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Significant accounting policies (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Revenue from rendering of services | $ (21,143) | $ (20,090) |
Revenue from sale of goods | (1,576) | (1,629) |
Operating income | 9,178 | 8,788 |
Deferred tax liability (asset) | $ 2,303 | $ 2,103 | $ 1,735
ESP |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Award vesting period | 2 years |  |
IFRS 15 |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Operating income | $ 100 |  |
Deferred tax liability (asset) | 400 |  |
Bottom of range | IFRS 15 |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Revenue from rendering of services | 1,200 |  |
Contract assets | 1,100 |  |
Top of range | IFRS 15 |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Revenue from sale of goods | 1,400 |  |
Contract assets | $ 1,300 |  |
Network infrastructure and equipment | Bottom of range |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment, estimated useful life | 2 years |  |
Network infrastructure and equipment | Top of range |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment, estimated useful life | 40 years |  |
Buildings | Bottom of range |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment, estimated useful life | 5 years |  |
Buildings | Top of range |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment, estimated useful life | 50 years |  |
Software | Bottom of range |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Finite-lived intangible assets, estimated useful life | 2 years |  |
Software | Top of range |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Finite-lived intangible assets, estimated useful life | 12 years |  |
Customer relationships | Bottom of range |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Finite-lived intangible assets, estimated useful life | 3 years |  |
Customer relationships | Top of range |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Finite-lived intangible assets, estimated useful life | 26 years |  |
Program and feature film rights | Top of range |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Finite-lived intangible assets, estimated useful life | 5 years |  |
Costs to obtain contracts with customers | Bottom of range | IFRS 15 |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Assets recognised from costs to obtain or fulfil contracts with customers | $ 300 |  |
Costs to obtain contracts with customers | Top of range | IFRS 15 |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Assets recognised from costs to obtain or fulfil contracts with customers | $ 400 |  |

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