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Auditor's remuneration paid to Ernst & Young LLP - Additional Information (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Auditor's remuneration [abstract] |
Audit fees for specific procedures performed in relation to the implementation of new accounting standards | $ 0.5

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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 Audit fees for specific procedures performed in relation to the implementation of new accounting standards. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration