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Schedule of Components of Income Tax Expense (Recovery) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Current tax
Current tax	$ 96	$ 208	$ 229	$ 348
Deferred tax
Deferred tax	20	66	88	518
Income tax expense	$ 116	$ 274	$ 317	$ 866

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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