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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

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