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Retirement benefits - Additional Information (Detail) £ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2024 GBP (£) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Actuarial assumption of expected rates of mortality [Member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Mortality - per annum long term trend | 1.25% |  |  |
Other Overseas Pension Plans [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Description of retirement benefit plan | The Group also operates a number of smaller pension plans outside the UK, the most significant of which is a defined contribution plan in the US which is designed to comply with the requirements of the Internal Revenue Code Section 409A. |  |  |
Description of mortality assumptions | Mortality is the most significant demographic assumption. The current assumptions for the UK are based on the S3PA ‘light’ year of birth tables with projected mortality improvements using the CMI_2023 model and a 1.25% per annum long-term trend and a smoothing parameter (‘s-kappa’) of 7.0 with weightings of 92% and 86% for pensioners and 87% and 86% for non-pensioners, male and female respectively. In the US, the current assumptions use rates from the Pri-2012 Mortality Study and Generationally Projected with Scale MP-2021 mortality tables. |  |  |
Pensioners male [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Actuarial assumption of mortality rates | 92 | 92 |  |
Pensioners female [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Actuarial assumption of mortality rates | 86 | 86 |  |
Non-pensioners male [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Actuarial assumption of mortality rates | 87 | 87 |  |
Non-pensioners female [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Actuarial assumption of mortality rates | 86 | 86 |  |
United Kingdom [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Explanation of changes in description of retirement benefit plan | The former defined benefit plan, the InterContinental Hotels UK Pension Plan, was wound up in 2015 following the completion of the buy-out and transfer of the defined benefit obligations to Rothesay Life. |  |  |
Approximate extinguishment of the unfunded pension obligations | 70.00% |  |  |
Bank accounts pledged as security | $ 31 | £ 25 |  |
Philippines [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Net retirement benefit asset | 3 |  | $ 3 |
Plan assets | 13 |  | 12 |
Defined benefit obligation | 10 |  | 9 |
Wholly unfunded defined benefit plans [member] | Net Defined Asset Liability [Member] | Non United States [Member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined Benefit Obligation Value Of Unfunded Post Employment Plans | $ 7 |  | $ 0 | $ 0

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- Definition The mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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