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Business acquisitions and dispositions - Acquisition of MTS (Details) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 CAD ($) location | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Mar. 17, 2017 CAD ($) shares megahertz | Dec. 31, 2016 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Deferred tax asset |  | $ (3,051) | $ (2,726) |  | $ (2,496)
Percentage of postpaid subscribers sold | 25.00% |  |  |  |
Disposition of intangibles and other assets |  | 68 | 323 |  |
Number of megahertz transferred | megahertz |  |  |  | 40 |
Total number of megahertz | megahertz |  |  |  | 700 |
Number of megahertz in wireless spectrum | megahertz |  |  |  | 2,500 |
Non-capital tax loss carryforwards |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Unused tax loss carryforward |  | 645 | 208 |  |
Deferred tax asset |  | 129 | 17 |  | $ 21
MTS |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Total cost to be allocated |  |  |  | $ 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 |  | 730 |  |  |
Earnings of acquiree since acquisition date |  | 100 |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  | 22,950 |  |
Earnings of combined entity as if combination occurred at beginning of period |  |  | 3,061 |  |
Number of retail locations sold | location | 15 |  |  |  |
Disposition of intangibles and other assets | $ 323 |  |  |  |
MTS | Non-capital tax loss carryforwards |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Unused tax loss carryforward |  | $ 478 | $ 64 | $ 1,500 |
Deferred tax asset |  |  |  | $ 300 |

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