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INCOME TAXES - Deferred Income Tax Balances (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | $ (1,918) | $ 440 |
Net deferred income tax (recovery) expense and liability | 9,967 | 11,917 | $ 11,433
Property, plant and equipment |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | (2,348) | 484 |
Deferred income tax liability | 12,814 | 14,666 |
Decommissioning and Restoration |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | 259 | 46 |
Deferred income tax assets | (2,092) | (1,854) |
Employee retirement benefit plans |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | 32 | 15 |
Deferred income tax assets | (576) | (585) |
Tax loss carryforwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | 16 | (63) |
Deferred income tax assets | (156) | (172) |
Other deferred income tax (assets) liabilities |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | 123 | (42) |
Deferred income tax assets | $ (23) | $ (138) |

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