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v3.19.3.a.u2

Tax - Current Tax - Additional Information (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of uncertain tax positions within current tax [line items] |  |
Uncertain tax positions included within current tax liability | $ 33,000,000 | $ 29,000,000
Maximum [member] |  |
Disclosure of uncertain tax positions within current tax [line items] |  |
Uncertain tax positions included within current tax liability | $ 9,000,000 | $ 8,000,000

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

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

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |