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Income Taxes - Components of Income Tax Expense (Recovery) Recognized in Consolidated Statements of Income (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current tax
Current year	CAD 608	CAD 659
Adjustments to prior year	(38)	(228)
Current tax	570	431
Deferred tax
Change related to temporary differences	(803)	(235)
Impact of U.S. Tax Reform	472
Income tax expense	CAD 239	CAD 196

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- Definition

Adjustments of tax expense (income) recognised in the period for current tax of prior periods.

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The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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The amount of current tax expense (income) and adjustments for the current tax of prior periods. [Refer: Current tax expense (income); Adjustments for current tax of prior periods]

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