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Goodwill - Changes in Carrying Amounts of Goodwill (Details) - Goodwill - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period | $ 10,428 | $ 8,958
Acquisitions and other | 230 | 1,470
Goodwill, end of period | 10,658 | 10,428
BELL WIRELESS |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period | 3,032 | 2,304
Acquisitions and other | 16 | 728
Goodwill, end of period | 3,048 | 3,032
BELL WIRELINE |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period | 4,497 | 3,831
Acquisitions and other | 182 | 666
Goodwill, end of period | 4,679 | 4,497
BELL MEDIA |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period | 2,899 | 2,823
Acquisitions and other | 32 | 76
Goodwill, end of period | $ 2,931 | $ 2,899

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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 2018-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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