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Business acquisitions and dispositions - Narrative (Details) $ in Millions, $ in Millions |  |  | 6 Months Ended | 7 Months Ended | 12 Months Ended |  |  |  |  |
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Oct. 04, 2024 CAD ($) advertising_display | May 03, 2023 CAD ($) | Jun. 30, 2025 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2025 CAD ($) | Dec. 31, 2025 USD ($) | Jul. 02, 2024 CAD ($) | Jun. 10, 2024 CAD ($) | Jun. 07, 2024 CAD ($) | Jun. 01, 2023 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash transferred, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 156
Number of advertising displays to be disposed | advertising_display | 669 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated proceeds from disposition of advertising displays | $ 14 |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of non-current assets or disposal classified as held for sale and discontinued operations, consideration expected |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Consideration payable, term |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years
Production Studios |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests sold |  | 63.00% |  |  |  |  |  | 63.00% |  |  |  |  |  |
Proceeds from sale of operations |  | $ 211 |  |  |  |  |  | $ 211 |  |  |  |  |  |
Gain recognised on disposal of assets or disposal groups constituting discontinued operation |  | 79 |  |  |  |  |  | 79 |  |  |  |  |  |
Tax expense recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  | $ 17 |  |  |  |  |  |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  | $ 7,000 | $ 5,100 |  |  |  |
Consideration transferred, liabilities assumed, debt |  |  |  |  |  |  |  |  | 2,000 | 1,450 |  |  |  |
Proceeds from sale of operations |  |  | $ 54 |  |  |  |  |  |  |  |  |  |  |
OUTEDGE |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  |  |  |  |  |  |  |  |  |  | $ 429 |
Cash transferred, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  | 418 |
Revenue of acquiree since acquisition date |  |  |  |  | $ 65 |  |  |  |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  | $ 24,457 |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  |  |  |  |  | $ 429 |
Stratejm |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  |  |  |  |  |  |  |  | $ 78 |  |  |
Cash transferred, net of cash acquired |  |  |  |  |  |  |  |  |  |  | 73 |  |  |
Revenue of acquiree since acquisition date |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  | 24,421 |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  | 11 |  |  |
Contingent consideration, maximum amount payable |  |  |  |  |  |  |  |  |  |  | 20 |  |  |
Business acquisition, contingent consideration, liability |  |  |  | 11 | 11 |  | 11 |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  |  |  | $ 89 |  |  |
Zipfy Fiber | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  |  |  |  |  |  | $ 5,000 | $ 3,650 |  |  |  |
FX Innovation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157
Revenue of acquiree since acquisition date |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  |  | $ 24,715 |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 6
Contingent consideration, maximum amount payable |  |  |  |  |  |  |  |  |  |  |  |  |  | 7
Business acquisition, contingent consideration, liability |  |  |  | $ 2 | $ 2 |  | $ 2 |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | 163
Cash consideration payable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12

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