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INVESTMENTS - Narrative (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Interests in Other Entities [Abstract] |  |
Realized losses | $ 0 | $ 0
Unrealized gains (losses) | $ (381,000,000) | $ 17,000,000
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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