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SUPPLEMENTAL CASH FLOW INFORMATION - Acquisitions and other strategic transactions, net of cash acquired (Details) - CAD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Apr. 03, 2023
Disclosure of detailed information about borrowings [line items] |  |  |  |
Cash received on sale of Cogeco shares | $ 829 | $ 0 | $ 829 |
Acquisitions and other strategic transactions, net of cash acquired |  | (475) | (16,215) |
Proceeds from sales of interests in associates |  | 2,155 |  |
Shaw Communications Inc. |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Net cash consideration | (16,903) | 0 | (16,903) |
Cash consideration for 3800 MHz spectrum acquisition |  |  |  | $ (20,483)
Cash consideration |  |  |  | 19,033
Bank advances |  |  |  | $ 25
Aggregated individually immaterial business combinations |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Net cash consideration | (141) | 0 | (141) |
Cash consideration for 3800 MHz spectrum acquisition |  | (153) |  |
Cash consideration |  | 153 |  |
3800 MHz Spectrum Acquisition |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Cash consideration for 3800 MHz spectrum acquisition | $ 0 | $ (475) | $ 0 |

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