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Assets held for sale - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Feb. 08, 2024 radio_station
Disclosure of financial assets [line items] |  |  |  |
Gain (losses) on disposals of investments |  | $ 80 | $ 24 |
Forecast |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Gain (losses) on disposals of investments | $ 9 |  |  |
Classification of assets as held for sale |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Number of radio stations held for sale | radio_station |  |  |  | 45
Other disposals of assets | Forecast |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Proceeds from sale | $ 54 |  |  |
Assets and liabilities classified as held for sale |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Revenue |  | $ 39 | $ 42 |

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