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Business acquisitions and dispositions - Acquisition of MTS Narrative (Details) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 CAD ($) | Jun. 30, 2017 CAD ($) location | Jun. 30, 2018 CAD ($) | Jun. 30, 2017 CAD ($) | Mar. 17, 2017 CAD ($) shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  | $ 11,217 |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  | 1,513 |
Percentage of postpaid subscribers sold |  | 25.00% |  |  |
Number of retail locations sold | location |  | 15 |  |  |
Proceeds from divestiture of businesses | $ 0 | $ 323 | $ 68 | 323 |
MTS |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Total consideration |  |  |  |  | $ 2,933
Cash consideration |  |  |  |  | 1,339
Stock transferred |  |  |  |  | $ 1,594
Number of shares transferred (in shares) | shares |  |  |  |  | 27.6
Revenue of acquiree since acquisition date |  |  |  | 271 |
Profit (loss) of acquiree since acquisition date |  |  |  | $ 38 |

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