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INCOME TAXES - Summary of Net Deferred Income Tax Liability (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of changes in deferred tax liability (asset) [abstract]
Balance – beginning of year	$ 9,073	$ 9,344	$ 8,970
Deferred income tax expense (recovery)	640	(241)	231
Deferred income tax expense (recovery) included in other comprehensive income	4	(5)	(4)
Foreign exchange adjustments	(29)	(25)	147
Business combinations (note 7)	1,287	0	0
Balance – end of year	$ 10,975	$ 9,073	$ 9,344

X

- Definition

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

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The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)]

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- Definition

The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)]

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