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REVENUE - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | $ 13,916 | $ 15,073
Operating segments | Wireless |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 8,530 | 9,250
Operating segments | Wireless | Service revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 6,579 | 7,156
Operating segments | Wireless | Equipment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,951 | 2,094
Operating segments | Cable |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,946 | 3,954
Operating segments | Cable | Service revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,936 | 3,940
Operating segments | Cable | Equipment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 10 | 14
Operating segments | Media |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,606 | 2,072
Corporate items and intercompany eliminations |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | $ (166) | $ (203)

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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 2020-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_113_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_114&doctype=Standard -URIDate 2020-01-01 + Details
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