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Trade and other payables - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Statement [Line Items]
Guarantees of loans made to equity accounted investments	$ 31	$ 50
Guarantees of loans made to equity accounted investments gross	0	0
Top of range [member]
Statement [Line Items]
Guarantees of loans made to equity accounted investments	$ 21	$ 21

X

- Definition

The amount of guarantees of loans made to equity accounted investments.

+ References

No definition available.

+ Details

Name:	ihg_GuaranteesOfLoansMadeToEquityAccountedInvestments
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Guarantees of loans made to equity accounted investments gross.

+ References

No definition available.

+ Details

Name:	ihg_GuaranteesOfLoansMadeToEquityAccountedInvestmentsGross
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Statements [Line Items]

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: