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Business acquisitions and dispositions - National Expansion of HBO and The Movie Network Summary (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 01, 2016 | Dec. 31, 2015
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Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill | $ 10,428 | $ 8,958 |  |
Corus |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Cash consideration |  |  | $ (218) |
Finite-life intangible assets |  |  | 8 |
Non-current assets recognised as of acquisition date |  |  | 1 |
Current liabilities recognised as of acquisition date |  |  | (3) |
Non-current liabilities recognised as of acquisition date |  |  | (8) |
Fair value of net assets acquired |  |  | (2) |
Goodwill |  |  | $ 220 |
Goodwill expected to be deductible for tax purposes |  |  |  | $ 163
Goodwill Annual Rate Declining Balance |  |  |  | 7.00%

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