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SEGMENTED INFORMATION - Schedule of components of income tax expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of operating segments [abstract]
Current tax expense	$ (861)	$ (286)
Deferred income tax recovery (expense)	1,109	(327)
Income tax recovery (expense)	$ 248	$ (613)

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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