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Income Taxes - Deferred Income Tax Balances (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax expense (recovery) | $ 440 | $ 249 |
Net deferred income tax liability | 11,917 | 11,433 | $ 11,180
Property, plant and equipment |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax expense (recovery) | 484 | 157 |
Deferred income tax liability | 14,705 | 14,252 |
Decommissioning and Restoration |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax expense (recovery) | 46 | 19 |
Deferred income tax assets | (1,854) | (1,910) |
Employee retirement benefit plans |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax expense (recovery) | 15 | (5) |
Deferred income tax assets | (585) | (639) |
Tax loss carryforwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax expense (recovery) | (63) |  |
Deferred income tax assets | (172) | (109) |
Other deferred income tax (assets) liabilities |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax expense (recovery) | (42) | 78 |
Deferred income tax assets | $ (177) | $ (161) |

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