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REVENUE - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Decrease in amortization expense | $ 115 |
Minimum |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Deferred Commission Cost Assets, Amortization Period | 12 months |
Maximum |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Deferred Commission Cost Assets, Amortization Period | 90 months |
Service revenue | Minimum |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Expected period of recognition (in years) | 3 years |
Service revenue | Maximum |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Expected period of recognition (in years) | 5 years |
Wireless |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Deferred Commission Cost Assets, Amortization Period | 32 months | 24 months
Wireless | Service revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Typical payment period | 30 days |
Wireless | Equipment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Typical payment period | 24 months |
Cable |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Deferred Commission Cost Assets, Amortization Period | 32 months | 24 months
Cable | Service revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Typical payment period | 30 days |
Cable | Equipment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Typical payment period | 24 months |
Media |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Typical payment period | 30 days |

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