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Adoption of IFRS 15 - Reconciliation of Deficit (Details) - CAD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Deficit | $ (4,811) | $ (4,938) | $ (5,438)
2017 as previously reported |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Deficit |  |  | (6,466)
Increase (Decrease) Due to Application of IFRS 15, Timing of Revenue Recognition |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Deficit |  |  | 777
Increase (Decrease) Due to Application of IFRS 15, Cost to Obtain a Contract |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Deficit |  |  | $ 251

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