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Other financial assets - Schedule of Movement in Provision for Impairment of Other Financial Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial assets that are either past due or impaired [abstract] |  |
At 1 January | $ (22) | $ (28)
Disposals | 4 | 6
At 31 December | $ (18) | $ (22)

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Impairment loss recognised in profit or loss, disposals financial assets. + References No definition available. + Details
Name: | ihg_ImpairmentLossRecognisedInProfitOrLossDisposalsFinancialAssets
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Provision for Impairment of other financial assets. + References No definition available. + Details
Name: | ihg_ProvisionForImpairmentOfOtherFinancialAssets
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant