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INVESTMENTS - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 CAD ($) entity | Dec. 31, 2023 CAD ($) entity | Dec. 31, 2022 CAD ($)
Disclosure of joint ventures [line items] |  |  |
Proceeds from sales of investments other than investments accounted for using equity method | $ 829,000,000 | $ 829,000,000 | $ 0
Realized losses |  | (261,000,000) | 0
Unrealized losses |  | $ 0 | 381,000,000
Number of entities disposed | entity | 2 | 2 |
Reclassification to retained earnings for disposition of FVTOCI investments, net of tax (note 20) |  | $ 0 | 0
Retained earnings |  |  |
Disclosure of joint ventures [line items] |  |  |
Reclassification to retained earnings for disposition of FVTOCI investments, net of tax (note 20) |  | $ 367,000,000 | $ 19,000,000
Maple Leaf Sports and Entertainment Limited (MLSE) |  |  |
Disclosure of joint ventures [line items] |  |  |
Proportion of ownership interest |  | 37.50% |
Maple Leaf Sports and Entertainment Limited (MLSE) | Parent Company and BCE, Inc. |  |  |
Disclosure of joint ventures [line items] |  |  |
Proportion of ownership interest |  | 75.00% |
Glentel |  |  |
Disclosure of joint ventures [line items] |  |  |
Proportion of ownership interest |  | 50.00% |
Glentel | BCE Inc. |  |  |
Disclosure of joint ventures [line items] |  |  |
Proportion of ownership interest |  | 50.00% |

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