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Tax - Summary of Deferred Tax (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of income tax reconciliation [line items] |  |
Deferred tax assets liabilities net threshold | $ 10 | $ 10
Other Short-term Temporary Difference [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Deferred tax assets liabilities net threshold | $ 20 |

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- Definition Deferred tax assets liabilities net threshold. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of income tax reconciliation. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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