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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disclosure of operating segments [abstract]
Current income tax expense	$ (101)	$ (232)	$ (297)	$ (419)
Deferred income tax recovery / (expense)	96	(7)	(72)	(56)
Income tax expense	$ (5)	$ (239)	$ (369)	$ (475)

- Definition

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

+ References + Details