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Impairment of assets (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of assets |  | $ 472 | $ 102
Explanation of period over which management has projected cash flows, period |  | 5 years |
BELL MEDIA |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of assets | $ 452 |  |
Cash-generating units |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Explanation of period over which management has projected cash flows, period | 5 years |  | 5 years
Discount Rate (as a percent) |  |  | 7.50%
Perpetuity Growth Rate (as a percent) |  |  | 0.00%
Recoverable amount of asset or cash-generating unit | $ 942 |  | $ 464
Cash-generating units | Minimum |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Discount Rate (as a percent) | 8.00% |  |
Perpetuity Growth Rate (as a percent) | (1.00%) |  |
Cash-generating units | Maximum |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Discount Rate (as a percent) | 9.50% |  |
Perpetuity Growth Rate (as a percent) | 0.00% |  |
Indefinite-Lived Intangible Assets |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of assets |  |  | 85
Indefinite-Lived Intangible Assets | BELL MEDIA |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of assets | $ 291 |  |
Finite-Lived Intangible Assets | BELL MEDIA |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of assets | 146 |  |
Property, plant and equipment |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of assets |  |  | $ 8
Property, plant and equipment | BELL MEDIA |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of assets | $ 15 |  |

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- Definition The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_d_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_e_v&doctype=Standard -URIDate 2020-01-01 + Details
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