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v3.19.3.a.u2

Related party disclosures - Additional Information (Detail) - Barclay associate [member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
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 | 2.10% | 2.70%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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 Interest payable (receivable) equivalent average rate. + References No definition available. + Details
Name: | ihg_InterestPayableReceivableEquivalentAverageRate
Namespace Prefix: | ihg_
Data Type: | num: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: |