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Retirement benefits - Summary of Estimated Future Benefit Payments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 106 | $ 112
Due within one year [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 5 | 5
Between one and five years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | 20 | 21
More than 5 years [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Estimated future benefit payments | $ 81 | $ 86
Plan [member] | United Kingdom [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Average duration of obligation (years) | 12 years | 13 years
Plan [member] | United States [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Average duration of obligation (years) | 7 years 1 month 6 days | 7 years 6 months
US post-retirement plan [member] |  |
Disclosure of net defined benefit liability/asset [line items] |  |
Average duration of obligation (years) | 7 years 4 months 24 days | 8 years

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- Definition The estimate of the amounts expected to be paid from defined benefit plan in future. [Refer: Defined benefit plans [domain]; Maturity [axis]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_c&doctype=Standard -URIDate 2024-03-27 + Details
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