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Tax - Summary of Tabular Form of Taxes Paid Based on Geographical Area (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
United States [member] |  |  |
Disclosure In Tabular Form Of Taxes Paid Based On Geographical Area [Line Items] |  |  |
Income tax refunds in respect of earlier periods | $ 0 | $ 0 | $ 15

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- Definition Disclosure in tabular form of taxes paid based on geographical area. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Income tax refund received. + References No definition available. + Details
Name: | ihg_IncomeTaxRefundReceived
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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