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Other (expense) income - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 CAD ($) radio_station | Dec. 31, 2016 CAD ($)
Disclosure of information for cash-generating units [line items] |  |
Impairment loss | $ 82 | $ 9
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 | 11
Investments in associates and joint ventures loss on sale of portion of operations |  | 46
(Losses) gains on investments | $ (5) | 58
Investments accounted for using equity method |  | 34
Remeasurement of previously held equity interest |  | $ 12
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 |
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 | $ 67 |
Finite-Lived Intangible Assets |  |
Disclosure of information for cash-generating units [line items] |  |
Impairment loss | 12 |
Indefinite-Lived Intangible Assets |  |
Disclosure of information for cash-generating units [line items] |  |
Impairment loss | $ 70 |

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