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Tax - Current Tax - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of income tax reconciliation [Line Items] |  |
Uncertain tax positions included within current tax liability | $ 42 | $ 39
Uncertain tax positions offset from current tax receivable | 0 | 5
Maximum [member] |  |
Disclosure of income tax reconciliation [Line Items] |  |
Uncertain tax positions included within current tax liability | $ 8 | $ 8

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- Definition Line items represent reconciliation of changes in deferred tax liability (asset). + References No definition available. + Details
Name: | ihg_DisclosureOfIncomeTaxReconciliationLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Uncertain tax positions current liability. + References No definition available. + Details
Name: | ihg_UncertainTaxPositionsCurrentLiability
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Uncertain tax positions current receivable. + References No definition available. + Details
Name: | ihg_UncertainTaxPositionsCurrentReceivable
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |