Earnings per ordinary share - Summary of Earnings Per Ordinary Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic earnings/(loss) per ordinary share
Profit available for equity holders	$ 750	$ 375	$ 266
Basic weighted average number of ordinary shares (millions)	169	181	183
Basic earnings per ordinary share	$ 4.438	$ 2.072	$ 1.454
Diluted earnings/(loss) per ordinary share
Profit available for equity holders	$ 750	$ 375	$ 266
Diluted weighted average number of ordinary shares (millions)	170	182	184
Diluted earnings per ordinary share	$ 4.412	$ 2.06	$ 1.446
Basic and diluted share denominators are calculated as follows:
Weighted average number of ordinary shares in issue	177	187	187
Weighted average number of treasury shares	(8)	(6)	(4)
Basic weighted average number of ordinary shares	169	181	183
Dilutive potential ordinary shares	1	1	1
Diluted weighted average number of ordinary shares	170	182	184

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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Weighted average number of ordinary shares in issue.

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