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Taxation - Summary of taxation charge (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Major Components Of Tax Expense Income [Abstract]
– Current	$ 3,270	$ 2,115	$ 1,132
– Deferred	695	(548)	(139)
Taxation charge	$ 3,965	$ 1,567	$ 993

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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