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Business acquisitions and dispositions - National Expansion of HBO and The Movie Network Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 01, 2016
Disclosure of detailed information about business combination [line items] |  |  |  |
Business acquisitions | $ 1,649 | $ 404 |  |
Corus |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Cash consideration |  |  |  | $ (218)
Business acquisitions |  |  | $ 21 |

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