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Events after the Reporting Period - Additional Information (Detail) - Feb. 17, 2025 - Ruby Brand [member] - Major business combination [member] € in Millions, $ in Millions | EUR (€) | USD ($)
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Disclosure of Events After Reporting Period [line items] |  |
Total purchase consideration | € 110.5 | $ 116
Contingent consideration recognised as of acquisition date | € 181.0 | $ 190

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- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Total for all business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B64 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B64_f&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount, at acquisition date, of contingent consideration arrangements recognised as consideration transferred in a business combination. [Refer: Total for all business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B64 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B64_g_i&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of events after reporting period line items. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |