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Other expense - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) radio_station
Disclosure of information for cash-generating units [line items] |  |
Impairment loss | $ 200 | $ 82
Number of small market radio stations impaired | radio_station |  | 2
Explanation of period over which management has projected cash flows, period | 5 years |
Loss on investment, equity loss of share obligation | $ 20 | $ 20
Losses on disposals of investments | $ 34 |
Cash-generating units |  |
Disclosure of information for cash-generating units [line items] |  |
Explanation of period over which management has projected cash flows, period | 5 years | 5 years
Discount rate applied to cash flow projections |  | 8.50%
Growth rate used to extrapolate cash flow projections |  | 0.00%
Recoverable amount of asset or cash-generating unit | $ 515 | $ 67
Bottom of range | Cash-generating units |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate applied to cash flow projections | 8.00% |
Top of range | Cash-generating units |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate applied to cash flow projections | 8.50% |
Finite-Lived Intangible Assets |  |
Disclosure of information for cash-generating units [line items] |  |
Impairment loss | $ 14 | 12
Indefinite-Lived Intangible Assets |  |
Disclosure of information for cash-generating units [line items] |  |
Impairment loss | 145 | $ 70
BELL MEDIA | Indefinite-Lived Intangible Assets |  |
Disclosure of information for cash-generating units [line items] |  |
Impairment loss | $ 31 |

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