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v3.10.0.1

Tax - Current Tax - Additional Information (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of uncertain tax positions within current tax [line items] |  |
Uncertain tax positions included within current tax liability | $ 29,000,000 | $ 42,000,000
Maximum [member] |  |
Disclosure of uncertain tax positions within current tax [line items] |  |
Uncertain tax positions included within current tax liability | $ 8,000,000 | $ 8,000,000

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- Definition Disclosure of uncertain tax positions within current tax. + References No definition available. + Details
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Namespace Prefix: | ihg_
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Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |