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Tax - Summary of Tax on (Loss)/Profit (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income tax [line items]
Income tax rate	19.00%	19.00%	19.00%
Total income tax charge for the year	$ 96	$ (20)	$ 156
Before exceptional items [member] \| United States [member]
Income tax [line items]
Total income tax charge for the year	$ 115	$ 41	$ 113

- 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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