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Other Financial Assets - Schedule of Movement in Provision for Impairment of Equity Securities (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Beginning balance | $ (18) | $ (22)
Disposals | 0 | 4
Ending balance | 0 | $ (18)
IFRS 9 [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Elimination of provision on adoption of IFRS 9 | $ 18 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfImpairmentLossAndReversalOfImpairmentLossLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Elimination of provision for impairment of equity securities on adoption of IFRS9. + References No definition available. + Details
Name: | ihg_EliminationOfProvisionForImpairmentOfEquitySecuritiesOnAdoptionOfIFRS9
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Impairment loss recognised in profit or loss, disposals equity securities. + References No definition available. + Details
Name: | ihg_ImpairmentLossRecognisedInProfitOrLossDisposalsEquitySecurities
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Provision for Impairment of equity securities + References No definition available. + Details
Name: | ihg_ProvisionForImpairmentOfEquitySecurities
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_EffectOfOverlayApproachReclassificationAxis=ihg_IFRS9Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |