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Assets and liabilities held for sale - Narrative (Details) $ in Millions |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2025 CAD ($) | Oct. 04, 2024 CAD ($) advertising_display | Jun. 30, 2025 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Feb. 08, 2024 radio_station
Disclosure of financial assets [line items] |  |  |  |  |  |
Number of radio stations held for sale | radio_station |  |  |  |  |  | 45
Gain (losses) on disposals of investments |  |  |  | $ 57 | $ 80 |
Number of advertising displays to be disposed | advertising_display |  | 669 |  |  |  |
Estimated proceeds from disposition of advertising displays |  | $ 14 |  |  |  |
Share of profit (loss) of associates and joint ventures accounted for using equity method, operations |  |  |  | 10 | 28 |
MSLE |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Assets (liabilities) |  |  |  | (493) |  |
Share of profit (loss) of associates and joint ventures accounted for using equity method, operations |  |  |  | 6 |  |
Profit (loss) from discontinued operations |  |  |  |  | 25 |
Assets and liabilities classified as held for sale |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Revenue |  |  |  | 35 | 39 |
Assets (liabilities) |  |  |  | (449) | 45 |
Assets and liabilities classified as held for sale | MSLE |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Assets (liabilities) |  |  |  | $ 493 | $ 0 |
Forecast |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Proceeds from sale |  |  | $ 54 |  |  |
Gain (losses) on disposals of investments |  |  | $ 9 |  |  |
Forecast | MSLE |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Proceeds from sale | $ 4,700 |  |  |  |  |
Gain recognised on disposal of assets or disposal groups constituting discontinued operation | $ 5,200 |  |  |  |  |

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