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Related party disclosures - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of transactions between related parties [Line Items] |  |
Financial guarantee on bank loan |  | $ 12
Outstanding commitments made by entity, related party transactions | $ 10 | 10
Barclay associate [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Loan to and from material associate investment (offset in accordance with IAS32) | $ 237 | $ 237
Average interest rate on interest payable and receivable relating to loan to and from material associate investment | 2.70% | 0.90%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of outstanding commitments made by the entity in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2022-03-24 -Paragraph 18 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_18_b&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_OutstandingCommitmentsMadeByEntityRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financial guarantee on bank loan. + References No definition available. + Details
Name: | ihg_FinancialGuaranteeOnBankLoan
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Interest payable (receivable) equivalent average rate. + References No definition available. + Details
Name: | ihg_InterestPayableReceivableEquivalentAverageRate
Namespace Prefix: | ihg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Loans both payable and receivable offset net. + References No definition available. + Details
Name: | ihg_LoansBothPayableAndReceivableOffsetNet
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=ihg_BarclayAssociateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |