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Auditor's Remuneration Paid to Ernst & Young LLP - Summary of Auditor's Remuneration Paid (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Auditor's remuneration [abstract] |  |  |
Audit fees for specific procedures performed in relation to the implementation of new accounting standards | $ 0.0 | $ 0.4 | $ 0.5

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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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