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REVENUE - Disaggregation of Revenue (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] |  |
Total revenue | $ 20,604 | $ 19,308
External Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 20,604 | 19,308
Internal Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 0 | 0
Service revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 18,066 | 16,845
Equipment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 2,538 | 2,463
Operating segments | Wireless |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 10,595 | 10,222
Operating segments | Wireless | External Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 10,528 | 10,184
Operating segments | Wireless | Internal Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 67 | 38
Operating segments | Wireless | Service revenue | External Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 8,041 | 7,764
Operating segments | Wireless | Service revenue | Internal Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 67 | 38
Operating segments | Wireless | Equipment revenue | External Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 2,487 | 2,420
Operating segments | Cable |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 7,876 | 7,005
Operating segments | Cable | External Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 7,801 | 6,964
Operating segments | Cable | Internal Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 75 | 41
Operating segments | Cable | Service revenue | External Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 7,750 | 6,921
Operating segments | Cable | Service revenue | Internal Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 75 | 41
Operating segments | Cable | Equipment revenue | External Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 51 | 43
Operating segments | Media |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 2,484 | 2,335
Operating segments | Media | External Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 2,215 | 2,086
Operating segments | Media | Internal Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 269 | 249
Corporate items |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 83 | 77
Corporate items | External Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 60 | 74
Corporate items | Internal Customers |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | 23 | 3
Intercompany eliminations |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total revenue | $ (434) | $ (331)

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_114&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_113_a&doctype=Standard -URIDate 2024-03-27 + Details
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