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Events after the Reporting Period - Additional Information (Detail) $ in Millions | Feb. 12, 2019 USD ($)
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Major business combination [member] | Six Senses Hotels Resorts Spas [member] |
Disclosure of Events After Reporting Period [line items] |
Cash paid on acquisition | $ 300

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- Definition The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph f -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_f_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_CashTransferred
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
Name: | ihg_DisclosureOfEventsAfterReportingPeriodLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_MajorBusinessCombinationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=ihg_SixSensesHotelsResortsSpasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |