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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, 2023 | Dec. 31, 2022 | Apr. 03, 2023
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds from sales of investments other than investments accounted for using equity method | $ 829 | $ 829 | $ 0 |
Business Combination And Other, Consideration Transferred, Acquisition-Date Fair Value, Net Of Cash Acquired |  | (16,215) | (9) |
Proceeds from sales of interests in associates |  | 2,155 |  |
Shaw Communications Inc. |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Consideration Transferred, Acquisition-Date Fair Value, Net |  | (16,903) | 0 |
Cash consideration |  |  |  | $ 19,033
Bank Advances Recognised As Of Acquisition Date |  |  |  | $ (25)
Other |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Consideration Transferred, Acquisition-Date Fair Value, Net |  | (141) | $ (9) |
Cash consideration | $ 153 | $ 153 |  |

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