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INTANGIBLE ASSETS AND GOODWILL - Overview of methods and key assumptions used to determine recoverable amounts for CGUs (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of information for cash-generating units [line items] |  |
Carrying value of goodwill | $ 3,973 | $ 3,923
Operating segments | Wireless |  |
Disclosure of information for cash-generating units [line items] |  |
Carrying value of goodwill | 1,160 | 1,160
Carrying value of indefinite-life intangible assets | $ 8,465 |
Period of projected cash flows (years) | 5 years |
Terminal growth rates (%) | 0.50% |
Pre-tax discount rates (%) | 8.40% |
Operating segments | Cable |  |
Disclosure of information for cash-generating units [line items] |  |
Carrying value of goodwill | $ 1,858 | 1,808
Carrying value of indefinite-life intangible assets | $ 0 |
Period of projected cash flows (years) | 5 years |
Terminal growth rates (%) | 1.50% |
Pre-tax discount rates (%) | 7.80% |
Operating segments | Media |  |
Disclosure of information for cash-generating units [line items] |  |
Carrying value of goodwill | $ 955 | $ 955
Carrying value of indefinite-life intangible assets | $ 235 |
Period of projected cash flows (years) | 5 years |
Terminal growth rates (%) | 2.00% |
Pre-tax discount rates (%) | 9.60% |

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