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INVESTMENTS - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 CAD ($) entity | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) entity | Sep. 18, 2024 CAD ($)
Disclosure of joint ventures [line items] |  |  |  |
Proceeds from sales of investments other than investments accounted for using equity method | $ 829 | $ 0 | $ 829 |
Realized gain on investment |  |  | $ 261 |
Number of entities disposed | entity | 2 |  | 2 |
Reclassification to retained earnings for disposition of FVTOCI investments |  |  | $ 0 |
Other (income) expense |  | (6) | 362 |
Investments | $ 598 | $ 615 | 598 |
Retained earnings |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Reclassification to retained earnings for disposition of FVTOCI investments |  |  | 367 |
Maple Leaf Sports and Entertainment Limited (MLSE) |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest |  | 37.50% |  |
Expected controlling interest once MLSE Transaction closes (as a percent) |  | 75.00% |  |
Maple Leaf Sports and Entertainment Limited (MLSE) | Toronto Maple Leafs |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Content rights percentage owned (as a percent) |  |  |  | 50.00%
Maple Leaf Sports and Entertainment Limited (MLSE) | Toronto Raptors |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Content rights percentage owned (as a percent) |  |  |  | 50.00%
Maple Leaf Sports and Entertainment Limited (MLSE) | Parent Company and BCE, Inc. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest |  | 75.00% |  |
Maple Leaf Sports and Entertainment Limited (MLSE) | BCE Inc. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Expected percentage of ownership stake acquired (as a percent) |  |  |  | 37.50%
Percentage of ownership stake acquired, expected purchase price |  |  |  | $ 4,700
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% |  |
Total for all joint ventures | Total for all associates |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Other (income) expense |  |  | 422 |
Investments |  | $ 0 |  |
Cumulative unrecognised share of losses of joint ventures | $ 186 | $ 588 | $ 186 |

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