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Trade and other payables - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
UK Portfolio [member] |  |
Statement [Line Items] |  |
Rent payable | $ 29 | $ 65

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- Definition Amounts payable that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_OtherPayables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Statement [Line Items] + References No definition available. + Details
Name: | ihg_StatementLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_GeographicalAreasAxis=ihg_UkPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |