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Taxation - Summary of prima facie tax reconciliation (Footnotes) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Groups share of profit of equity accounted units net of tax	$ 190	$ 273	$ 191

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Income tax on share of profit of equity accounted units.

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