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INTANGIBLE ASSETS AND GOODWILL - Overview of methods and key assumptions used to determine recoverable amounts for CGUs (Details) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of information for cash-generating units [line items] |  |
Goodwill | CAD 3,905 | CAD 3,905
Operating segments | Wireless |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 1,160 | 1,160
Carrying value of indefinite-life intangible assets | CAD 6,733 |
Period of projected cash flows (years) | 5 years |
Terminal growth rates (%) | 0.50% |
Pre-tax discount rates (%) | 7.90% |
Operating segments | Cable |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | CAD 1,379 | 1,379
Carrying value of indefinite-life intangible assets | CAD 0 |
Period of projected cash flows (years) | 5 years |
Terminal growth rates (%) | 1.00% |
Pre-tax discount rates (%) | 7.60% |
Operating segments | Media |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | CAD 937 | CAD 937
Carrying value of indefinite-life intangible assets | CAD 241 |
Period of projected cash flows (years) | 5 years |
Terminal growth rates (%) | 2.00% |
Pre-tax discount rates (%) | 12.00% |

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