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REVENUE (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | CAD 14,143 | CAD 13,702
Operating segments | Wireless: |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 8,343 | 7,916
Operating segments | Wireless: | Service revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 7,775 | 7,258
Operating segments | Wireless: | Equipment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 568 | 658
Operating segments | Cable: |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,466 | 3,449
Operating segments | Cable: | Service revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,460 | 3,443
Operating segments | Cable: | Equipment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 6 | 6
Operating segments | Cable: | Internet |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,606 | 1,495
Operating segments | Cable: | Television |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,501 | 1,562
Operating segments | Cable: | Phone |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 353 | 386
Operating segments | Business Solutions: |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 387 | 384
Operating segments | Business Solutions: | Service revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 380 | 378
Operating segments | Business Solutions: | Equipment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 7 | 6
Operating segments | Business Solutions: | Next generation |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 322 | 307
Operating segments | Business Solutions: | Legacy |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 58 | 71
Operating segments | Media: |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 2,153 | 2,146
Operating segments | Media: | Advertising |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 838 | 870
Operating segments | Media: | Subscription |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 511 | 474
Operating segments | Media: | Retail |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 352 | 325
Operating segments | Media: | Other |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 452 | 477
Corporate items and intercompany eliminations |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | CAD (206) | CAD (193)

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