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Taxation - Summary of prima facie tax reconciliation (Footnotes) (Detail) - USD ($) $ in Millions | 12 Months Ended
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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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- Definition Income tax on share of profit of equity accounted units. + References No definition available. + Details
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