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Adoption of IFRS 15 - Reconciliation of Deficit (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Deficit | $ (4,937) | $ (4,938) | $ (4,978)
2017 as previously reported | IFRS 15 |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Deficit |  | (6,080) | (6,040)
IFRS 15 impacts | IFRS 15 |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Deficit |  | 1,142 | 1,062
Timing of revenue recognition | IFRS 15 |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Deficit |  | 873 | 809
Cost to obtain a contract | IFRS 15 |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Deficit |  | $ 269 | $ 253

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