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Goodwill - Changes in Carrying Amounts of Goodwill (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill | $ 10,604 | $ 10,667
Discontinued operations |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill | 115 |
BELL WIRELESS |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill | 3,046 | 3,046
BELL WIRELINE |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill | 4,612 | 4,675
BELL MEDIA |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill | 2,946 | 2,946
Goodwill |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill | 10,604 | 10,667
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period |  | 10,658
Acquisitions and other | 52 | 9
Goodwill | Discontinued operations |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Discontinued operations | (115) |
Goodwill | BELL WIRELESS |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill | 3,046 | 3,046
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period |  | 3,046
Acquisitions and other | 0 | 0
Goodwill | BELL WIRELESS | Discontinued operations |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Discontinued operations | 0 |
Goodwill | BELL WIRELINE |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill | 4,612 | 4,675
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period |  | 4,681
Acquisitions and other | 52 | (6)
Goodwill | BELL WIRELINE | Discontinued operations |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Discontinued operations | (115) |
Goodwill | BELL MEDIA |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill | 2,946 |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Goodwill, beginning of period |  | 2,931
Acquisitions and other | 0 | $ 15
Goodwill | BELL MEDIA | Discontinued operations |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |
Discontinued operations | $ 0 |

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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 2020-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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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 assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_a&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_135_a&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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