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Impairment of assets (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | $ 449 | $ 1 | $ 456 | $ 5
Decrease in perpetuity growth rate resulting in recoverable amount being equal to carrying value (as a percent) | (0.60%) |  | (0.60%) |
Increase in discount rate resulting in recoverable amount being equal to carrying amount (as a percent) | 0.40% |  | 0.40% |
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 |  |  | 5 years |
Recoverable amount of asset or cash-generating unit | $ 942 |  | $ 942 |
Cash-generating units | Minimum |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Discount rate applied to cash flow projections | 8.00% |  | 8.00% |
Growth rate used to extrapolate cash flow projections | (1.00%) |  | (1.00%) |
Cash-generating units | Maximum |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Discount rate applied to cash flow projections | 9.50% |  | 9.50% |
Growth rate used to extrapolate cash flow projections | 0.00% |  | 0.00% |
Indefinite-lived intangible assets |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | $ 291 |  |  |
Finite-lived intangible assets |  |  |  |
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 | $ 15 |  |  |

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