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BUSINESS COMBINATIONS - Pro Forma Disclosures (Details) - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about business combination [line items] |  |  |
Revenue |  | $ 20,604 | $ 19,308
Net income for the year |  | $ 1,734 | 849
Shaw Communications Inc. |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Revenue | $ 3,200 |  |
Net income for the year | $ 200 |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  | 20,400
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  | $ 650

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