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Business acquisitions and dispositions - Narrative (Details) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2025 CAD ($) advertising_display | Dec. 31, 2025 CAD ($) | Dec. 31, 2024 CAD ($) | Aug. 01, 2025 USD ($) | Aug. 01, 2025 CAD ($) | Oct. 04, 2024 advertising_display | Jul. 02, 2024 CAD ($) | Jun. 30, 2024 CAD ($) | Jun. 07, 2024 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Early debt redemption costs |  | $ (249) | $ 0 |  |  |  |  |  |
Number of advertising displays disposed | advertising_display | 669 |  |  |  |  |  |  |  |
Disposal of non-current assets or disposal classified as held for sale and discontinued operations, consideration expected |  |  |  |  |  |  |  | $ 1,000 |
OUTEDGE advertising displays | Assets and liabilities classified as held for sale |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Number of advertising displays disposed | advertising_display |  |  |  |  |  | 669 |  |  |
Proceeds from disposition of advertising displays | $ 14 |  |  |  |  |  |  |  |
Ziply Fiber |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  | $ 3,640 | $ 5,010 |  |  |  |
Revenue of acquiree since acquisition date |  | 392 |  |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  | 25,019 |  |  |  |  |  |  |
Profit (loss) of acquiree since acquisition date |  | (87) |  |  |  |  |  |  |
Early debt redemption costs |  | 109 |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  | $ 6,496 |  |  |  |  |  |  |
OUTFRONT Media |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  |  |  |  |  |  | $ 429
Revenue of acquiree since acquisition date |  |  | 65 |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  | 24,457 |  |  |  |  |  |
Cash transferred, net of cash acquired |  |  |  |  |  |  |  |  | $ 418
Stratejm |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  |  |  |  | $ 78 |  |
Revenue of acquiree since acquisition date |  |  | 10 |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  | $ 24,421 |  |  |  |  |  |
Cash transferred, net of cash acquired |  |  |  |  |  |  | 73 |  |
Contingent consideration, maximum amount payable |  |  |  |  |  |  | $ 20 |  |

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