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Segmented information - Revenue by Services and Products (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of products and services [line items] |  |
Revenue from rendering of services | $ 21,143 | $ 20,090
Revenue from sale of goods | 1,576 | 1,629
Revenue | 22,719 | 21,719
Wireless |  |
Disclosure of products and services [line items] |  |
Revenue from rendering of services | 7,308 | 6,602
Revenue from sale of goods | 530 | 515
Data |  |
Disclosure of products and services [line items] |  |
Revenue from rendering of services | 7,146 | 6,791
Revenue from sale of goods | 519 | 559
Local and access |  |
Disclosure of products and services [line items] |  |
Revenue from rendering of services | 3,161 | 3,089
Long distance |  |
Disclosure of products and services [line items] |  |
Revenue from rendering of services | 639 | 741
Media |  |
Disclosure of products and services [line items] |  |
Revenue from rendering of services | 2,676 | 2,685
Other services |  |
Disclosure of products and services [line items] |  |
Revenue from rendering of services | 213 | 182
Equipment and other |  |
Disclosure of products and services [line items] |  |
Revenue from sale of goods | $ 527 | $ 555

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