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Goodwill - Disclosure of changes in carrying amounts of goodwill (Details) - Goodwill - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period | $ 8,958 | $ 8,377
Acquisitions and other | 1,470 | 581
Goodwill, end of period | 10,428 | 8,958
BELL WIRELESS |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period | 2,304 | 2,303
Acquisitions and other | 728 | 1
Goodwill, end of period | 3,032 | 2,304
BELL WIRELINE |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period | 3,831 | 3,491
Acquisitions and other | 666 | 340
Goodwill, end of period | 4,497 | 3,831
BELL MEDIA |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period | 2,823 | 2,583
Acquisitions and other | 76 | 240
Goodwill, end of period | $ 2,899 | $ 2,823

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- Definition The increase in intangible assets and goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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