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Income taxes - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Mar. 17, 2017 | Dec. 31, 2016
Income Taxes [Abstract] |  |  |  |
Applicable statutory tax rate | 27.00% | 27.10% |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax asset | $ (3,051) | $ (2,726) |  | $ (2,496)
Non-capital tax loss carryforwards |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax loss carryforward | 645 | 208 |  |
Deferred tax asset | 129 | 17 |  | $ 21
Unused tax losses for which no deferred tax asset recognised | 167 | 144 |  |
Non-capital tax loss carryforwards | MTS |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax loss carryforward | 478 | 64 | $ 1,500 |
Deferred tax asset |  |  | $ 300 |
Capital loss carryforwards |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax loss carryforward | $ 806 | $ 827 |  |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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