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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2023 CAD ($) license | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | May 31, 2024 CAD ($)
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Spectrum license acquisition, expense |  | $ 72 | $ 74 |
Media |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment loss recognised in profit or loss, intangible assets and goodwill |  | $ 15 | $ 0 |
Spectrum licences |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Number of spectrum licenses won | license | 860 |  |  |
Population covered by license (percent) | 87.00% |  |  |
Spectrum license acquisition, expense | $ 475 |  |  |
Intangible assets acquired by way of government grant |  |  |  | $ 480

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