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SEGMENTED INFORMATION - Schedule of components of income tax expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Segments [Abstract]
Current tax expense	$ (136)	$ (88)	$ (363)	$ (105)
Deferred income tax expense	(203)	(31)	(129)	(139)
Income tax expense	$ (339)	$ (119)	$ (492)	$ (244)

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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