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Assets and liabilities held for sale - Narrative (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2025 CAD ($) | Jul. 01, 2025 CAD ($) | Apr. 30, 2025 CAD ($) advertising_display | Dec. 31, 2025 CAD ($) | Jun. 30, 2026 CAD ($) | Dec. 31, 2027 CAD ($) | Dec. 31, 2025 CAD ($) | Dec. 31, 2024 CAD ($) | Oct. 01, 2025 CAD ($) | Jun. 30, 2025 radio_station | Oct. 04, 2024 advertising_display
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Number of advertising displays disposed | advertising_display |  |  | 669 |  |  |  |  |  |  |  |
Operations |  |  |  |  |  |  | $ 8 | $ 10 |  |  |
Bell Media radio stations |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Number of radio stations held for sale | radio_station |  |  |  |  |  |  |  |  |  | 45 |
Proceeds from sale of operations | $ 44 |  |  |  |  |  |  |  |  |  |
Bell Media radio stations | Other gains (losses) |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation | 3 |  |  |  |  |  |  |  |  |  |
Bell Media radio stations | Gains (losses) on fair value adjustment, investment |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation | (6) |  |  |  |  |  |  |  |  |  |
Bell Media radio stations | Assets and liabilities classified as held for sale |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 9 | 35 |  |  |
Bell Media radio stations | Forecast |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of operations |  |  |  |  | $ 53 |  |  |  |  |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  |  |  |  | $ 6 |  |  |  |  |  |
OUTEDGE advertising displays | Assets and liabilities classified as held for sale |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  |  | $ 4 |  |  |  |  |  |  |  |
Number of advertising displays disposed | advertising_display |  |  |  |  |  |  |  |  |  |  | 669
Proceeds from disposition of advertising displays |  |  | $ 14 |  |  |  |  |  |  |  |
Home Security and Monitored Alarm Assets | Assets and liabilities classified as held for sale |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of operations |  |  |  | $ 65 |  |  | 65 |  |  |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  |  |  |  |  |  | 57 |  |  |  |
Revenue |  |  |  |  |  |  | 48 | 69 |  |  |
Total proceeds from sale of operations | 170 |  |  | 170 |  |  | 170 |  | $ 170 |  |
Home Security and Monitored Alarm Assets | Forecast | Assets and liabilities classified as held for sale |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Additional proceeds from disposal of non-current assets to be received upon contingent consideration |  |  |  |  |  | $ 25 |  |  |  |  |
Home Security and Monitored Alarm Assets | Forecast | Assets and liabilities classified as held for sale | Top of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Additional proceeds from disposal of non-current assets to be received upon contingent consideration |  |  |  |  |  | $ 80 |  |  |  |  |
MSLE |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of operations |  |  |  |  |  |  | 4,700 |  |  |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  |  |  |  |  |  | 5,200 |  |  |  |
Income tax liability |  | $ 542 |  |  |  |  | 542 |  |  |  |
MSLE | Disposal of major subsidiary [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of operations |  | $ 4,700 |  |  |  |  |  |  |  |  |
MSLE | Assets and liabilities classified as held for sale |  |  |  |  |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |  |  |  |  |
Liabilities included in disposal groups classified as held for sale | $ 0 |  |  | $ 0 |  |  | $ 0 | 493 |  |  |
Operations |  |  |  |  |  |  |  | $ 6 |  |  |

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