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Income Taxes - Deferred Income Tax Balances (Details) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred | CAD 249.0 | CAD (512.0) |
Net deferred income tax liability | 11,433.0 | 11,180.0 | CAD 9,919.0
2018 |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax assets | (27.0) | (21.0) |
Deferred income tax liability | 93.0 | 195.0 |
Expected to reverse after 12 months |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax assets | (73.0) | (42.0) |
Deferred income tax liability | 11,440.0 | 11,048.0 |
Property, plant and equipment |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred | 157.0 | (864.0) |
Deferred income tax liability | 14,252.0 | 13,864.0 |
Decommissioning and Restoration |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred | 19.0 | 342.0 |
Net deferred tax assets | (1,910.0) | (1,701.0) |
Employee retirement benefit plans |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred | (5.0) | (23.0) |
Net deferred tax assets | (639.0) | (648.0) |
Tax loss carryforwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred |  | (10.0) |
Net deferred tax assets | (109.0) | (109.0) |
Partnership deferral reserve |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred |  | (78.0) |
Foreign exchange and other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred | 78.0 | 121.0 |
Net deferred tax assets | CAD (161.0) | CAD (226.0) |

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