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Business acquisitions and dispositions - Acquisition of MTS Narrative (Details) shares in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Mar. 17, 2017 CAD ($) shares | Dec. 31, 2015 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |
Deferred tax asset | $ (2,303) | $ (2,103) |  | $ (1,735)
Revenue of combined entity as if combination occurred at beginning of period | 22,913 | 21,801 |  |
Profit (loss) of combined entity as if combination occurred at beginning of period | 2,978 | 3,038 |  |
MTS |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total consideration |  |  | $ 2,933 |
Cash transferred |  |  | 1,339 |
Stock transferred |  |  | $ 1,594 |
Number of shares transferred (in shares) | shares |  |  | 27.6 |
Revenue of acquiree since acquisition date | 728 |  |  |
Profit (loss) of acquiree since acquisition date | 87 |  |  |
NON- CAPITAL LOSS CARRY- FORWARDS |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Unused tax loss carryforward | 208 | 221 |  |
Deferred tax asset | 17 | $ 21 |  | $ 12
NON- CAPITAL LOSS CARRY- FORWARDS | MTS |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Unused tax loss carryforward | $ 64 |  | $ 1,500 |
Deferred tax asset |  |  | $ 300 |

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