenses, related parties | 177 | 180
Bell Canada | Master Trust Fund |  |
Disclosure of transactions between related parties [line items] |  |
Recognized revenue, related parties | $ 10 | $ 10

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of revenue arising from the rendering of services in related party transactions. [Refer: Revenue; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_21_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of services received in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_21_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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