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Impairment of assets (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets |  |  | $ 197 | $ 472
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 | $ 163 | $ 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 | 8.50% |  |  |
Perpetuity growth rate | (2.00%) |  |  |
Recoverable amount of asset or cash-generating unit | $ 235 | $ 942 |  |
Cash-generating units | Minimum |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Discount rate |  | 8.00% |  |
Perpetuity growth rate |  | (1.00%) |  |
Cash-generating units | Maximum |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Discount rate |  | 9.50% |  |
Perpetuity growth rate |  | 0.00% |  |
Indefinite-Lived Intangible Assets | BELL MEDIA |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | 150 | $ 291 |  |
Property, plant and equipment | BELL MEDIA |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | $ 13 | 15 |  |
Finite-Lived Intangible Assets | BELL MEDIA |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets |  | $ 146 |  |

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