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Taxation - Summary of taxation charge (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Major components of tax expense (income) [abstract]
– Current	$ 4,436	$ 3,726	$ 3,270
– Deferred	(289)	516	695
Total taxation charge	$ 4,147	$ 4,242	$ 3,965

- 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)]

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