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Income Taxes - Disclosure of Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Major components of tax expense (income) [abstract]
Current income tax expense	$ 196	$ 125
Deferred income tax recovery	(661)	(65)
Income tax (expense) recovery	$ (465)	$ 60

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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