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Earnings per ordinary share - Summary of Earnings Per Ordinary Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Basic earnings/(loss) per ordinary share |  |  |  |
Profit available for equity holders |  | $ 628 | $ 750 | $ 375
Basic weighted average number of ordinary shares (millions) |  | 161.2 | 169.0 | 181.0
Basic earnings per ordinary share |  | $ 3.896 | $ 4.438 | $ 2.072
Diluted earnings/(loss) per ordinary share |  |  |  |
Profit available for equity holders |  | $ 628 | $ 750 | $ 375
Diluted weighted average number of ordinary shares (millions) |  | 163.0 | 170.0 | 182.0
Diluted earnings per ordinary share |  | $ 3.853 | $ 4.412 | $ 2.06
Basic and diluted share denominators are calculated as follows: |  |  |  |
Weighted average number of ordinary shares in issue |  | 168.6 | 177.0 | 187.0
Weighted average number of treasury shares | [1] | (7.4) | (8.0) | (6.0)
Basic weighted average number of ordinary shares |  | 161.2 | 169.0 | 181.0
Dilutive potential ordinary shares |  | 1.8 | 1.0 | 1.0
Diluted weighted average number of ordinary shares |  | 163.0 | 170.0 | 182.0
[1] | Includes other shares that do not receive dividends

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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2024-01-01 -Paragraph 70 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2024-en-r&anchor=para_70_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2024-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2024-en-r&anchor=para_66&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2024-01-01 -Paragraph 67 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2024-en-r&anchor=para_67&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2024-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2024-en-r&anchor=para_66&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2024-01-01 -Paragraph 67 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2024-en-r&anchor=para_67&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2024-01-01 -Paragraph 70 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2024-en-r&anchor=para_70_a&doctype=Standard -URIDate 2024-03-27 + Details
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