Insurance - Summary of Analysis of Insurance Revenue (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Insurances [Abstract]
Revenue from insurance activities	$ 23	$ 21	$ 15
Insurance expenses (inclusive of overhead costs)	(29)	(23)
Insurance result	$ (6)	$ (2)

The amount of revenue arising from the groups of insurance contracts issued. Insurance revenue shall depict the provision of services arising from the group of insurance contracts at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those services. [Refer: Insurance contracts issued [member]; Revenue]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2024-01-01
-Paragraph 80
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_80_a&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2024-01-01
-Paragraph 106
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_106&doctype=Standard
-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 82
-Subparagraph a
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_a_ii&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of expenses arising from a group of insurance contracts issued, comprising incurred claims (excluding repayments of investment components), other incurred insurance service expenses, amortisation of insurance acquisition cash flows, changes that relate to past service and changes that relate to future service. [Refer: Insurance contracts issued [member]]

+ References

+ Details

Name:	ifrs-full_InsuranceServiceExpensesFromInsuranceContractsIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount comprising insurance revenue and insurance service expenses. [Refer: Insurance revenue; Insurance service expenses from insurance contracts issued; Income (expenses) from reinsurance contracts held, other than finance income (expenses)]

+ References

+ Details

Name:	ifrs-full_InsuranceServiceResult
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Insurances abstract.

+ References

No definition available.

+ Details

Name:	ihg_InsurancesAbstract
Namespace Prefix:	ihg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration