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SEGMENTED INFORMATION - Schedule of components of income tax expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Segments [Abstract]
Current tax recovery (expense)	$ (286)	$ (213)
Deferred income tax recovery (expense)	(327)	558
Income tax recovery (expense)	$ (613)	$ 345

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

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