INCOME TAXES - Reconciliation of Effective Income Tax Rate (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Earnings before income tax	$ 1,742	$ 1,025
Statutory tax rate	27.00%	27.00%
Income tax at statutory rate	$ 470	$ 277
Tax rate changes on deferred income tax balances	(1)	1
Changes in estimate and other	(6)	18
U.S. Tax Reform	0	(166)
Permanent items	1	12
Income tax expense	$ 464	$ 142

The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)]

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The applicable income tax rate.

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit]

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The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate]

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Income Taxes [Abstract]

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Tax Effect From Change In Law

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Tax Effect Of Other Permanent Differences

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