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System Fund - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Employees | Dec. 31, 2016 USD ($) Employees | Dec. 31, 2015 USD ($) Employees
System fund [line items] |  |  |
Released future redemption liability |  |  | $ 156
Proceeds from System Fund | $ 8 | $ 65 | $ 42
System fund [member] |  |  |
System fund [line items] |  |  |
Employees related with payroll costs | Employees | 5,555 | 5,434 | 5,416

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- Definition The number of personnel employed by the entity at a date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfEmployees
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Adjustments for change in loyalty programme liability and system fund surplus. + References No definition available. + Details
Name: | ihg_AdjustmentsForChangeInLoyaltyProgrammeLiabilityAndSystemFundSurplus
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Redemption liabilities released. + References No definition available. + Details
Name: | ihg_RedemptionLiabilitiesReleased
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition System fund Line Items. + References No definition available. + Details
Name: | ihg_SystemFundLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ihg_SystemFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |